| Atoka Formation | |
|---|---|
| Stratigraphic range: Pennsylvanian | |
| Type | Geologic formation |
| Underlies | Hartshorne Sandstone |
| Overlies | Bloyd Formation, Johns Valley Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Region | Arkansas, Oklahoma |
| Country | United States |
| Type section | |
| Named by | J.A. Taff [1] |
Named after Atoka County, Oklahoma, the Atoka Formation is a geologic formation in central and western Arkansas, eastern Oklahoma, central and western Texas, and eastern New Mexico. [2] It is the surface rock of the Boston Mountains and dominates exposures in the Frontal Ouachita Mountains of the Arkansas River Valley. [2]
Sedimentology
The Atoka Formation is a sequence of marine sandstones, siltstones, and shales, and may be as thick at 25,000 feet in the Ouachita Mountains. [2] The formation is conformable with the Bloyd Shale in the Boston Mountains and the Johns Valley Formation in the Ouachita Mountains. [2]
Paleofauna
Trace Fossils
- C. arkansanus [3]
References
- ^ Taff, J.A.; Adams, G.I. (1900). "Geology of the eastern Choctaw coal field". Twenty-First Annual Report of the United States Geological Survey, 1899-1900, Part 2, General Geology, Economic Geology, Alaska: 272, 273–274.
- ^ a b c d "Stratigraphic Summary of the Arkansas River Valley and Ouachita Mountains". Arkansas Geological Survey. Archived from the original on 2018-05-29. Retrieved 2017-11-23.
- ^ Branson, Carl C. (May 1961). "New records of the Scyphomedusan Conostichus" (PDF). Oklahoma Geology Notes. 21 (5): 130–138. Retrieved 28 January 2018.
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