Arroyo Formation
The Arroyo Formation, sometimes termed the Lower Clear Fork Formation, is a geologic formation in Texas. It preserves fossils dating back to the Kungurian stage of the Permian period. It is the lower-most portion of the Clear Fork Group, part of a series of fossiliferous Permian strata in the south-central United States known as the red beds.
| Arroyo Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Formation |
| Unit of | Clear Fork Group |
| Underlies | Vale Formation |
| Overlies | Waggoner Ranch Formation |
| Thickness | 250 ft (76 m) |
| Lithology | |
| Primary | Limestone, mudstone |
| Other | Gypsum |
| Location | |
| Coordinates | 33.8°N 99.2°W |
| Approximate paleocoordinates | 0.4°N 29.6°W |
| Region | Texas |
| Country | United States |
| Type section | |
| Named for | Los Arroyos, Runnels County, Texas |
| Named by | Beede & Waithe |
| Year defined | 1918 |
Arroyo Formation (the United States) Arroyo Formation (Texas) | |
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