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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 byJ.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

Conodonts

C. lauta [3]
C. sinuata [4]
G. wapanuckensis [5]
G. bella [6]
L. lexingtonensis [8]
O. recta [9]
P. attenuata [10]
P. ouachitensis [11]
S. cancellosus [12]
S. gracilis [13]

Foraminifera

F. devexa [14]
F. oliviformis [15]
F. prolifica [16]
H. bulbosa [17]
I. semicronstrictus [18]
P. atokensis [19]
P. fittsi [20]
P. millcreekensis [21]
R. fittsi [22]
R. tumidulus [23]
T. sphaeroidalis [24]

Trace Fossils

C. arkansanus [25]

References

  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ 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.
  7. ^ 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.
  8. ^ 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.
  9. ^ 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.
  10. ^ 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.
  11. ^ 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.
  12. ^ 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.
  13. ^ 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.
  14. ^ Thompson, M.L. (1948). "Studies of American fusulinids". University of Kansas Paleontological Contributions, Protozoa. 1: 184.
  15. ^ 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.
  16. ^ Thompson, M.L. (1935). "Fusulinids from the lower Pennsylvanian Atoka and Boggy formations of Oklahoma". Journal of Paleontology. 9: 291–306.
  17. ^ 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.
  18. ^ 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.
  19. ^ Thompson, M.L. (1935). "The fusulinid genus Staffella in America". Journal of Paleontology. 9: 111–120.
  20. ^ Thompson, M.L. (1935). "Fusulinids from the lower Pennsylvanian Atoka and Boggy formations of Oklahoma". Journal of Paleontology. 9: 291–306.
  21. ^ 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.
  22. ^ 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.
  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.
  24. ^ 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.
  25. ^ Branson, Carl C. (May 1961). "New records of the Scyphomedusan Conostichus" (PDF). Oklahoma Geology Notes. 21 (5): 130–138. Retrieved 28 January 2018.