The Thaynes Group,

Thaynes Formation The Thaynes Formation is a geologic formation in Montana and Idaho, United States. It was recently elevated to group status, as the Thaynes Group. It preserves fossils dating back to the Triassic period, such as Ammonoidea, Actinopterygii, ...

in older literature, is a

geologic group Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Eart ...

in eastern Idaho, western Wyoming, Utah and eastern Nevada. It includes the Sinbad Formation,

Virgin Formation The Virgin Formation is a geologic formation in Utah. It preserves fossils dating back to the Triassic period (Spathian substage). Description The Virgin Formation consists of gray to yellowish gray to greenish gray limestone, occasionally fossi ...

and Shnabkaib Formation. The Thaynes Group is of marine origin. Its formations are interbedded with layers of the non-marine

Moenkopi Group The Moenkopi Formation is a geological formation that is spread across the U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governme ...

. It preserves

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...

dating back to the Early Triassic epoch ( Olenekian stage). The Lower Limestone Member contains the Paris biota lagerstätte, one of the first

diverse Diversity, diversify, or diverse may refer to: Business *Diversity (business), the inclusion of people of different identities (ethnicity, gender, age) in the workforce * Diversity marketing, marketing communication targeting diverse customers ...

assemblages of the Mesozoic

era An era is a span of time defined for the purposes of chronology or historiography, as in the regnal eras in the history of a given monarchy, a calendar era used for a given calendar, or the geological eras defined for the history of Earth. Compa ...

References

* Geologic groups of Idaho Geologic groups of Nevada Geologic groups of Utah Geologic groups of Wyoming Triassic System of North America {{Triassic-stub

See also

References