Chattanooga Shale  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Chattanooga Shale
RTDevonian
 Upper Devonian
 Mississippian
 Kentucky
 Missouri
 Oklahoma
 Illinois
 Mississippi
 Alabama
 Georgia
 Tennessee
 Arkansas
SNUpper Devonian and Mississippian. Consists of lower Dowelltown Member and upper Gassaway Member. In some areas, includes Hardin Sandstone Member below the Dowelltown. N Alabama, Arkansas, NW Georgia, Illinois, E and W Kentucky, NE Mississippi, Missouri, O