|Name||Pole Creek Shale (Upper Ordovician) and Bigfork Chert (Upper and Middle Ordovician)|
|Geologic age||Late Ordovician to Middle Ordovician|
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Carbonate > Limestone (Bed)
|Comments||Pole Creek Shale-black shale cherty in parts (300 ft.); Bigfork Chert-thin bedded gray chert inter bedded with limestone and some shale (800 ft.). Approximatly 1100 ft. maximum thickness.|
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.
Stone, C.G. and Bush, W.V. 1982, Summary of the geology of the eastern Ouachita Mountains, Arkansas: Guidebook - Arkansas Geological Commission, vol.82-2, 24 pp.
|Counties||Garland - Hot Spring - Montgomery - Polk - Pulaski - Saline|