Thaynes Group

{{Short description|Geologic group in the northwestern US}}

{{Infobox rockunit

| name = Thaynes Group

| image =

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| type = Group

| age = Triassic

| period = Triassic

| prilithology = Limestone

| otherlithology = Shales, Siltstone

| namedfor =

| namedby = T.H. Goodspeed

| region = Idaho, Nevada, Utah, Wyoming

| country = {{USA}}

| coordinates =

| unitof =

| subunits = Sinbad Formation, Virgin Formation, Shnabkaib Formation

| underlies = Chinle Group

| overlies = Kaibab Formation

| thickness =

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The Thaynes Group, Thaynes Formation in older literature, is a geologic group in eastern Idaho, western Wyoming, Utah and eastern Nevada. It includes the Sinbad Formation, Virgin Formation and Shnabkaib Formation.{{cite journal |last1=Lucas |first1=Spencer G. |author-link1=Spencer G. Lucas |last2=Krainer |first2=Karl |last3=Milner |first3=Andrew R. C. |year=2007 |title=The type section and age of the Timpoweap Member and stratigraphic nomenclature of the Triassic Moenkopi Group in Southwestern Utah |journal=New Mexico Museum of Natural History and Science Bulletin |volume=40 |pages=109–117 |url=https://www.researchgate.net/publication/237500803}} The Thaynes Group is of marine origin. Its formations are interbedded with layers of the non-marine Moenkopi Group.

It preserves fossils dating back to the Early Triassic epoch (Olenekian stage). The Lower Limestone Member contains the Paris biota lagerstätte, one of the first diverse assemblages of the Mesozoic era.{{cite journal |last1=Brayard |first1=Arnaud |last2=Krumenacker |first2=L. J. |last3=Botting |first3=Joseph P. |last4=Jenks |first4=James F. |last5=Bylund |first5=Kevin G. |last6=Fara |first6=Emmanuel |last7=Vennin |first7=Emmanuelle |last8=Olivier |first8=Nicolas |last9=Goudemand |first9=Nicolas |last10=Saucède |first10=Thomas |last11=Charbonnier |first11=Sylvain |last12=Romano |first12=Carlo |last13=Doguzhaeva |first13=Larisa |last14=Thuy |first14=Ben |last15=Hautmann |first15=Michael |last16=Stephen |first16=Daniel A. |last17=Thomazo |first17=Christophe |last18=Escarguel |first18=Gilles |title=Unexpected Early Triassic marine ecosystem and the rise of the Modern evolutionary fauna |journal=Science Advances |year=2017 |volume=3 |issue=2 |pages=e1602159 |doi=10.1126/sciadv.1602159 |pmid=28246643 |pmc=5310825 |bibcode=2017SciA....3E2159B |doi-access=free }}