|Name||Atoka Formation, undivided|
|Geologic age||Middle Pennsylvanian- Atokan|
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Coal (Bed)
|Comments||Upper, Middle and Lower parts. Terrigenous clastic basin sequence of six or more sandstone members each seperated by black clay shale with occasional ferruginous concretions. Approximatly 15000 ft. thick. Clastic basin sequence within the Arkoma Basin, ranging from deltaic, shallow-shelf, to deep ocean enviroments. Natural gas production from sandstones, a few thin coal beds|
Taff, J.A., 1901, A comparison of the Ouachita and Arbuckle Mountain sections, Indiana Terr.: Science, pp.271-272.
Wilson, C.W., 1935, Age and correlation of Pennsylvanian surface formations and of oil and gas sands of Muskogee County, Oklahoma: AAPG Bull. 19, no. 4, pp 503-520.
Sutherland, P.K., and Henry, T,.1977, Carbonate platform facies and new stratigraphic nomenclature of the Morrowan Series (lower and middle Pennsylvanian), northeastern Oklahoma: Geo. Soc.of Amer. Bull., vol.88, no.3, pp.425-440.
Ferguson, J.G., 1920. Outlines of the geology, soils, and minerals of the State of Arkansas: Arkansas State Bureau of Mines, Manufactures and Agriculture,192 pp.
|Counties||Cleburne - Conway - Crawford - Faulkner - Franklin - Johnson - Madison - Newton - Pope - Searcy - Sebastian - Van Buren - Washington - White|