Thaynes Limestone
Geologic formation in Montana and Idaho, USA
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The Thaynes Formation is a geologic formation in Montana and Idaho, United States. It was recently elevated to group status, as the Thaynes Group.[1]
| Thaynes Formation | |
|---|---|
| Stratigraphic range: Triassic | |
| Type | Formation |
| Underlies | Ankareh Formation |
| Overlies | Woodside Formation |
| Lithology | |
| Primary | Limestone |
| Location | |
| Region | Montana, Idaho, Wyoming |
| Country | United States |
It preserves fossils dating back to the Triassic period, such as Ammonoidea, Actinopterygii, Actinistia, Conodonta, Gastropoda, Nautiloidea, Ichthyosauria, and others. A diverse fauna known as the Paris biota[2] has been described from the Thaynes Formation.
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