REVIEW OF THE GEOLOGY OF FLORIDA 
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Oligocene 
Tampa Formation 
Chattahoochee Formation 
Vicksburg Formation 
Eocene 
Ocala Formation 
Claiborne Formation 
Cretaceous, not known in Florida 
Comanchean, known only from well cuttings 
STRATIGRAPHIC SUCCESSION 
COMANCHEAN FORMATIONS. 
The oldest formations that have been recognized in Florida are 
those encountered in well drilling and known at present only from 
well cuttings. The fossils found in these cuttings indicate the 
presence of Comanchean formations under all of the peninsula 
and a part, at least, of West Florida. The discussion of these 
formations, together with the data from which they have been 
determined, has been given by Dr. J. A. Cushman in the Twelfth 
Annual Report of the Florida Geological Survey. The thickness 
of the Comanchean underlying Florida has not been determined. 
The formations are chiefly limestone. The Cretaceous (Upper 
Cretaceous) is wanting in all deep wells of which record has been 
obtained. 
EOCENE. 
The Eocene deposits are represented in Florida by the Clai¬ 
borne and Ocala formations. The Claiborne formation comes into 
Florida for only a short distance on the Choctawhatchee River, 
near the Georgia-Florida border. Where exposed on the Chocta¬ 
whatchee River, this formation consists of a glauconitic calcareous 
sandrock, exposures of which are seen at intervals on the river 
banks for about one and two-third miles down stream from the 
Georgia-Florida line, beyond which it passes below the bed of the 
river. The thickness of this formation in Florida has not been 
determined. The Ocala formation as developed in Florida con¬ 
sists for the most part of very pure limestone. Fossils are abun- 
