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 |
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]