Name Tallahassee limestone applied to lower unit of late middle Eocene in subsurface of western FL near Tallahassee. Ordinarily underlies Avon Park limestone (named) but in some wells occurs below the Ocala. Overlies early middle Eocene beds, either the clastic sediments of Cook Mountain age or Lake City limestone (named). Composed chiefly of cream-colored and tan crystalline limestone with some softer argillaceous limestone. Also with minor amounts of chert and gypsum. Thickness ranges from more than 75 ft in wells near its western edge to 550 ft in Wakulla Co., and 650 ft in Jefferson Co. Tentatively correlated with Yegua formation (Claiborne). Avon Park limestone, Tallahassee limestone, and Lake City limestone represent Claiborne group in peninsular FL, and where all three units are present, they appear to make a conformable sequence in most places.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Both the Tallahassee and the Gadsden Formations are "subsumed" under the newly named Oligocene Ochlockonee Formation of this report. Lower part of the Ochlockonee was previously included in the Tallahassee Limestone, while the upper part was included in the Gadsden Limestone. The name Tallahassee limestone of Applin and Applin (1944) is not reintroduced as a name for this formation because no type well was ever designated and as described it is stratigraphically inconsistent. According to the author the term would require unreasonable redefinition and revision, and would be different in content from the original intended use of the formation name. The Gadsden is not used because it would take major revision and expansion of the original concept of the formation.

Source: GNU records (USGS DDS-6; Reston GNULEX).