|Geologic age||Early Mississippian|
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
Sedimentary > Chemical > Chert (Bed)
Igneous > Volcanic (Pyroclastic-tuff)
|Comments||Black shale to slate alternating with sandstone, siltstone some chert and tuff. Approximatly 9500 ft. maximum thickness. Geosynclinal facies-composed mainly of alternating shales and sandstone including some tuffaceous beds (5600 ft.), and fossiliferous siliceous shale and graywacke.|
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||Clark - Garland - Hot Spring - Howard - Montgomery - Perry - Pike - Polk - Pulaski - Saline - Scott - Sevier - Yell|