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Atoka Formation
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

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

Conodonts

Cavusgnathus

C. lauta^[3]

C. sinuata^[4]

Gnathodus

G. wapanuckensis^[5]

Gondolella

G. bella^[6]

Hindeodella^[7]
Ligonodina

L. lexingtonensis^[8]

Ozarkodina

O. recta^[9]

Polygnathodella

P. attenuata^[10]

P. ouachitensis^[11]

Streptognathodus

S. cancellosus^[12]

S. gracilis^[13]

Foraminifera

Fusulinella

F. devexa^[14]

F. oliviformis^[15]

F. prolifica^[16]

Hyperammina

H. bulbosa^[17]

Involutina

I. semicronstrictus^[18]

Pesudostaffella

P. atokensis^[19]

Profusulinella

P. fittsi^[20]

P. millcreekensis^[21]

Reophax

R. fittsi^[22]

R. tumidulus^[23]

Thurramminoides

T. sphaeroidalis^[24]

Trace Fossils

Conostichus

C. arkansanus^[25]

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.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Thompson, M.L. (1948). "Studies of American fusulinids". University of Kansas Paleontological Contributions, Protozoa. 1: 184.
^ Douglass, R.C.; Nestell, M.K. (1984). "Fusulinids of the Atoka Formation, lower-middle Pennsylvanian, south-central Oklahoma" (PDF). Oklahoma Geological Survey Bulletin. 136: 19–39. Retrieved 7 June 2024.
^ Thompson, M.L. (1935). "Fusulinids from the lower Pennsylvanian Atoka and Boggy formations of Oklahoma". Journal of Paleontology. 9: 291–306.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Thompson, M.L. (1935). "The fusulinid genus Staffella in America". Journal of Paleontology. 9: 111–120.
^ Thompson, M.L. (1935). "Fusulinids from the lower Pennsylvanian Atoka and Boggy formations of Oklahoma". Journal of Paleontology. 9: 291–306.
^ Douglass, R.C.; Nestell, M.K. (1984). "Fusulinids of the Atoka Formation, lower-middle Pennsylvanian, south-central Oklahoma" (PDF). Oklahoma Geological Survey Bulletin. 136: 19–39. Retrieved 7 June 2024.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Johansson, F. C. Jr. (1960). Micropaleontology of the Wesley Johns Valley and Atoka Formations of the Ouachita Mountains of Oklahoma (PhD. dissertation). University of Wisconsin. p. 45.
^ Branson, Carl C. (May 1961). "New records of the Scyphomedusan Conostichus" (PDF). Oklahoma Geology Notes. 21 (5): 130–138. Retrieved 28 January 2018.