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Thaynes Group

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Geologic group in the northwestern US

Thaynes Group
Stratigraphic range:Triassic
Type	Group
Sub-units	Sinbad Formation,Virgin Formation,Shnabkaib Formation
Underlies	Chinle Group
Overlies	Kaibab Formation
Lithology
Primary	Limestone
Other	Shales,Siltstone
Location
Region	Idaho,Nevada,Utah,Wyoming
Country	United States
Type section
Named by	T.H. Goodspeed

TheThaynes Group,Thaynes Formation in older literature, is ageologic group in easternIdaho, westernWyoming,Utah and easternNevada. It includes theSinbad Formation,Virgin Formation andShnabkaib Formation.^[1] The Thaynes Group is of marine origin. Its formations are interbedded with layers of the non-marineMoenkopi Group.^[1]

It preservesfossils dating back to theEarly Triassic epoch (Olenekian stage). The Lower Limestone Member contains theParis biota lagerstätte, one of the firstdiverse assemblages of theMesozoic era.^[2]

^^a ^bLucas, Spencer G.; Krainer, Karl; Milner, Andrew R. C. (2007)."The type section and age of the Timpoweap Member and stratigraphic nomenclature of the Triassic Moenkopi Group in Southwestern Utah".New Mexico Museum of Natural History and Science Bulletin.40:109–117.
^Brayard, Arnaud; Krumenacker, L. J.; Botting, Joseph P.; Jenks, James F.; Bylund, Kevin G.; Fara, Emmanuel; Vennin, Emmanuelle; Olivier, Nicolas; Goudemand, Nicolas; Saucède, Thomas; Charbonnier, Sylvain; Romano, Carlo; Doguzhaeva, Larisa; Thuy, Ben; Hautmann, Michael; Stephen, Daniel A.; Thomazo, Christophe; Escarguel, Gilles (2017)."Unexpected Early Triassic marine ecosystem and the rise of the Modern evolutionary fauna".Science Advances.3 (2): e1602159.Bibcode:2017SciA....3E2159B.doi:10.1126/sciadv.1602159.PMC 5310825.PMID 28246643.