Thaynes Group

Last updated
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
CountryFlag of the United States.svg  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]

See also

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References

  1. 1 2 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.


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