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Atoka Formation
Geologic formation in the United States From Wikipedia, the free encyclopedia
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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]
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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
Conodonts
- G. wapanuckensis[5]
- G. bella[6]
- Hindeodella[7]
- Ligonodina
- L. lexingtonensis[8]
- O. recta[9]
Foraminifera
- Hyperammina
- H. bulbosa[17]
- Involutina
- I. semicronstrictus[18]
- Pesudostaffella
- P. atokensis[19]
- Profusulinella
- Reophax
- Thurramminoides
- T. sphaeroidalis[24]
Trace Fossils
- C. arkansanus[25]
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References
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