PETROLEUM POSSIBILITIES OR FLORIDA 
85 
Depth in feet. 
Marls, usually green or olive green in color, containing variable 
amount of sand, and clay. Black phosphatic pebbles, together 
with some shell fragments occur throughout the marl. Occa¬ 
sional thin layers of light-colored limestone are reported within 
this interval. First flow of water at 270 feet, 5 gallons per 
minute ............. k. .. 100 -320 
Buff clay, resembling fuller’s earth, mixed as seen in the sample 
with green sandy marl.................... 320 -340 
Greenish and sandy, clayey marl.JH. 340 -390 
Indurated sands or sandstones..... 390 -396 
Greenish sandy marls,..... .HLaAE-L...:. 396 -415 
Light-colored limestone :....... 415 -420 
Greenish calcareous sandy clay..... 420 -434 
Dark-colored hard sand rock..... 434 -435 
Olive green calcareous sandy clay..... 435 -455 
Light sandy marl..;.'.....,..........L~|||.-. -455 -455^4 
Green sandy marl.........1. 455^4-462 
Dark sandy clay..-..;...-.......... 462 -490 
Very hard dark or gray sand rock.....,. 490 -493 
Silicified and very hard shell rock, with siliceous phosphatic pebbles. 
After passing through this rock the flow is increased to 112 gallons 
per minute, temperature 71 degrees .....493 -498 
Light-colored marl .......|... 498 -500 
Hard rock ........ 500 -506 
Light gray, sandy, calcareous rock, with black phosphatic pebbles. 506 -510 
Light-colored fossiliferous limestone (Vicksburg). Upon reaching 
this formation, the flow is increased to 200 gallons per minute. 
At 625 to 635 feet the harder stratum was drilled through, which 
flowed 500 gallons per minute, temperature 74 degrees F. At 
680 feet the water pressure measured, as shown by the gauge, 12 
pounds .....:........... 510 -680 
Limestone, prevailing brownish in color and, as a rule, harder than 
above. Occasional thin layers of marl and shell. Slight in¬ 
crease of flow at 780; water pressure at 900 feet, 15 pounds; 
flow about 900 gallons per minute; temperature, 74 degrees F.. 680 -900 
Limestone similar in character to above, but as a rule not so hard. 
Flow at 980 feet, 1,500 to 2,000 gallons per minute. 900 -980 
The Eocene is entered in this well at or near a depth of 500 feet and 
the well terminates in the Lower Cretaceous. 
DAYTONA AREA 
In several counties on the eastern side of central peninsular Florida, 
the Eocene limestones are covered with Miocene and later formations 
to a depth of from 100 to 200 feet. The counties included within this 
area are St. Johns, Flagler, Putnam, Volusia, Seminole, Orange, Bre¬ 
vard .and parts of Lake and Marion Counties. At Sanford, on the St. 
Johns River, and at New Smyrna on the Atlantic coast, the Eocene lies 
at a depth approximating 100 feet; elsewhere the depth to the Eocene 
is between 100 and 200 feet. 
