The New Albany shale in Indiana consists of the Devonian Blocher and Blackiston formations (90 feet thick) and the Mississippian Sanderson, Underwood, and Henryville formations (11 feet thick). This classification is based on floral and faunal content. The Underwood contains a Hamburg oölite fauna. These divisions continue through Kentucky, Ohio, and Tennessee. In eastern Kentucky the Trousdale, a correlate of the Blocher, is underlain by the Tully Portwood formation, which contains three coeval facies; the Underwood and Henryville are replaced by the Bedford and Sunbury. In Ohio the Blackiston was contemporaneous with the Chagrin, and the Sanderson is equivalent to the Cleveland as restricted. The Olentangy shale is basal Blackiston and Upper Devonian in age. The Chattanooga in central Tennessee contains equivalents of all the Indiana New Albany divisions. New names are proposed for some of the Chattanooga beds. The Hardin sandstone is basal Devonian; the Mississippian basal bed is the Bransford sandstone. Beds classed as Maury occur in the Chattanooga and as basal New Providence and Fort Payne. The New Providence and Fort Payne overlie the Chattanooga disconformably. The Blackiston and Sanderson are represented in Alabama.