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<title>Washington Formation</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Washington Formation</span></span>

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</style><table class="infobox vcard" style="width:24.5em;"><tbody><tr><th colspan="2" class="infobox-above fn org" style="border-style:solid; border-width: 2px 33px; border-color:rgb(240,64,40)">Washington Formation</th></tr><tr><td colspan="2" class="infobox-subheader"><a href="Geochronology" title="Geochronology">Stratigraphic range</a>: <a href="Permian" title="Permian">Permian</a></td></tr><tr><td colspan="2" class="infobox-image"><div class="infobox-caption"><a href="Bituminous_coal" title="Bituminous coal">Bituminous coal</a> (Washington Coal, Upper Pennsylvanian; <a href="Ohio" title="Ohio">Ohio</a>)</div></td></tr><tr><th scope="row" class="infobox-label">Type</th><td class="infobox-data"><a href="Formation_(stratigraphy)" class="mw-redirect" title="Formation (stratigraphy)">Formation</a></td></tr><tr><th scope="row" class="infobox-label">Unit of</th><td class="infobox-data"><a href="Dunkard_Group" title="Dunkard Group">Dunkard Group</a><sup id="cite_ref-berryhill_1-0" class="reference"><a href="#cite_note-berryhill-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label">Sub-units</th><td class="infobox-data">Upper Washington<br>

<p>Jollytown coal<br>

Hundred sandstone<br>

Upper Marietta<br>

Washington “A” coal<br>

Middle Washington<br>

Lower Washington<br>

Lower Marietta<br>

Washington (No. 12) coal<br>

Little Washington coal<br>

Mannington sandstone<br>

Waynesburg “A” coal<br>

Waynesburg Sandstone<br>

Elm Grove limestone<br>

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Cassville<br></td></tr><tr><th scope="row" class="infobox-label">Underlies</th><td class="infobox-data"><a href="Greene_Formation" title="Greene Formation">Greene Formation</a></td></tr><tr><th scope="row" class="infobox-label">Overlies</th><td class="infobox-data"><a href="Waynesburg_Formation" title="Waynesburg Formation">Waynesburg Formation</a></td></tr><tr><th colspan="2" class="infobox-header" style="border-style:solid; border-width: 2px 33px; border-color:rgb(240,64,40)">Lithology</th></tr><tr><th scope="row" class="infobox-label">Primary</th><td class="infobox-data"><a href="Limestone" title="Limestone">limestone</a>, sandstone, <a href="Coal" title="Coal">coal</a></td></tr><tr><th scope="row" class="infobox-label">Other</th><td class="infobox-data"><a href="Shale" title="Shale">shale</a></td></tr><tr><th colspan="2" class="infobox-header" style="border-style:solid; border-width: 2px 33px; border-color:rgb(240,64,40)">Location</th></tr><tr><th scope="row" class="infobox-label">Region</th><td class="infobox-data"><a href="Ohio" title="Ohio">Ohio</a> and <a href="West_Virginia" title="West Virginia">West Virginia</a></td></tr><tr><th scope="row" class="infobox-label">Country</th><td class="infobox-data"><a href="United_States" title="United States">United States</a></td></tr></tbody></table>

<p>The <b>Washington Formation</b> is a coal, sandstone, and limestone <a href="Formation_(geology)" class="mw-redirect" title="Formation (geology)">geologic formation</a> located in <a href="Ohio" title="Ohio">Ohio</a>, <a href="Pennsylvania" title="Pennsylvania">Pennsylvania</a> and <a href="West_Virginia" title="West Virginia">West Virginia</a>.<sup id="cite_ref-berryhill_1-1" class="reference"><a href="#cite_note-berryhill-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> It dates back to the Lower <a href="Permian" title="Permian">Permian</a> <a href="Period_(geology)" class="mw-redirect" title="Period (geology)">period</a>, with its base at or near the Permian/<a href="Carboniferous" title="Carboniferous">Carboniferous</a> boundary.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The Washington formation and the <a href="Dunkard_Group" title="Dunkard Group">Dunkard Group</a> as a whole was deposited at a time when the continents were in the process of forming the "Super Continent" <a href="Pangaea" title="Pangaea">Pangaea</a> as well as a gradual drop in sea levels.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The result during this period was coals being thinner and impure with high ash content. The limestones found with in the formation are exclusively freshwater deposits.

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFBerryhillSwanson1962" class="citation journal cs1 cs1-prop-long-vol">Berryhill, Henry L. Jr.; Swanson, Vernon E. (1962). <a rel="nofollow" class="external text" href="https://pubs.usgs.gov/pp/0450c/report.pdf">"Geological Survey research 1962; Short papers in geology and hydrology"</a> <span class="cs1-format">(PDF)</span>. <i>U.S. Geological Survey Professional Paper</i>. 450-C: <span class="nowrap">43–</span>46<span class="reference-accessdate">. Retrieved <span class="nowrap">30 June</span> 2018</span>.</cite></span>

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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite id="CITEREFWayne_Martin,_Bernard_Henniger1965" class="citation journal cs1">Wayne Martin, Bernard Henniger (1965). <span class="id-lock-subscription" title="Paid subscription required"><a rel="nofollow" class="external text" href="https://dx.doi.org/10.1306/a66335b4-16c0-11d7-8645000102c1865d">"The Hockingport and Waynesburg Sandstones (Pennsylvanian and Permian) of the Dunkard Group: ABSTRACT"</a></span>. <i>AAPG Bulletin</i>. <b>49</b>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1306%2Fa66335b4-16c0-11d7-8645000102c1865d">10.1306/a66335b4-16c0-11d7-8645000102c1865d</a></span>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0149-1423">0149-1423</a>.</cite></span>

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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFM._A._Rendina,_Wayne_D._Martin1985" class="citation journal cs1">M. A. Rendina, Wayne D. Martin (1985). <span class="id-lock-subscription" title="Paid subscription required"><a rel="nofollow" class="external text" href="https://dx.doi.org/10.1306/94885417-1704-11d7-8645000102c1865d">"Provenance of Selected Sandstones and Mud Rocks of Dunkard Group (Upper Pennsylvanian-Permian) in Ohio, West Virginia, and Pennsylvania: ABSTRACT"</a></span>. <i>AAPG Bulletin</i>. <b>69</b>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1306%2F94885417-1704-11d7-8645000102c1865d">10.1306/94885417-1704-11d7-8645000102c1865d</a></span>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0149-1423">0149-1423</a>.</cite></span>

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<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite id="CITEREFHaqSchutter2008" class="citation journal cs1">Haq, Bilal U.; Schutter, Stephen R. (2008-10-03). <span class="id-lock-subscription" title="Paid subscription required"><a rel="nofollow" class="external text" href="https://dx.doi.org/10.1126/science.1161648">"A Chronology of Paleozoic Sea-Level Changes"</a></span>. <i>Science</i>. <b>322</b> (5898): <span class="nowrap">64–</span>68. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1126%2Fscience.1161648">10.1126/science.1161648</a>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0036-8075">0036-8075</a>.</cite></span>

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</style><div id="Chronostratigraphy_of_Ohio144" style="font-size:114%;margin:0 4em"><a href="Chronostratigraphy" title="Chronostratigraphy">Chronostratigraphy</a> of <a href="Ohio" title="Ohio">Ohio</a></div></th></tr><tr><th scope="row" class="navbox-group" style="background:;;width:2em;background:rgb(154,217,221);text-align:center;"><a href="Phanerozoic" title="Phanerozoic"><span class="smallcaps">Ph</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(153,192,141);text-align:center;"><a href="Paleozoic" title="Paleozoic"><span class="smallcaps">Pz</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(240,64,40);text-align:center;"><a href="Permian" title="Permian">P</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(239,88,69);text-align:center;"><a href="Cisuralian" title="Cisuralian">Cisuralian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Dunkard_Group" title="Dunkard Group">Dunkard Group</a></dt>

<dd><a href="Greene_Formation" title="Greene Formation">Greene Formation</a></dd>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(103,165,153);text-align:center;"><a href="Carboniferous" title="Carboniferous">C</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(126,188,198);text-align:center;"><a href="Pennsylvanian_(geology)" title="Pennsylvanian (geology)">⁋</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,212,199);text-align:center;"><a href="Gzhelian" title="Gzhelian">Gzhelian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Dunkard_Group" title="Dunkard Group">Dunkard Group</a></dt>

<dd><a href="Waynesburg_Formation" title="Waynesburg Formation">Waynesburg Formation</a></dd></dl>

<dl><dt><a href="Monongahela_Group" class="mw-redirect" title="Monongahela Group">Monongahela Group</a></dt>

<dd>Uniontown Formation</dd>

<dd><a href="Pittsburgh_Formation" class="mw-redirect" title="Pittsburgh Formation">Pittsburgh Formation</a></dd></dl>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(191,208,197);text-align:center;"><a href="Kasimovian" title="Kasimovian">Kasimovian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Conemaugh_Group" title="Conemaugh Group">Conemaugh Group</a></dt>

<dd><a href="Casselman_Formation" title="Casselman Formation">Casselman Formation</a></dd>

<dd><a href="Glenshaw_Formation" title="Glenshaw Formation">Glenshaw Formation</a></dd></dl>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(179,203,185);text-align:center;"><a href="Moscovian_(Carboniferous)" class="mw-redirect" title="Moscovian (Carboniferous)">Moscovian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Allegheny_Group" title="Allegheny Group">Allegheny Group</a></dt>

<dt><a href="Pottsville_Group" class="mw-redirect" title="Pottsville Group">Pottsville Group</a></dt></dl>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(103,143,102);text-align:center;"><a href="Mississippian_epoch" class="mw-redirect" title="Mississippian epoch">M</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(166,185,108);text-align:center;"><a href="Vis%C3%A9an" title="Viséan">Viséan</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Maxville_Limestone" title="Maxville Limestone">Maxville Limestone</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(140,176,108);text-align:center;"><a href="Tournaisian" title="Tournaisian">Tournaisian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"><a href="Cuyahoga_Formation" title="Cuyahoga Formation">Cuyahoga Formation</a>

<p><a href="Logan_Formation" title="Logan Formation">Logan Formation</a>

</p>

<ul><li><a href="Sunbury_Shale" title="Sunbury Shale">Sunbury Shale</a></li></ul></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Coldwater_Shale" title="Coldwater Shale">Coldwater Shale</a></li>

<li><a href="Rushville_Shale" title="Rushville Shale">Rushville Shale</a></li>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(203,140,55);text-align:center;"><a href="Devonian" title="Devonian">D</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(241,225,157);text-align:center;"><a href="Upper_Devonian" class="mw-redirect" title="Upper Devonian">Upper</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(242,237,179);text-align:center;"><a href="Famennian" title="Famennian">Famennian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Bedford_Shale" title="Bedford Shale">Bedford Shale</a></li>

<li><a href="Berea_Sandstone" title="Berea Sandstone">Berea Sandstone</a></li>

<li><a href="Cussewago_Sandstone" title="Cussewago Sandstone">Cussewago Sandstone</a></li></ul>

<dl><dt><a href="Ohio_Shale" title="Ohio Shale">Ohio Shale</a></dt>

<dd><a href="Cleveland_Shale" title="Cleveland Shale">Cleveland Shale</a></dd>

<dd><a href="Chagrin_Shale" title="Chagrin Shale">Chagrin Shale</a></dd>

<dd>Huron Shale</dd></dl>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(242,237,173);text-align:center;"><a href="Frasnian" title="Frasnian">Frasnian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Burket_Shale" title="Burket Shale">Burket Shale</a></li>

<li><a href="Olentangy_Shale" title="Olentangy Shale">Olentangy Shale</a> (upper)</li></ul>

</div></td></tr></tbody></table><div>

<ul><li><a href="Antrim_Shale" title="Antrim Shale">Antrim Shale</a></li>

<li><a href="Java_Formation" title="Java Formation">Java Formation</a></li></ul>

<dl><dt><a href="West_Falls_Group" title="West Falls Group">West Falls Group</a></dt>

<dd>Angola Shale</dd>

<dd><a href="Rhinestreet_Shale" class="mw-redirect" title="Rhinestreet Shale">Rhinestreet Shale</a></dd></dl></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(241,200,104);text-align:center;"><a href="Middle_Devonian" title="Middle Devonian">Middle</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(241,225,133);text-align:center;"><a href="Givetian" title="Givetian">Givetian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Tully_Formation" title="Tully Formation">Tully Formation</a></li>

<li><a href="Mahantango_Formation" title="Mahantango Formation">Mahantango Formation</a></li>

<li><a href="Olentangy_Shale" title="Olentangy Shale">Olentangy Shale</a> (lower)</li>

<li><a href="Plum_Brook_Shale" title="Plum Brook Shale">Plum Brook Shale</a></li>

<li><a href="Prout_Limestone" title="Prout Limestone">Prout Limestone</a></li>

<li><a href="Silica_Formation" title="Silica Formation">Silica Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(241,213,118);text-align:center;"><a href="Eifelian" title="Eifelian">Eifelian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Marcellus_Shale" class="mw-redirect" title="Marcellus Shale">Marcellus Shale</a></li></ul>

<ul><li><a href="Amherstburg_Dolomite" class="mw-redirect" title="Amherstburg Dolomite">Amherstburg Dolomite</a></li>

<li><a href="Columbus_Limestone" title="Columbus Limestone">Columbus Limestone</a>/<a href="Onondaga_Limestone" title="Onondaga Limestone">Onondaga Limestone</a></li>

<li><a href="Delaware_Limestone" title="Delaware Limestone">Delaware Limestone</a></li>

<li><a href="Detroit_River_Group" title="Detroit River Group">Detroit River Group</a></li>

<li><a href="Hillsboro_Sandstone" title="Hillsboro Sandstone">Hillsboro Sandstone</a></li></ul>

</div></td></tr></tbody></table><div>

<ul><li><a href="Dundee_Formation" class="mw-redirect" title="Dundee Formation">Dundee Formation</a></li>

<li><a href="Lucas_Dolomite" class="mw-redirect" title="Lucas Dolomite">Lucas Dolomite</a></li>

<li><a href="Tenmile_Creek_Dolomite" class="mw-redirect" title="Tenmile Creek Dolomite">Tenmile Creek Dolomite</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(229,172,77);text-align:center;"><a href="Lower_Devonian" class="mw-redirect" title="Lower Devonian">Lower</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(229,208,117);text-align:center;"><a href="Emsian" title="Emsian">Emsian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Amherstburg_Dolomite" class="mw-redirect" title="Amherstburg Dolomite">Amherstburg Dolomite</a></li>

<li><a href="Detroit_River_Group" title="Detroit River Group">Detroit River Group</a></li>

<li><a href="Hillsboro_Sandstone" title="Hillsboro Sandstone">Hillsboro Sandstone</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(229,183,90);text-align:center;"><a href="Lochkovian" title="Lochkovian">Lochkovian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Holland_Quarry_Shale" title="Holland Quarry Shale">Holland Quarry Shale</a></li></ul>

</div></td></tr></tbody></table><div>

<ul><li>Bass Islands Dolomite</li>

<li><a href="Bois_Blanc_Formation" title="Bois Blanc Formation">Bois Blanc Formation</a></li>

<li><a href="Helderberg_Group" class="mw-redirect" title="Helderberg Group">Helderberg Group</a></li>

<li><a href="Oriskany_Sandstone" class="mw-redirect" title="Oriskany Sandstone">Oriskany Sandstone</a></li>

<li><a href="Sylvania_Sandstone" title="Sylvania Sandstone">Sylvania Sandstone</a></li></ul></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(179,225,182);text-align:center;"><a href="Silurian" title="Silurian">S</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(230,245,225);text-align:center;"><a href="Pridoli_epoch" class="mw-redirect" title="Pridoli epoch">Pridoli</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Bertie_Formation" title="Bertie Formation">Bertie Formation</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(191,230,207);text-align:center;"><a href="Ludlow_epoch" class="mw-redirect" title="Ludlow epoch">Ludlow</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(217,240,223);text-align:center;"><a href="Ludfordian" title="Ludfordian">Ludfordian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Salina_Group" title="Salina Group">Salina Group</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,236,221);text-align:center;"><a href="Gorstian" title="Gorstian">Gorstian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Salina_Group" title="Salina Group">Salina Group</a></li>

<li><a href="Guelph_Dolomite" class="mw-redirect" title="Guelph Dolomite">Guelph Dolomite</a></li></ul>

</div></td></tr></tbody></table><div>

<ul><li><a href="Salina_Group" title="Salina Group">Salina Group</a></li>

<li><a href="Greenfield_Dolomite" class="mw-redirect" title="Greenfield Dolomite">Greenfield Dolomite</a></li>

<li><a href="Tymochtee_Dolomite" title="Tymochtee Dolomite">Tymochtee Dolomite</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(179,225,194);text-align:center;"><a href="Wenlock_(Silurian)" class="mw-redirect" title="Wenlock (Silurian)">Wenlock</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,235,209);text-align:center;"><a href="Homerian" title="Homerian">Homerian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Lockport_Group" title="Lockport Group">Lockport Group</a></dt>

<dd><a href="Gasport_Dolomite" class="mw-redirect" title="Gasport Dolomite">Gasport Dolomite</a></dd>

<dd><a href="Guelph_Dolomite" class="mw-redirect" title="Guelph Dolomite">Guelph Dolomite</a></dd>

<dd><a href="Goat_Island_Dolomite" class="mw-redirect" title="Goat Island Dolomite">Goat Island Dolomite</a></dd></dl>

</div></td></tr></tbody></table><div>

<ul><li><a href="Bisher_Formation" title="Bisher Formation">Bisher Formation</a></li>

<li><a href="Cedarville_Dolomite" title="Cedarville Dolomite">Cedarville Dolomite</a></li>

<li><a href="Dayton_Formation" title="Dayton Formation">Dayton Formation</a></li>

<li><a href="Estill_Shale" title="Estill Shale">Estill Shale</a></li>

<li><a href="Euphemia_Dolomite" title="Euphemia Dolomite">Euphemia Dolomite</a></li>

<li><a href="Laurel_Limestone" class="mw-redirect" title="Laurel Limestone">Laurel Limestone</a></li>

<li><a href="Lilley_Formation" title="Lilley Formation">Lilley Formation</a></li>

<li><a href="Massie_Shale" title="Massie Shale">Massie Shale</a></li>

<li><a href="Osgood_Shale" class="mw-redirect" title="Osgood Shale">Osgood Shale</a></li>

<li><a href="Peebles_Dolomite" title="Peebles Dolomite">Peebles Dolomite</a></li>

<li><a href="Rochester_Shale" class="mw-redirect" title="Rochester Shale">Rochester Shale</a></li>

<li><a href="Springfield_Dolomite" title="Springfield Dolomite">Springfield Dolomite</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(153,215,179);text-align:center;"><a href="Llandovery_epoch" class="mw-redirect" title="Llandovery epoch">Llandovery</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Brassfield_Formation" title="Brassfield Formation">Brassfield Formation</a></li>

<li><a href="Cabot_Head_Shale" class="mw-redirect" title="Cabot Head Shale">Cabot Head Shale</a></li>

<li><a href="Clinton_Formation" class="mw-redirect" title="Clinton Formation">Clinton Formation</a></li>

<li><a href="Drowning_Creek_Formation" title="Drowning Creek Formation">Drowning Creek Formation</a></li>

<li><a href="Manitoulin_Dolomite" title="Manitoulin Dolomite">Manitoulin Dolomite</a></li>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(0,146,112);text-align:center;"><a href="Ordovician" title="Ordovician">O</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(127,202,147);text-align:center;"><a href="Upper_Ordovician" class="mw-redirect" title="Upper Ordovician">Upper</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Arnheim_Formation" title="Arnheim Formation">Arnheim Formation</a></li>

<li><a href="Cincinnati_Group" title="Cincinnati Group">Cincinnati Group</a></li>

<li><a href="Drakes_Formation" class="mw-redirect" title="Drakes Formation">Drakes Formation</a></li>

<li><a href="Fairview_Formation" title="Fairview Formation">Fairview Formation</a></li>

<li><a href="Grant_Lake_Formation" title="Grant Lake Formation">Grant Lake Formation</a></li>

<li><a href="Kope_Formation" title="Kope Formation">Kope Formation</a></li>

<li><a href="Liberty_Formation" class="mw-redirect" title="Liberty Formation">Liberty Formation</a></li>

<li><a href="Miamitown_Shale" title="Miamitown Shale">Miamitown Shale</a></li>

<li><a href="Queenston_Shale" class="mw-redirect" title="Queenston Shale">Queenston Shale</a></li>

<li><a href="Saluda_Formation" title="Saluda Formation">Saluda Formation</a></li>

<li><a href="Trenton_Limestone" class="mw-redirect" title="Trenton Limestone">Trenton Limestone</a></li>

<li><a href="Waynesville_Formation" class="mw-redirect" title="Waynesville Formation">Waynesville Formation</a></li>

<li><a href="Whitewater_Formation" class="mw-redirect" title="Whitewater Formation">Whitewater Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(77,180,126);text-align:center;"><a href="Middle_Ordovician" class="mw-redirect" title="Middle Ordovician">Middle</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Black_River_Group" title="Black River Group">Black River Group</a></li>

<li><a href="Lexington_Limestone" title="Lexington Limestone">Lexington Limestone</a></li>

<li><a href="Point_Pleasant_Formation" title="Point Pleasant Formation">Point Pleasant Formation</a></li>

<li><a href="Trenton_Limestone" class="mw-redirect" title="Trenton Limestone">Trenton Limestone</a></li>

<li><a href="Wells_Creek_Formation" class="mw-redirect" title="Wells Creek Formation">Wells Creek Formation</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(127,160,86);text-align:center;"><a href="Cambrian" title="Cambrian">Є</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(179,224,149);text-align:center;"><a href="Furongian" title="Furongian">Furongian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Conasauga_Formation" class="mw-redirect" title="Conasauga Formation">Conasauga Formation</a></li>

<li><a href="Eau_Claire_Formation" title="Eau Claire Formation">Eau Claire Formation</a></li>

<li><a href="Kerbel_Formation" title="Kerbel Formation">Kerbel Formation</a></li>

<li><a href="Knox_Dolomite" title="Knox Dolomite">Knox Dolomite</a></li>

<li><a href="Rome_Formation" title="Rome Formation">Rome Formation</a></li></ul>

</div></td></tr></tbody></table><div>

<ul><li><a href="Mt._Simon_Sandstone" class="mw-redirect" title="Mt. Simon Sandstone">Mt. Simon Sandstone</a></li></ul></div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="background:;;width:2em;background:rgb(247,67,112);text-align:center;"><a href="Precambrian" title="Precambrian">pЄ</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(247,53,99);text-align:center;"><a href="Proterozoic" title="Proterozoic">♇</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(254,179,66);text-align:center;"><a href="Neoproterozoic" title="Neoproterozoic">Z</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Swift_Run_Formation" title="Swift Run Formation">Swift Run Formation</a></li>

</div></td></tr></tbody></table><div>

<ul><li><a href="Middle_Run_Formation" title="Middle Run Formation">Middle Run Formation</a></li></ul></div></td></tr></tbody></table><div></div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Chronostratigraphy_of_Pennsylvania152" style="padding:3px"><table class="nowraplinks mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="background:;"><div id="Chronostratigraphy_of_Pennsylvania152" style="font-size:114%;margin:0 4em"><a href="Chronostratigraphy" title="Chronostratigraphy">Chronostratigraphy</a> of <a href="Pennsylvania" title="Pennsylvania">Pennsylvania</a></div></th></tr><tr><th scope="row" class="navbox-group" style="background:;;width:2em;background:rgb(154,217,221);text-align:center;"><a href="Phanerozoic" title="Phanerozoic"><span class="smallcaps">Ph</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(153,192,141);text-align:center;"><a href="Paleozoic" title="Paleozoic"><span class="smallcaps">Pz</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(240,64,40);text-align:center;"><a href="Permian" title="Permian">P</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(239,88,69);text-align:center;"><a href="Cisuralian" title="Cisuralian">Cisuralian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Dunkard_Group" title="Dunkard Group">Dunkard Group</a></dt>

<dt><br> <a href="Greene_Formation" title="Greene Formation">Greene Formation</a></dt>

<ul><li><dl><dd>Windy Gap Limestone</dd>

<dd>Windy Gap Coal</dd>

<dd>Gilmore Limestone</dd>

<dd>Nineveh Sandstone</dd>

<dd>Nineveh Coal</dd>

<dd>Nineveh Limestone</dd>

<dd>Fish Creek Sandstone</dd>

<dd>Claysville Limestone</dd>

<dd>Dunkard Coal</dd>

<dd>Prosperity Limestone</dd>

<dd>Tenmile Coal</dd>

<dd>Donley Limestone</dd>

<dd>Upper Washington Coal</dd>

<dd>Rockport Member</dd></dl></li></ul>

<ul><li><dl><dd>Upper Washington Limestone Member</dd>

<dd>Jollytown Limestone Member</dd>

<dd>Jollytown Coal</dd>

<dd>Middle Washington Limestone Member</dd>

<dd>Washington Coal</dd>

<dd>Lower Washington Limestone Member</dd></dl></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(103,165,153);text-align:center;"><a href="Carboniferous" title="Carboniferous">C</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(126,188,198);text-align:center;"><a href="Pennsylvanian_(geology)" title="Pennsylvanian (geology)">⁋</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,212,199);text-align:center;"><a href="Gzhelian" title="Gzhelian">Gzhelian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Dunkard_Group" title="Dunkard Group">Dunkard Group</a></dt>

<dt><br><a href="Waynesburg_Formation" title="Waynesburg Formation">Waynesburg Formation</a></dt>

<ul><li><dl><dd>Upper Waynesburg Member</dd>

<dd>Little Washington Coal</dd>

<dd>Waynesburg“B” coal</dd>

<dd>Middle Waynesburg Member</dd>

<dd>Waynesburg“A” coal</dd>

<dd>Lower Waynesburg Member</dd></dl></li></ul>

<dl><dt><a href="Monongahela_Group" class="mw-redirect" title="Monongahela Group">Monongahela Group</a></dt>

<dt><br>Uniontown Formation</dt>

<ul><li><dl><dd>Waynesburg coal "No. 11 Coal"</dd>

<dd>Gilboy Sandstone Member</dd>

<dd>Little Waynesburg Coal</dd>

<dd>Waynesburg Limestone Member</dd>

<dd>Uniontown Sanstone Member</dd>

<dd>Annabelle Shale Member</dd>

<dd>Uniontown Coal "No. 10 Coal"</dd>

<dd>Uniontown Limestone Member "Great Lime"</dd>

<dd>Fulton Shale Member</dd></dl></li></ul>

<dl><dt><br> <a href="Pittsburgh_Formation" class="mw-redirect" title="Pittsburgh Formation">Pittsburgh Formation</a></dt>

<ul><li><dl><dd>Benwood Limestone</dd>

<dd>Upper Sewickley Coal</dd>

<dd>Upper Sewickley Sandstone Member</dd>

<dd>Sewickley Coal "Meigis Creek" "No. 9 Coal"</dd>

<dd>Lower Sewickley Sandstone Member</dd>

<dd>Sewickley Limestone Member</dd>

<dd>Cedarville Sanstone Member</dd>

<dd>Redstone-Pomeroy coal "No 8a. Coal"</dd>

<dd>Westone Sanstone Member</dd>

<dd><a href="Pittsburgh_coal_seam" title="Pittsburgh coal seam">Pittsburgh coal seam</a> "No. 8 Coal"</dd></dl></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(191,208,197);text-align:center;"><a href="Kasimovian" title="Kasimovian">Kasimovian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Conemaugh_Group" title="Conemaugh Group">Conemaugh Group</a></dt>

<dt><br><a href="Casselman_Formation" title="Casselman Formation">Casselman Formation</a></dt>

<ul><li><dl><dd>Upper Pittsburgh Limestone Member</dd>

<dd>Little Pittsburgh coal seam</dd>

<dd>Lower Pittsburgh Limestone Member</dd>

<dd>Connellsville Member</dd>

<dd>Morgantown Member</dd>

<dd>Birmingham Member</dd></dl></li></ul>

<dl><dt><a href="Glenshaw_Formation" title="Glenshaw Formation">Glenshaw Formation</a></dt>

<ul><li><dl><dd><a href="Ames_Limestone" title="Ames Limestone">Ames Limestone</a></dd>

<dd>Pittsburgh Red Beds</dd>

<dd>Upper Bakerstown coal</dd>

<dd>Upper Saltsburg Sandstone Member</dd>

<dd>Woods Run Limestone Member</dd>

<dd>Lower Saltsburg Sandstone Member</dd>

<dd>Pine Creek Limestone Member</dd>

<dd>Buffalo Sandstone Member</dd>

<dd>Bush Creek Limestone Member</dd></dl></li></ul>

<dl><dt><a href="Mahoning_Formation" title="Mahoning Formation">Mahoning Formation</a></dt>

<ul><li><dl><dd>Bush Creek Coal</dd>

<dd>Upper Mahoning Sandstone Member</dd>

<dd>Mahoning Coal "No. 7a Coal"</dd>

<dd>Lower Mahoning Sandstone Member</dd></dl></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(179,203,185);text-align:center;"><a href="Moscovian_(Carboniferous)" class="mw-redirect" title="Moscovian (Carboniferous)">Moscovian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Allegheny_Group" title="Allegheny Group">Allegheny Group</a></dt>

<dt><br> <a href="Freeport_Formation" title="Freeport Formation">Freeport Formation</a></dt>

<ul><li><dl><dd>Upper Freeport Coal "No. 7 Coal"</dd>

<dd>Upper Freeport Limestone Member</dd>

<dd>Butler Sandstone Member</dd>

<dd>Lower Freeport Coal "No. 6a Coal"</dd>

<dd>Upper Freeport Limestone Member</dd>

<dd>Freeport Sandstone Member</dd></dl></li></ul>

<dl><dt>Kittanning Formation</dt>

<ul><li><dl><dd>Upper Kittanning Coal</dd>

<dd>Johnstone Limestone Member</dd>

<dd>Middle Kittanning Coal "No. 6 Coal"</dd>

<dd>Lower Kittanning Coal "No. 5 Coal"</dd>

<dd>Kittanning Sandstone Member</dd></dl></li></ul>

<dl><dt>Clarian Formation</dt>

<ul><li><dl><dd>Clarian Coal "No. 4a Coal"</dd>

<dd>Vanport Limestone Member</dd>

<dd>Brookville Coal "No. 4 Coal"</dd>

<dd>Brookville Member</dd></dl></li></ul>

<dl><dt><a href="Pottsville_Group" class="mw-redirect" title="Pottsville Group">Pottsville Group</a></dt>

<dt><br> Beaver River Formation</dt>

<ul><li><dl><dd>Homewood Sandstone Member "1st Salt Sand"</dd></dl></li></ul>

<dl><dt><a href="Mercer_Formation" title="Mercer Formation">Mercer Formation</a></dt>

<ul><li><dl><dd>Upper Mercer Limestone Member</dd>

<dd>Upper Mercer Coal</dd>

<dd>Lower Mercer Limestone Member</dd>

<dd>Lower Mercer Coal "No. 3 Coal"</dd></dl></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(153,194,181);text-align:center;"><a href="Bashkirian" title="Bashkirian">Bashkirian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Pottsville_Group" class="mw-redirect" title="Pottsville Group">Pottsville Group</a></dt>

<dt><br> Connoquenessing Formation</dt>

<ul><li><dl><dd>Upper Connoquenessing Sandstone Member "2nd Salt Sand"</dd>

<dd>Quakertown Coal "No. 2 Coal"</dd>

<dd>Quakertown Fire Clay</dd>

<dd>Quakertown Shale</dd>

<dd>Lower Connoquenessing Sandstone Member</dd></dl></li></ul>

<dl><dt>Sharon Formation</dt>

<ul><li><dl><dd>Sharon Shale Member</dd>

<dd>Sharon Coal "No. 1 Coal"</dd>

<dd>Sharon Sandstone</dd></dl></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(103,143,102);text-align:center;"><a href="Mississippian_epoch" class="mw-redirect" title="Mississippian epoch">M</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(191,194,107);text-align:center;"><a href="Serpukhovian" title="Serpukhovian">Serpukhovian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li>Shenango Formation</li></ul>

<dl><dt><a href="Mauch_Chunk_Group" title="Mauch Chunk Group">Mauch Chunk Group</a></dt>

<ul><li><dl><dd><a href="Bluestone_Formation" title="Bluestone Formation">Bluestone Formation</a></dd>

<dd>Princeton Formation</dd>

<dd><a href="Hinton_Formation" title="Hinton Formation">Hinton Formation</a></dd>

<dd>Maxton Sandstone</dd>

<dd><a href="Bluefield_Formation" title="Bluefield Formation">Bluefield Formation</a> "Little Lime"</dd></dl></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(166,185,108);text-align:center;"><a href="Vis%C3%A9an" title="Viséan">Viséan</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Greenbrier_Limestone" class="mw-redirect" title="Greenbrier Limestone">Greenbrier Limestone</a> "Big Lime" Loyalhanna Formation</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(140,176,108);text-align:center;"><a href="Tournaisian" title="Tournaisian">Tournaisian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Cuyahoga_Formation" title="Cuyahoga Formation">Cuyahoga Formation</a></li></ul>

<dl><dt><a href="Pocono_Group" class="mw-redirect" title="Pocono Group">Pocono Group</a></dt>

<ul><li><dl><dd><a href="Burgoon_Formation" class="mw-redirect" title="Burgoon Formation">Burgoon Formation</a> "Big Injun Sandstone"</dd>

<dd><a href="Sunbury_Shale" title="Sunbury Shale">Sunbury Shale</a></dd>

<dd><a href="Berea_Sandstone" title="Berea Sandstone">Berea Sandstone</a></dd>

<dd><a href="Bedford_Shale" title="Bedford Shale">Bedford Shale</a></dd></dl></li>

<li><a href="Rockwell_Formation" title="Rockwell Formation">Rockwell Formation</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(203,140,55);text-align:center;"><a href="Devonian" title="Devonian">D</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(241,225,157);text-align:center;"><a href="Upper_Devonian" class="mw-redirect" title="Upper Devonian">Upper</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(242,237,179);text-align:center;"><a href="Famennian" title="Famennian">Famennian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Brallier_Formation" title="Brallier Formation">Brallier Formation</a></li>

<li><a href="Lock_Haven_Formation" title="Lock Haven Formation">Lock Haven Formation</a></li>

<li>Riceville Formation</li>

<li><a href="Oswayo_Formation" title="Oswayo Formation">Oswayo Formation</a></li>

<li><a href="Bedford_Shale" title="Bedford Shale">Bedford Shale</a></li>

<li><a href="Cussewago_Formation" title="Cussewago Formation">Cussewago Formation</a></li></ul>

<dl><dt>Venango Group</dt>

<ul><li><dl><dd>Gantz, Hundred-foot sand, Fifty-foot sand, Thirty-foot sand, Nineveh-Snee, Gordon Stray, Fourth Sand, Fifth Sand, Bayard Sand, Elizabeth Sand, Sweet Richard,</dd>

<dd>Chadakoin Formation, First Warren</dd></dl></li></ul>

<dl><dt>Bradford Group</dt>

<ul><li><dl><dd>Upper Warren, Lower Warren, Speechely Stray, Speechely, Balltown A, Balltown B, Balltown C, Sheffield, First Bradford, Second Bradford, Third Bradford, Kane</dd></dl></li></ul>

<dl><dt>Elk Group</dt>

<dl><dt><a href="Ohio_Shale" title="Ohio Shale">Ohio Shale</a></dt>

<ul><li><dl><dd><a href="Cleveland_Shale" title="Cleveland Shale">Cleveland Shale</a></dd>

<dd>Chagrin Formation</dd>

<dd>Huron Shale</dd></dl></li></ul>

<ul><li><a href="Java_Formation" title="Java Formation">Java Formation</a></li>

<li><a href="Rockwell_Formation" title="Rockwell Formation">Rockwell Formation</a></li>

<li><a href="Huntley_Mountain_Formation" title="Huntley Mountain Formation">Huntley Mountain Formation</a></li>

<li><a href="Hampshire_Formation" class="mw-redirect" title="Hampshire Formation">Hampshire Formation</a></li></ul>

<dl><dt><a href="Catskill_Group" class="mw-redirect" title="Catskill Group">Catskill Group</a></dt>

<ul><li><dl><dd>Duncannon Member</dd>

<dd>Sherman Creek Member</dd>

<dd>Irish Valley Member</dd></dl></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(242,237,173);text-align:center;"><a href="Frasnian" title="Frasnian">Frasnian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Catskill_Group" class="mw-redirect" title="Catskill Group">Catskill Group</a></dt>

<ul><li><dl><dd>Sherman Creek Member</dd>

<dd>Irish Valley Member</dd></dl></li></ul>

<ul><li><a href="Brallier_Formation" title="Brallier Formation">Brallier Formation</a></li>

<li><a href="Lock_Haven_Formation" title="Lock Haven Formation">Lock Haven Formation</a></li></ul>

<dl><dt><a href="West_Falls_Group" title="West Falls Group">West Falls Group</a></dt>

<ul><li><dl><dd><a href="Angola_Formation" class="mw-redirect" title="Angola Formation">Angola Formation</a></dd>

<dd><a href="Rhinestreet_Shale" class="mw-redirect" title="Rhinestreet Shale">Rhinestreet Shale</a></dd></dl></li></ul>

<dl><dt><a href="Sonyea_Group" class="mw-redirect" title="Sonyea Group">Sonyea Group</a></dt>

<ul><li><dl><dd><a href="Cashaqua_Shale" title="Cashaqua Shale">Cashaqua Shale</a></dd>

<dd><a href="Middlesex_Shale" class="mw-redirect" title="Middlesex Shale">Middlesex Shale</a></dd></dl></li></ul>

<dl><dt><a href="Genesee_Group" class="mw-redirect" title="Genesee Group">Genesee Group</a> / <a href="Harrell_Shale" title="Harrell Shale">Harrell Shale</a></dt>

<ul><li><dl><dd><a href="West_River_Shale" class="mw-redirect" title="West River Shale">West River Shale</a></dd>

<dd><a href="Penn_Yan_Formation" class="mw-redirect" title="Penn Yan Formation">Penn Yan Formation</a></dd>

<dd><a href="Burket_Shale" title="Burket Shale">Burket Shale</a> / <a href="Geneseo_Shale" class="mw-redirect" title="Geneseo Shale">Geneseo Shale</a></dd></dl></li></ul>

</div></td></tr></tbody></table><div>

<ul><li>Knapp Conglomerate</li>

<li>Murrysville Sandstone</li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(241,200,104);text-align:center;"><a href="Middle_Devonian" title="Middle Devonian">Middle</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(241,225,133);text-align:center;"><a href="Givetian" title="Givetian">Givetian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"><a href="Tully_Limestone" class="mw-redirect" title="Tully Limestone">Tully Limestone</a>

<dl><dt><a href="Hamilton_Group" title="Hamilton Group">Hamilton Group</a></dt>

<ul><li><dl><dd><a href="Moscow_Formation" title="Moscow Formation">Moscow Formation</a></dd>

<dd><a href="Ludlow_Formation" title="Ludlow Formation">Ludlow Formation</a></dd>

<dd>Skaneateles Formation</dd>

<dd>Tichnor Formation</dd></dl></li>

<li><a href="Mahantango_Formation" title="Mahantango Formation">Mahantango Formation</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(241,213,118);text-align:center;"><a href="Eifelian" title="Eifelian">Eifelian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Hamilton_Group" title="Hamilton Group">Hamilton Group</a></dt>

<ul><li><dl><dd><a href="Marcellus_Formation" title="Marcellus Formation">Marcellus Formation</a></dd></dl></li></ul>

<dl><dt><a href="Onondaga_Limestone" title="Onondaga Limestone">Onondaga Limestone</a></dt></dl>

<ul><li><dl><dd>Seneca</dd>

<dd>Moorehouse</dd>

<dd>Nedrow</dd>

<dd>Edgecliff</dd></dl></li></ul>

<dl><dt><ul><li><a href="Huntersville_Chert" title="Huntersville Chert">Huntersville Chert</a></li></ul></dt></dl>

<ul><li><dl><dd>Bobs Ridge Sandstone Member</dd></dl></li>

<li><a href="Needmore_Shale" title="Needmore Shale">Needmore Shale</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(229,172,77);text-align:center;"><a href="Lower_Devonian" class="mw-redirect" title="Lower Devonian">Lower</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(229,208,117);text-align:center;"><a href="Emsian" title="Emsian">Emsian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Huntersville_Chert" title="Huntersville Chert">Huntersville Chert</a>, <a href="Needmore_Shale" title="Needmore Shale">Needmore Shale</a>, <a href="Bois_Blanc_Formation" title="Bois Blanc Formation">Bois Blanc Formation</a></dt>

<dt><a href="Oriskany_Formation" title="Oriskany Formation">Oriskany Formation</a></dt>

<dt><a href="Helderberg_Group_(geology)" title="Helderberg Group (geology)">Helderberg Group (geology)</a></dt></dl>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(229,196,104);text-align:center;"><a href="Pragian" title="Pragian">Pragian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Helderberg_Group_(geology)" title="Helderberg Group (geology)">Helderberg Group (geology)</a></dt></dl>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(229,183,90);text-align:center;"><a href="Lochkovian" title="Lochkovian">Lochkovian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Helderberg_Group_(geology)" title="Helderberg Group (geology)">Helderberg Group (geology)</a></dt></dl>

<ul><li><dl><dd><a href="Keyser_Formation" title="Keyser Formation">Keyser Formation</a></dd>

<dd><a href="Manlius_Limestone" class="mw-redirect" title="Manlius Limestone">Manlius Limestone</a></dd></dl></li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(179,225,182);text-align:center;"><a href="Silurian" title="Silurian">S</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(230,245,225);text-align:center;"><a href="Pridoli_epoch" class="mw-redirect" title="Pridoli epoch">Pridoli</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Bass_Islands_Formation" title="Bass Islands Formation">Bass Islands Formation</a></li>

<li><a href="Akron_Formation" title="Akron Formation">Akron Formation</a><br></li></ul>

<dl><dt><a href="Salina_Group" title="Salina Group">Salina Group</a></dt>

<ul><li><dl><dd><a href="Bertie_Formation" title="Bertie Formation">Bertie Formation</a></dd></dl></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(191,230,207);text-align:center;"><a href="Ludlow_epoch" class="mw-redirect" title="Ludlow epoch">Ludlow</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(217,240,223);text-align:center;"><a href="Ludfordian" title="Ludfordian">Ludfordian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Salina_Group" title="Salina Group">Salina Group</a></dt>

<ul><li><dl><dd>Camillus Formation</dd></dl></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,236,221);text-align:center;"><a href="Gorstian" title="Gorstian">Gorstian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Salina_Group" title="Salina Group">Salina Group</a></dt>

<ul><li><dl><dd><a href="Syracuse_Formation" title="Syracuse Formation">Syracuse Formation</a></dd></dl></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(179,225,194);text-align:center;"><a href="Wenlock_(Silurian)" class="mw-redirect" title="Wenlock (Silurian)">Wenlock</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,235,209);text-align:center;"><a href="Homerian" title="Homerian">Homerian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Salina_Group" title="Salina Group">Salina Group</a></dt>

<ul><li><dl><dd><a href="Vernon_Formation" title="Vernon Formation">Vernon Formation</a></dd></dl></li></ul>

<dl><dt><a href="Lockport_Group" title="Lockport Group">Lockport Group</a></dt></dl>

<ul><li><dl><dd>Guelph Formation</dd>

<dd><a href="Eramosa_Formation" class="mw-redirect" title="Eramosa Formation">Eramosa Formation</a></dd>

<dd><a href="Goat_Island_Formation" title="Goat Island Formation">Goat Island Formation</a></dd>

<dd>Gasport Formation</dd></dl></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(153,215,179);text-align:center;"><a href="Llandovery_epoch" class="mw-redirect" title="Llandovery epoch">Llandovery</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Clinton_Group" title="Clinton Group">Clinton Group</a></dt>

<ul><li><dl><dd><a href="Rochester_Shale" class="mw-redirect" title="Rochester Shale">Rochester Shale</a></dd>

<dd><a href="Rose_Hill_Formation" title="Rose Hill Formation">Rose Hill Formation</a> "Red Clinton"</dd></dl></li></ul>

<dl><dt><a href="Medina_Group" title="Medina Group">Medina Group</a></dt>

<ul><li><dl><dd><a href="Tuscarora_Formation" class="mw-redirect" title="Tuscarora Formation">Tuscarora Formation</a></dd></dl></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(0,146,112);text-align:center;"><a href="Ordovician" title="Ordovician">O</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(127,202,147);text-align:center;"><a href="Upper_Ordovician" class="mw-redirect" title="Upper Ordovician">Upper</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Queenston_Formation" title="Queenston Formation">Queenston Formation</a></li>

<li><a href="Reedsville_Formation" title="Reedsville Formation">Reedsville Formation</a></li>

<li><a href="Utica_Shale" title="Utica Shale">Utica Shale</a></li></ul>

<dl><dt><a href="Trenton_Limestone_Group" title="Trenton Limestone Group">Trenton Limestone Group</a></dt>

<p><br>

</p>

<dl><dt><a href="Black_River_Group" title="Black River Group">Black River Group</a></dt>

<p>Loyalsburg Formation

</p>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(77,180,126);text-align:center;"><a href="Middle_Ordovician" class="mw-redirect" title="Middle Ordovician">Middle</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Wells_Creek_Formation" class="mw-redirect" title="Wells Creek Formation">Wells Creek Formation</a></li></ul>

<dl><dt><ul><li><a href="Knox_Supergroup" title="Knox Supergroup">Knox Supergroup</a></li>

<li><a href="Beekmantown_Group" class="mw-redirect" title="Beekmantown Group">Beekmantown Group</a>:</li></ul></dt></dl>

<ul><li><dl><dd><a href="Bellefonte_Formation" title="Bellefonte Formation">Bellefonte Formation</a></dd></dl></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(26,157,111);text-align:center;"><a href="Lower_Ordovician" class="mw-redirect" title="Lower Ordovician">Lower</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Knox_Supergroup" title="Knox Supergroup">Knox Supergroup</a></dt>

<dl><dt><a href="Beekmantown_Group" class="mw-redirect" title="Beekmantown Group">Beekmantown Group</a></dt>

<ul><li><dl><dd>Axeman Formation</dd>

<dd>Nittany Formation</dd>

<dd><a href="Stonehenge_Formation" class="mw-redirect" title="Stonehenge Formation">Stonehenge Formation</a></dd></dl></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(127,160,86);text-align:center;"><a href="Cambrian" title="Cambrian">Є</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(179,224,149);text-align:center;"><a href="Furongian" title="Furongian">Furongian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><ul><li><a href="Knox_Supergroup" title="Knox Supergroup">Knox Supergroup</a></li></ul></dt></dl>

<ul><li>Gatesburgh Formation</li>

<li><a href="Warrior_Formation" title="Warrior Formation">Warrior Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(153,192,120);text-align:center;"><a href="Cambrian_Series_2" title="Cambrian Series 2">Series 2</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(179,202,142);text-align:center;"><a href="Cambrian_Stage_4" title="Cambrian Stage 4">Stage 4</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Kinzers_Formation" title="Kinzers Formation">Kinzers Formation</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div>

<ul><li><a href="Potsdam_Sandstone" title="Potsdam Sandstone">Potsdam Formation</a></li>

<li>Pleasant Hill Formation</li>

<li><a href="Waynesboro_Formation" title="Waynesboro Formation">Waynesboro Formation</a></li>

<li>Tomstown Formation</li>

<li><a href="Antietam_Formation" title="Antietam Formation">Antietam Formation</a></li></ul></div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="background:;;width:2em;background:rgb(247,67,112);text-align:center;"><a href="Precambrian" title="Precambrian">pЄ</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="padding:0"><div style="padding:0 0.25em">

<li>Grenville Complex</li>

</div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Chronostratigraphy_of_West_Virginia153" style="padding:3px"><table class="nowraplinks mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="background:;"><div id="Chronostratigraphy_of_West_Virginia153" style="font-size:114%;margin:0 4em"><a href="Chronostratigraphy" title="Chronostratigraphy">Chronostratigraphy</a> of <a href="West_Virginia" title="West Virginia">West Virginia</a></div></th></tr><tr><th scope="row" class="navbox-group" style="background:;;width:2em;background:rgb(154,217,221);text-align:center;"><a href="Phanerozoic" title="Phanerozoic"><span class="smallcaps">Ph</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(242,249,29);text-align:center;"><a href="Cenozoic" title="Cenozoic"><span class="smallcaps">Cz</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(253,154,82);text-align:center;"><a href="Paleogene" title="Paleogene"><span class="smallcaps">Pe</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(253,180,108);text-align:center;"><a href="Eocene" title="Eocene">Eocene</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">Igneous intrusives</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(103,197,202);text-align:center;"><a href="Mesozoic" title="Mesozoic"><span class="smallcaps">Mz</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(52,178,201);text-align:center;"><a href="Jurassic" title="Jurassic">J</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">Igneous intrusives</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(153,192,141);text-align:center;"><a href="Paleozoic" title="Paleozoic"><span class="smallcaps">Pz</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(240,64,40);text-align:center;"><a href="Permian" title="Permian">P</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(239,88,69);text-align:center;"><a href="Cisuralian" title="Cisuralian">Cisuralian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(227,99,80);text-align:center;"><a href="Asselian" title="Asselian">Asselian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Dunkard_Group" title="Dunkard Group">Dunkard Group</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(103,165,153);text-align:center;"><a href="Carboniferous" title="Carboniferous">C</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(126,188,198);text-align:center;"><a href="Pennsylvanian_(geology)" title="Pennsylvanian (geology)">⁋</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,212,199);text-align:center;"><a href="Gzhelian" title="Gzhelian">Gzhelian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Monongahela_Formation" title="Monongahela Formation">Monongahela Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(191,208,197);text-align:center;"><a href="Kasimovian" title="Kasimovian">Kasimovian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Conemaugh_Group" title="Conemaugh Group">Conemaugh Group</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(179,203,185);text-align:center;"><a href="Moscovian_(Carboniferous)" class="mw-redirect" title="Moscovian (Carboniferous)">Moscovian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Allegheny_Formation" class="mw-redirect" title="Allegheny Formation">Allegheny Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(153,194,181);text-align:center;"><a href="Bashkirian" title="Bashkirian">Bashkirian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Pottsville_Group" class="mw-redirect" title="Pottsville Group">Pottsville Group</a></li>

<li><a href="Kanawha_Formation" title="Kanawha Formation">Kanawha Formation</a></li>

<li><a href="New_River_Formation" title="New River Formation">New River Formation</a></li>

<li><a href="Pocahontas_Formation" title="Pocahontas Formation">Pocahontas Formation</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(103,143,102);text-align:center;"><a href="Mississippian_epoch" class="mw-redirect" title="Mississippian epoch">M</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(191,194,107);text-align:center;"><a href="Serpukhovian" title="Serpukhovian">Serpukhovian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Bluestone_Formation" title="Bluestone Formation">Bluestone Formation</a></li>

<li><a href="Princeton_Sandstone" title="Princeton Sandstone">Princeton Sandstone</a></li>

<li><a href="Hinton_Formation" title="Hinton Formation">Hinton Formation</a></li>

<li><a href="Bluefield_Formation" title="Bluefield Formation">Bluefield Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(166,185,108);text-align:center;"><a href="Vis%C3%A9an" title="Viséan">Viséan</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Greenbrier_Group" title="Greenbrier Group">Greenbrier Group</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(140,176,108);text-align:center;"><a href="Tournaisian" title="Tournaisian">Tournaisian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Price_Formation" title="Price Formation">Price Formation</a></li>

<li><a href="Cuyahoga_Formation" title="Cuyahoga Formation">Cuyahoga Formation</a></li>

<li><a href="Maccrady_Formation" title="Maccrady Formation">Maccrady Formation</a></li>

<li><a href="Sunbury_Shale" title="Sunbury Shale">Sunbury Shale</a></li>

<li><a href="Berea_Sandstone" title="Berea Sandstone">Berea Sandstone</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(203,140,55);text-align:center;"><a href="Devonian" title="Devonian">D</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(241,225,157);text-align:center;"><a href="Upper_Devonian" class="mw-redirect" title="Upper Devonian">Upper</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(242,237,179);text-align:center;"><a href="Famennian" title="Famennian">Famennian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Price_Formation" title="Price Formation">Price Formation</a></li>

<li><a href="Berea_Sandstone" title="Berea Sandstone">Berea Sandstone</a></li>

<li><a href="Bedford_Shale" title="Bedford Shale">Bedford Shale</a></li>

<li><a href="Ohio_Shale" title="Ohio Shale">Ohio Shale</a></li>

<li><a href="Brallier_Formation" title="Brallier Formation">Brallier Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(242,237,173);text-align:center;"><a href="Frasnian" title="Frasnian">Frasnian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Brallier_Formation" title="Brallier Formation">Brallier Formation</a></li>

<li><a href="Java_Formation" title="Java Formation">Java Formation</a></li>

<li><a href="West_Falls_Formation" class="mw-redirect" title="West Falls Formation">West Falls Formation</a></li>

<li>Rhinestreet</li>

<li><a href="Sonyea_Formation" title="Sonyea Formation">Sonyea Formation</a></li>

<li><a href="Harrell_Shale" title="Harrell Shale">Harrell Shale</a></li>

<li><a href="Genesee_Formation" title="Genesee Formation">Genesee Formation</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(241,200,104);text-align:center;"><a href="Middle_Devonian" title="Middle Devonian">Middle</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(241,225,133);text-align:center;"><a href="Givetian" title="Givetian">Givetian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Tully_Limestone" class="mw-redirect" title="Tully Limestone">Tully Limestone</a></li>

<li><a href="Hamilton_Group" title="Hamilton Group">Hamilton Group</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(241,213,118);text-align:center;"><a href="Eifelian" title="Eifelian">Eifelian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Hamilton_Group" title="Hamilton Group">Hamilton Group</a></li>

<li><a href="Marcellus_Shale" class="mw-redirect" title="Marcellus Shale">Marcellus Shale</a></li>

<li><a href="Onondaga_Limestone" title="Onondaga Limestone">Onondaga Limestone</a></li>

<li><a href="Needmore_Shale" title="Needmore Shale">Needmore Shale</a></li>

<li><a href="Huntersville_Chert" title="Huntersville Chert">Huntersville Chert</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(229,172,77);text-align:center;"><a href="Lower_Devonian" class="mw-redirect" title="Lower Devonian">Lower</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(229,208,117);text-align:center;"><a href="Emsian" title="Emsian">Emsian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Needmore_Shale" title="Needmore Shale">Needmore Shale</a></li>

<li><a href="Huntersville_Chert" title="Huntersville Chert">Huntersville Chert</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(229,196,104);text-align:center;"><a href="Pragian" title="Pragian">Pragian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Oriskany_Sandstone" class="mw-redirect" title="Oriskany Sandstone">Oriskany Sandstone</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(229,183,90);text-align:center;"><a href="Lochkovian" title="Lochkovian">Lochkovian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Helderberg_Group" class="mw-redirect" title="Helderberg Group">Helderberg Group</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(179,225,182);text-align:center;"><a href="Silurian" title="Silurian">S</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(230,245,225);text-align:center;"><a href="Pridoli_epoch" class="mw-redirect" title="Pridoli epoch">Pridoli</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Bertie_Formation" title="Bertie Formation">Bertie Formation</a></li>

<li><a href="Bass_Islands_Formation" title="Bass Islands Formation">Bass Islands Formation</a></li>

<li><a href="Keyser_Formation" title="Keyser Formation">Keyser Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(191,230,207);text-align:center;"><a href="Ludlow_epoch" class="mw-redirect" title="Ludlow epoch">Ludlow</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(217,240,223);text-align:center;"><a href="Ludfordian" title="Ludfordian">Ludfordian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Salina_Group" title="Salina Group">Salina Group</a></li>

<li><a href="Tonoloway_Formation" title="Tonoloway Formation">Tonoloway Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,236,221);text-align:center;"><a href="Gorstian" title="Gorstian">Gorstian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Salina_Group" title="Salina Group">Salina Group</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(179,225,194);text-align:center;"><a href="Wenlock_(Silurian)" class="mw-redirect" title="Wenlock (Silurian)">Wenlock</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(204,235,209);text-align:center;"><a href="Homerian" title="Homerian">Homerian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Salina_Group" title="Salina Group">Salina Group</a></li>

<li><a href="Wills_Creek_Formation" title="Wills Creek Formation">Wills Creek Formation</a></li>

<li><a href="Williamsport_Formation" title="Williamsport Formation">Williamsport Formation</a></li>

<li><a href="McKenzie_Formation" title="McKenzie Formation">McKenzie Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(191,230,195);text-align:center;"><a href="Sheinwoodian" title="Sheinwoodian">Sheinwoodian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Lockport_Dolomite" class="mw-redirect" title="Lockport Dolomite">Lockport Dolomite</a></li>

<li><a href="McKenzie_Formation" title="McKenzie Formation">McKenzie Formation</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(153,215,179);text-align:center;"><a href="Llandovery_epoch" class="mw-redirect" title="Llandovery epoch">Llandovery</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(191,230,207);text-align:center;"><a href="Telychian" title="Telychian">Telychian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Lockport_Dolomite" class="mw-redirect" title="Lockport Dolomite">Lockport Dolomite</a></li>

<li><a href="McKenzie_Formation" title="McKenzie Formation">McKenzie Formation</a></li>

<li><a href="Keefer_Formation" class="mw-redirect" title="Keefer Formation">Keefer Formation</a></li>

<li><a href="Rose_Hill_Formation" title="Rose Hill Formation">Rose Hill Formation</a></li>

<li><a href="Rochester_Shale" class="mw-redirect" title="Rochester Shale">Rochester Shale</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(179,225,194);text-align:center;"><a href="Aeronian" title="Aeronian">Aeronian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Tuscarora_Sandstone" title="Tuscarora Sandstone">Tuscarora Sandstone</a></li>

<li>Clinton Sandstone</li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(0,146,112);text-align:center;"><a href="Ordovician" title="Ordovician">O</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(127,202,147);text-align:center;"><a href="Upper_Ordovician" class="mw-redirect" title="Upper Ordovician">Upper</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(166,219,171);text-align:center;"><a href="Hirnantian" title="Hirnantian">Hirnantian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Cincinnati_Group" title="Cincinnati Group">Cincinnati Group</a></li>

<li><a href="Juniata_Formation" title="Juniata Formation">Juniata Formation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(153,214,159);text-align:center;"><a href="Katian" title="Katian">Katian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Cincinnati_Group" title="Cincinnati Group">Cincinnati Group</a></li>

<li><a href="Juniata_Formation" title="Juniata Formation">Juniata Formation</a></li>

<li><a href="Reedsville_Formation" title="Reedsville Formation">Reedsville Formation</a></li>

<li><a href="Utica_Shale" title="Utica Shale">Utica Shale</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(140,208,148);text-align:center;"><a href="Sandbian" title="Sandbian">Sandbian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Lexington_Limestone" title="Lexington Limestone">Lexington Limestone</a></li>

<li><a href="Trenton_Limestone" class="mw-redirect" title="Trenton Limestone">Trenton Limestone</a></li></ul>

</div></td></tr></tbody></table><div>

<ul><li>Dolly Ridge Formation</li>

<li><a href="Martinsburg_Formation" title="Martinsburg Formation">Martinsburg Formation</a></li>

<li>Nealmont Limestone</li>

<li><a href="Oswego_Formation" title="Oswego Formation">Oswego Formation</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(77,180,126);text-align:center;"><a href="Middle_Ordovician" class="mw-redirect" title="Middle Ordovician">Middle</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(116,198,156);text-align:center;"><a href="Darriwilian" title="Darriwilian">Darriwilian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Trenton_Limestone" class="mw-redirect" title="Trenton Limestone">Trenton Limestone</a></li>

<li><a href="Black_River_Group" title="Black River Group">Black River Group</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(102,192,146);text-align:center;"><a href="Dapingian" title="Dapingian">Dapingian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="St._Paul_Group" title="St. Paul Group">St. Paul Group</a></li></ul>

</div></td></tr></tbody></table><div>

<ul><li><a href="St._Peter_Sandstone" title="St. Peter Sandstone">St. Peter Sandstone</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(26,157,111);text-align:center;"><a href="Lower_Ordovician" class="mw-redirect" title="Lower Ordovician">Lower</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(51,169,126);text-align:center;"><a href="Tremadocian" title="Tremadocian">Tremadocian</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Wells_Creek_Formation" class="mw-redirect" title="Wells Creek Formation">Wells Creek Formation</a></li>

<dl><dt><a href="Knox_Group" class="mw-redirect" title="Knox Group">Knox Group</a></dt></dl>

<ul><li><a href="Beekmantown_Dolomite" class="mw-redirect" title="Beekmantown Dolomite">Beekmantown Dolomite</a></li>

<li>Rose Run Sandstone</li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(127,160,86);text-align:center;"><a href="Cambrian" title="Cambrian">Є</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(179,224,149);text-align:center;"><a href="Furongian" title="Furongian">Furongian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:8em;background:rgb(230,245,201);text-align:center;"><a href="Cambrian_Stage_10" title="Cambrian Stage 10">Stage 10</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<dl><dt><a href="Knox_Group" class="mw-redirect" title="Knox Group">Knox Group</a></dt></dl>

<ul><li><a href="Copper_Ridge_Dolomite" title="Copper Ridge Dolomite">Copper Ridge Dolomite</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div>

<dl><dt><a href="Chilhowee_Group" title="Chilhowee Group">Chilhowee Group</a></dt>

<dd><a href="Antietam_Formation" title="Antietam Formation">Antietam Formation</a></dd>

<dd><a href="Harpers_Formation" title="Harpers Formation">Harpers Formation</a></dd>

<dd><a href="Weverton_Formation" title="Weverton Formation">Weverton Formation</a></dd>

<dd>Loudoun Formation</dd></dl>

<ul><li><a href="Conasauga_Group" title="Conasauga Group">Conasauga Group</a></li>

<li><a href="Conococheague_Formation" title="Conococheague Formation">Conococheague Formation</a></li>

<li><a href="Elbrook_Formation" title="Elbrook Formation">Elbrook Formation</a></li>

<li><a href="Rome_Group" title="Rome Group">Rome Group</a></li>

<li><a href="Tomstown_Dolomite" title="Tomstown Dolomite">Tomstown Dolomite</a></li>

<li><a href="Waynesboro_Formation" title="Waynesboro Formation">Waynesboro Formation</a></li></ul></div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="background:;;width:2em;background:rgb(247,67,112);text-align:center;"><a href="Precambrian" title="Precambrian">pЄ</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(247,53,99);text-align:center;"><a href="Proterozoic" title="Proterozoic">♇</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:2em;background:rgb(254,179,66);text-align:center;"><a href="Neoproterozoic" title="Neoproterozoic">Z</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6em;background:rgb(254,217,106);text-align:center;"><a href="Ediacaran" title="Ediacaran">Ediacaran</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Catoctin_Formation" title="Catoctin Formation">Catoctin Formation</a></li>

</div></td></tr></tbody></table><div>

<ul><li><a href="Swift_Run_Formation" title="Swift Run Formation">Swift Run Formation</a></li>

<li>Grenville Complex</li></ul></div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr></tbody></table></div>

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