Arroyo Formation
Geologic formation in Texas, U.S. / From Wikipedia, the free encyclopedia
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The Arroyo Formation, sometimes termed the Lower Clear Fork Formation, is a geologic formation in Texas.[1] It preserves fossils dating back to the Kungurian stage of the Permian period.[2] 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.
Quick Facts Type, Unit of ...
Arroyo Formation | |
---|---|
Stratigraphic range: Kungurian | |
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 / 33.8; -99.2 |
Approximate paleocoordinates | 0.4°N 29.6°W / 0.4; -29.6 |
Region | Texas |
Country | United States |
Type section | |
Named for | Los Arroyos, Runnels County, Texas |
Named by | Beede & Waithe |
Year defined | 1918 |
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