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]
| 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 |
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]
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