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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. The Thaynes Group is of marine origin. Its formations are interbedded with layers of the non-marine Moenkopi Group.
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 biodiversity assemblages of the Mesozoic era.
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