PETROLEUM POSSIBILITIES OE ELORIDA . 75 
Depth in feet. 
Gray sandstone.............. 1245-1252 
Soft greenish clay........ 1252-1255 
Sandstone ..—..-. 1255-1269 
Greenish clay..... 1269-1292 
Limestone and sandstone in layers...........-. 1292-1342 
Phosphate rock ..'.....,..... 1342-1356 
Sandstone ...,.. 1356-1367 
Phosphate rock ..... 1367-1371 
Hard and soft rock (limestone and sandstone)....... 1371-1421 
Very fine gray sand (flow of about 10 gallons per minute of salt water at 
a temperature of 103°) ..... 1421-1432 
Greenish-gray clay beds from 2 to 20 feet thick, full of shells and small 
sharks’ teeth, alternating with limestone and sandstone beds... 1432-1547 
Sandstone rock with layers of phosphate rock (salt water found again at 
depth of 1470) .......*. 1547-1607 
No indications of oil were found. 
The formations penetrated in this well can scarcely be identified from 
the log. From fossils obtained from a well at Cantonment it is known 
that the Miocene is present, underlying this part of the State.* 
THE QUINCY AREA 
The belt of country lying between the Apalachicola and Ocklocknee 
Rivers, including Gadsden, Liberty and Franklin Counties, is in some 
respects distinctive. This area is topographically high, including some 
of the maximum elevations found in Florida. There are reasons for 
believing, however, that structurally this area is lower than is the region 
either to the east or west. The surface formations exposed in this area 
range from the Oligocene to the Pleistocene or recent formations 
near the coast. The Chattahoochee limestone (Oligocene) is found in 
stream channels and sinks in the northern part of the area. To the south 
it dips beneath later formations. The Lower Miocene, the Alum Bluff 
formation, is found over the northern one-half or more of the area, 
while the Upper Miocene (Choctawhatchee formation) covers a nar¬ 
row belt extending approximately east-west across the area. 
Wells located in the northern part of this area start near the top of 
the Oligocene or in the Miocene. The Miocene sediments are chiefly 
shell marls, clays and sands. The Oligocene represented by the Chatta¬ 
hoochee limestone will possibly be found to have a thickness approxi¬ 
mating 100 or 200 feet. The succession below the Chattahoochee lime- 
*Fla. Geol. Surv., 2nd Ann. Rept., p. 117, 1909. 
