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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Unterer Keuper</span></h1>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr"><div id="Container" class="toccolours" style="text-align: left; padding:0.5em 0 0 0; border-style:none; float:right; padding:0 0.5em; margin:0.3em 0 0.8em 1.4em;"><div id="Title" style="background-color:rgb(153,58,154); font-weight:bold; padding:0.2em; text-align:center; margin:0.6em 0 1.2em 0"><span style="color:#FFF">Germanische Trias</span></div><div id="Contains-Timeline-Scale-Notes"><div id="Scale" style="width:3.1em; position:relative; top:-0.82em; float:left; height:36em; padding:0px"><span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:34.641509433962em;"><span style="font-size:86%;white-space:nowrap;">-250 —</span></div><div style="float:right; position:absolute; right:-1px; top:32.943396226415em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:31.245283018868em;"><span style="font-size:86%;white-space:nowrap;">-245 —</span></div><div style="float:right; position:absolute; right:-1px; top:29.547169811321em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:27.849056603774em;"><span style="font-size:86%;white-space:nowrap;">-240 —</span></div><div style="float:right; position:absolute; right:-1px; top:26.150943396226em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:24.452830188679em;"><span style="font-size:86%;white-space:nowrap;">-235 —</span></div><div style="float:right; position:absolute; right:-1px; top:22.754716981132em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:21.056603773585em;"><span style="font-size:86%;white-space:nowrap;">-230 —</span></div><div style="float:right; position:absolute; right:-1px; top:19.358490566038em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:17.660377358491em;"><span style="font-size:86%;white-space:nowrap;">-225 —</span></div><div style="float:right; position:absolute; right:-1px; top:15.962264150943em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:14.264150943396em;"><span style="font-size:86%;white-space:nowrap;">-220 —</span></div><div style="float:right; position:absolute; right:-1px; top:12.566037735849em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:10.867924528302em;"><span style="font-size:86%;white-space:nowrap;">-215 —</span></div><div style="float:right; position:absolute; right:-1px; top:9.1698113207547em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:7.4716981132075em;"><span style="font-size:86%;white-space:nowrap;">-210 —</span></div><div style="float:right; position:absolute; right:-1px; top:5.7735849056604em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:4.0754716981132em;"><span style="font-size:86%;white-space:nowrap;">-205 —</span></div><div style="float:right; position:absolute; right:-1px; top:2.377358490566em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><div style="float:right; position:absolute; right:-1px; top:0.67924528301887em;"><span style="font-size:86%;white-space:nowrap;">-200 —</span></div><span style="display:none;">Skalenmarkierungen Ende</span>
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<span style="display:none;">Skalenmarkierungen Start</span><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><span style="display:none;">Skalenmarkierungen Ende</span>
<span style="display:none;">Skalenmarkierungen Start</span><span style="display:none;">Skalenmarkierungen Ende</span>
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<span style="display:none;">Skalenmarkierungen Start</span><span style="display:none;">Skalenmarkierungen Ende</span></div><div id="ScaleBar" style="width:1px; float:left; height:36em; padding:0; background-color:#242020"></div><div id="Timeline" class="toccolours" style="font-size:100%; width:100%; height:36em; padding:0px; float:left; width:10em; border:none; background-color:transparent;"><div class="bar" style="font-size:100%; background-color:rgb(152,57,153); border-width:.06em; border-style:solid none; position:absolute; text-align:center; margin-top:30.769811320755em; height:4.4309433962264em; margin-left:0em; width:4.8em;"><div class="nudge" style="font-size:100%; position:relative; top:-0.86em; left:-0em;"><span style="position:relative; align:center; vertical-align:middle; bottom:-2.2754716981132em;"><span style="font-size:90%;"> </span></span></div></div><div class="bar" style="font-size:100%; background-color:rgb(177,104,177); border-width:.06em; border-style:solid none; position:absolute; 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top:-0.75em; left:-9.8em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#007777; vertical-align:middle; line-height:100%; bottom:0;"><a href="Trias_(Geologie)" title="Trias (Geologie)">Untertrias</a></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:34.709433962264em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-4.6em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#007777; vertical-align:middle; line-height:100%; bottom:0;"><a href="Indusium_(Geologie)" title="Indusium (Geologie)">Indusium</a></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:32.603773584906em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:3.3em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#007777; vertical-align:middle; line-height:100%; bottom:0;"><a href="Buntsandstein" title="Buntsandstein">Bunt-</a><br><a href="Buntsandstein" title="Buntsandstein">sandstein</a></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:27.169811320755em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:3.3em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#007777; vertical-align:middle; line-height:100%; bottom:0;"><a href="Muschelkalk" title="Muschelkalk">Muschel-</a><br><a href="Muschelkalk" title="Muschelkalk">kalk</a></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:12.905660377358em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:3.3em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#007777; vertical-align:middle; line-height:100%; bottom:0;"><a href="Keuper" title="Keuper">Keuper</a></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:36.339622641509em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-8em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#007777; vertical-align:middle; line-height:100%; bottom:0;"><b><a href="Trias_(Geologie)" title="Trias (Geologie)">Chronostratigr.<br>Gliederung</a></b></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:36.339622641509em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:2em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#007777; vertical-align:middle; line-height:100%; bottom:0;"><b><a href="Germanische_Trias" title="Germanische Trias">German.<br>Trias</a></b></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:34.641509433962em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:1em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#000000; vertical-align:middle; line-height:100%; bottom:0;"><b><a href="Unterer_Buntsandstein" title="Unterer Buntsandstein">U.</a></b></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:33.079245283019em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:1em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#000000; vertical-align:middle; line-height:100%; bottom:0;"><b><a href="Mittlerer_Buntsandstein" title="Mittlerer Buntsandstein">M.</a></b></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:28.867924528302em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:1em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#000000; vertical-align:middle; line-height:100%; bottom:0;"><b><a href="Unterer_Muschelkalk" title="Unterer Muschelkalk">U.</a></b></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:27.169811320755em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:1em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:#000000; vertical-align:middle; line-height:100%; bottom:0;"><b><a href="Mittlerer_Muschelkalk" title="Mittlerer Muschelkalk">M.</a></b></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:18em;"><div style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:var(--color-base, #000000); 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<p>Der <b>Untere Keuper</b> (auch Unterkeuper, Lettenkeuper, Lettenkohle, Lettenkohlenkeuper) ist eine <a href="Lithostratigraphie" title="Lithostratigraphie">lithostratigraphische</a> <a href="Gruppe_(Geologie)" title="Gruppe (Geologie)">Untergruppe</a> des <a href="Keuper" title="Keuper">Keupers</a> der <a href="Germanische_Trias" title="Germanische Trias">Germanischen Trias</a>. Die lithostratigraphische Einheit wird von der <a href="Oberer_Muschelkalk" title="Oberer Muschelkalk">Oberen Muschelkalk</a>-Untergruppe unterlagert und von der <a href="Mittlerer_Keuper" title="Mittlerer Keuper">Mittleren Keuper</a>-Untergruppe überlagert. Die Ablagerungen des Unteren Keupers weisen auf <a href="Limnologie" title="Limnologie">lakustrine</a> Verhältnisse mit gelegentlichen marinen Einflüssen hin.
</p>
<div class="mw-heading mw-heading2"><h2 id="Definition">Definition</h2></div>
<p>Die Untergrenze des Unteren Keupers bzw. der Erfurt-Formation ist im Norddeutschen Becken die Basis des Lettenkohlensandsteins. In Süddeutschland liegt die Untergrenze an der Basis des Grenzbonebed. Die Obergrenze ist im gesamten Gebiet der <a href="Grenzdolomit" title="Grenzdolomit">Grenzdolomit</a>.
</p><p>Die Gesteine sind fluviatile Sandsteine, Tonsteine und geringmächtige Kohlenflöze, Kalksteine und Dolomite sowie Evaporite in Form von Sulfatknollen. Die Mächtigkeit beträgt durchschnittlich etwa 60 bis 80 m, in Grabenzonen werden auch über 100 m erreicht. In Süddeutschland variiert die Mächtigkeit von 30 m bis 0 m an den Beckenrändern zum <a href="Vindelizische_Schwelle" title="Vindelizische Schwelle">Vindelizischen Land</a> hin. Biostratigraphisch wird der Untere Keuper in das <a href="Ladinium" title="Ladinium">Ladinium</a> (Langobardium) der <a href="Trias_(Geologie)" title="Trias (Geologie)">Mitteltrias</a> datiert. Die Typusregion ist das Thüringer Becken. Das <a href="Typlokalit%C3%A4t" title="Typlokalität">Typusprofil</a> der Erfurt-Formation ist zugleich auch das Typprofil des Unteren Keuper.
</p>
<div class="mw-heading mw-heading2"><h2 id="Gliederung">Gliederung</h2></div>
<p>Der Untere Keuper umfasst im Norddeutschen Becken nur eine Formation, die <a href="Erfurt-Formation" title="Erfurt-Formation">Erfurt-Formation</a>. Im Süddeutschen Becken wird die Erfurt-Formation in den Randbereichen von der Grafenwöhr-Formation vertreten. Diese Formation umfasst auch die Randfazies des <a href="Muschelkalk" title="Muschelkalk">Muschelkalks</a>. Die Aufstellung weiterer Formationen in den westlichen Randbereichen („Randbereich zur Ardennen-Schwelle“ und „Randfazies im Ostseeraum“) ist notwendig, aber bisher noch nicht erfolgt.
</p>
<ul><li><a href="Erfurt-Formation" title="Erfurt-Formation">Erfurt-Formation</a></li>
<li>Grafenwöhr-Formation</li></ul>
<p>Der Untere Keuper kann außerdem in neun Kleinzyklen unterteilt werden.
</p>
<div class="mw-heading mw-heading2"><h2 id="Ablagerungsraum">Ablagerungsraum</h2></div>
<p>Die Gesteine des Unteren Keuper wurden in einem weiten und flachen Becken mit Flussrinnen, Seen und Sümpfen abgelagert, in das das Meer über die Burgundische Pforte gelegentlich eindrang. Diese kurzzeitigen, zyklischen Meeresvorstöße sind durch marine Faunen bis in die südliche Niederlausitz und das Osnabrücker Bergland dokumentiert. Die Flüsse kamen vom Fennoskandischen Schild. In den Landbereichen zwischen den Flüssen und Seen wurden Tone abgelagert, die Hinweise auf kurzzeitige Überflutungen und Austrocknen (Sulfatknollen) zeigen. Wurzelböden sind häufig.
</p>
<div class="mw-heading mw-heading2"><h2 id="Fossilien">Fossilien</h2></div>
<p>Der Untere Keuper ist z. T. ausgesprochen <a href="Fossil" title="Fossil">fossilreich</a>. Häufig sind <a href="Muscheln" title="Muscheln">Muscheln</a> (Bivalvia), <a href="Muschelkrebse" class="mw-redirect" title="Muschelkrebse">Muschelkrebse</a> (Ostracoda), <a href="Muschelschaler" title="Muschelschaler">Muschelschaler</a> (Conchostraca), <a href="Armf%C3%BC%C3%9Fer" title="Armfüßer">Armfüßer</a> (Brachiopoda), als große Seltenheit finden sich auch <a href="Kopff%C3%BC%C3%9Fer" title="Kopffüßer">Kopffüßer</a> (Cephalopoda). Im Grenz<a href="Bonebed" class="mw-redirect" title="Bonebed">bonebed</a> sind Knochen und Zähne von Wirbeltieren (Fische, Amphibien und anderen <a href="Landwirbeltier" class="mw-redirect" title="Landwirbeltier">Landwirbeltieren</a>) angereichert. Bei <a href="Kupferzell" title="Kupferzell">Kupferzell</a> wurden 1977 im oberen Teil des Unteren Keuper zahlreiche Amphibien entdeckt, wie <i><a href="Mastodonsaurus" title="Mastodonsaurus">Mastodonsaurus</a></i>, <i><a href="Gerrothorax" title="Gerrothorax">Gerrothorax</a></i>, <i>Plagiosuchus</i> und <i>Kupferzellia</i>. Außerdem wurden Zähne von <a href="Therapsida" class="mw-redirect" title="Therapsida">Therapsiden</a> ("frühe Säugerverwandte"), <a href="Rauisuchidae" title="Rauisuchidae">Rauisuchiern</a> und <a href="Nothosaurier" title="Nothosaurier">Nothosauriern</a> gefunden. In den Kohlen und kohligen Lagen kommen Pflanzenreste vor (<i>Equisetites</i> und <i>Neocalamites</i>); diese Schichten enthalten auch eine reiche <a href="Mikroflora" class="mw-redirect" title="Mikroflora">Mikroflora</a> (<a href="Spore" title="Spore">Sporen</a> und <a href="Pollen" title="Pollen">Pollen</a>).
</p>
<div class="mw-heading mw-heading2"><h2 id="Literatur">Literatur</h2></div>
<ul><li>Gerhard Beutler: <i>Lithostratigraphie.</i> In: Deutsche Stratigraphische Kommission (Hrsg.): <i>Stratigraphie von Deutschland IV - Keuper.</i> Courier Forschungsinstitut Senckenberg, 253: 65-84, Stuttgart 2005 <span class="-print"><a href="Internationale_Standardnummer_f%C3%BCr_fortlaufende_Sammelwerke" title="Internationale Standardnummer für fortlaufende Sammelwerke">ISSN</a> <span style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://zdb-katalog.de/list.xhtml?t=iss%3D%220341-4116%22&key=cql">0341-4116</a></span></span></li>
<li>Klaus-Peter Kelber: <i>Die versunkene Pflanzenwelt aus den Deltasümpfen Mainfrankens vor 230 Millionen Jahren. Makrofloren aus dem Germanischen Unterkeuper.</i> Beringeria, Sonderheft 1, 67 S., 100 Abb.; Würzburg 1990.</li>
<li>Edgar Nitsch: <i>Der Keuper in der Stratigraphischen Tabelle von Deutschland 2002: Formationen und Folgen.</i> Newsletters on Stratigraphy, 41(1-3): 159-171, Stuttgart 2005 <span class="-print"><a href="Internationale_Standardnummer_f%C3%BCr_fortlaufende_Sammelwerke" title="Internationale Standardnummer für fortlaufende Sammelwerke">ISSN</a> <span style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://zdb-katalog.de/list.xhtml?t=iss%3D%220078-0421%22&key=cql">0078-0421</a></span></span></li></ul>
<div class="mw-heading mw-heading2"><h2 id="Weblinks">Weblinks</h2></div>
<ul><li>Deutsche Stratigraphische Kommission (Hrsg.): <i>Stratigraphische Tabelle von Deutschland 2002</i>. Potsdam 2002, ISBN 3-00-010197-7 – <a rel="nofollow" class="external text" href="https://www.stratigraphie.de/std2002/download/STD2002_large.pdf">PDF; 6,57 MB</a> (Groß) (abgekürzt STD2002)</li>
<li><a rel="nofollow" class="external text" href="https://www.palaeodiversity.org/backissues.htm">Der Lettenkeuper - ein Fenster in die Zeit vor den Dinosauriern</a>. In: Palaeodiversity - Special Issue - 20 Kapitel jeweils als PDF</li>
<li><a rel="nofollow" class="external text" href="http://www.triasworld.de/?id=118052000029">Die Trias Mitteldeutschlands: Keuper (Lettenkeuper)</a></li>
<li><a rel="nofollow" class="external text" href="https://www.equisetites.de/palbot/triassic/triassic.html">Internet-Links zur Oberen Trias (in Englisch)</a></li></ul>
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Normdaten (Sachbegriff): <a href="Gemeinsame_Normdatei" title="Gemeinsame Normdatei">GND</a>: <span class="-print"><a rel="nofollow" class="external text" href="https://d-nb.info/gnd/4529646-7">4529646-7</a></span> </div>
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