The Thaynes Group, Thaynes Formation in older literature, is a geologic group in eastern Idaho, western Wyoming, Utah and eastern Nevada.

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.

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