Atoka Formation - Upper part (ARPAau;0)

State	Arkansas
Name	Atoka Formation - Upper part
Geologic age	Phanerozoic \| Paleozoic \| Carboniferous Pennsylvanian-Middle [Atokan]
Original map label	&au
Comments	Sandstone alternating with thick intervals of shale. Approximately 3000 ft.maximum thickness.
Primary rock type	sandstone
Secondary rock type	shale
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Clastic > Sandstone (Bed)
Map references	Haley, B. R., Glick, E. E., Bush, W. V.; Clardy, B. F.; Stone, C. G.; Woodward, M. B., Zachry, D.L., 1993, Geologic Map of Arkansas: U.S.Geological Survey Special Geologic Map. Scale 1:500K
Unit references	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.
Geographic coverage	Conway - Faulkner - Franklin - Logan - Lonoke - Perry - Pope - Pulaski - Scott - Sebastian - White - Yell