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FLORIDA GEOLOGICAL SURVEY-NINTH ANNUAL REPORT. 
Fig. 3.—Geologic sketch map. 1. Alum Bluff formation (Miocene), with occasional exposures of the 
Chattahoochee formation. 2. Chattahoochee formation (Oligocene). 3. Undifferentiated, including the Alum 
Bluff and Choctawhatchee formations (Miocene), and possibly some later deposits in the south-western part of 
the area. Scale of map: One inch equals 11 miles. 
