Thaynes Group

Thaynes Group
Stratigraphic range: Triassic
TypeGroup
Sub-unitsSinbad Formation, Virgin Formation, Shnabkaib Formation
UnderliesChinle Group
OverliesKaibab Formation
Lithology
PrimaryLimestone
OtherShales, Siltstone
Location
RegionIdaho, Nevada, Utah, Wyoming
Country United States
Type section
Named byT.H. Goodspeed

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.[1] The Thaynes Group is of marine origin. Its formations are interbedded with layers of the non-marine Moenkopi Group.[1]

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.[2]

  1. ^ a b Lucas, 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.
  2. ^ 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.