PETROLEUM POSSIBILITIES OE ELORIDA 
59 
dip to underlie the area in question. Oil or gas seeps would indicate 
petroliferous formations, but are not the only indications and are by 
no means always present, even in areas underlaid by oil or a gas. 
GEOLOGIC FORMATIONS IN ELORIDA 
The formations exposed at the surface in Florida fall within the latest 
of the major divisions recognized in geology, namely, the Cenozoic. 
However, some of the deeper wells in the state have reached formations 
of the next older division, the Cretaceous. 
Following is a table giving the names that have been applied to the 
formations observed outcropping at the surface in Florida. In this table 
the formations are arranged in the order of their age, the younger forma¬ 
tions being placed at the top, or as nearly in this order as is practicable, 
the relative age of certain of the formations not being fully determined: 
Recent. 
Pleistocene. 
Palm Beach Limestone. 
Miami Oolitic Limestone. 
Key Largo Limestone. 
Key West Limestone. 
Lostmans River Limestone. 
Ft. Thompson Beds. 
PI iocene. 
Bone Valley Formation. 
Alachua Formation. 
Caloosahatchee Formation. 
Nashua Formation. 
Charlton Formation. 
Miocene. 
Choctawhatchee Formation. 
Jacksonville Formation. 
Alum Bluff Formation. 
Oligocene. 
Tampa Formation. 
Chattahoochee Formation. 
Marianna Formation. 
Eocene. 
Ocala Formation. 
Cretaceous, known in Florida only from well records. 
