Surficial Geology: Cook Mountain Formation, Claiborne Group. Tertiary (Eocene)
Greenish-gray sideritic and glauconitic clays in the upper part, and a fossiliferous marl in the lower part. These fluviatile sediments were deposited in brackish and marine environments. Driskill Mountain lies in the Sabine Uplift, a flat-topped dome in northwestern Louisiana and adjacent Texas, which rose as the younger coastal plain sediments around it subsided.

Soil Series: Darley gravelly fine sandy loam. Moderately deep, well drained, acidic, brown to red lateritic soil. Clay-rich red clay subsoil very slippery when wet.

Selected References:
Hudnall, W.H., 2002, Landforms and Surface Geology in Cooley, Michael C. and others, Soil Survey of Bienville Parish, Louisiana: U.S. Natural Resources Conservation Service.

Other suggested sources of information:
Glossary: http://www2.nature.nps.gov/geology/usgsnps/misc/glossaryAtoC.html
Time scale: http://www.ucmp.berkeley.edu/help/timeform.html
Louisiana Geological Survey: http://www.lgs.lsu.edu/