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. It is the surface rock of the Boston Mountains and dominates exposures in the Frontal Ouachita Mountains of the Arkansas River Valley.
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. The formation is conformable with the Bloyd Shale in the Boston Mountains and the Johns Valley Formation in the Ouachita Mountains.
Paleofauna Conodonts Cavusgnathus C. lauta C. sinuata Gnathodus G. wapanuckensis Gondolella G. bella Hindeodella Ligonodina L. lexingtonensis Ozarkodina O. recta Polygnathodella P. attenuata P. ouachitensis Streptognathodus S. cancellosus S. gracilis
Foraminifera Fusulinella F. devexa F. oliviformis F. prolifica Hyperammina H. bulbosa Involutina I. semicronstrictus Pesudostaffella P. atokensis Profusulinella P. fittsi P. millcreekensis Reophax R. fittsi R. tumidulus Thurramminoides T. sphaeroidalis
Trace Fossils Conostichus C. arkansanus
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