PETROLEUM POSSIBILITIES OR ELORIDA 
87 
Depth in feet . 
Light-colored, sandy marl with shell fragments. Pecten. Occasional 
' phosphate pebbles, black and shiny... 139-158 
Olive green sand or very sandy marl.... 158-175 
Olive green clay with black, smooth, shiny pebbles, phosphatic. 175-212 
Dark-colored, very sandy marl or calcareous sands, some broken shells. 212-240 
Olive green, very sandy and calcareous clays, or clayey sands.. 240-245 
Very sandy, dark-colored marl with shell fragments.... 245-276 
Calcareous and very sandy clay or clayey sand..... 276-300 
Dark-colored sand, broken rock and shell fragments.... 300-380 
Very sandy, dark-colored marl, sand grains small........ 380-403 
Light-colored sand, broken rock and shell fragments.... 403-458 
Dark clay and broken shells...k.......... 458-468 
Drab-colored clay ...........— 468-500 
White limestone rock with fragments of echinoderm spines... 500-510 
Chiefly sand .^,.1......—- 510-608 
White limestone with many fossils......... 608-615 
Limestone, powdered fine by the drill........... 615-775 
TAMPA AREA 
The Gulf coast of south Florida west of the Peace River, including 
Hillsborough, Pinellas, Polk, Manatee and Sarasota Counties, is an area 
in which Miocene formations are either at the surface or are covered by 
a thin veneer of Pliocene and Pleistocene. In the northern part of this 
area, west and north of Tampa, the Oligocene comes to the surface on 
the coast and in stream beds. 
The formations entered in drilling in this area include the Pliocene, 
and Pleistocene if present, the Miocene, Oligocene, Eocene and Lower 
Cretaceous. A well drilled at Tiger Bay will serve to illustrate the kind 
of sediments to be expected in drilling in this part of the state. 
Description of Samples From Well No. j of the Palmetto Phosphate Company > Tiger 
Bay, Florida* 
Depth in feet. 
The rock at this depth is a light-colored phosphatic marl or limestone. 
In texture and appearance it is like the marl which lies beneath the 
land pebble phosphates. The phosphate is in the form of smooth, 
rounded, black, brown, and white pebbles. While this is the prevail¬ 
ing material of the sample, at least one fragment consists of clear¬ 
grained quartz, held together by a phosphatic or calcareous cement 
and resembling Alum Bluff sands. Acid test showed this piece to be 
but slightly, if at all, calcareous. There are also some fragments of 
dark blue, hard rock which effervesce but slightly in acid. No fossils 
were seen in this sample..... 73 
This is also a phosphatic marl or limestone. It is similar to the 73-foot 
sample except that it is lighter in color, being light gray or nearly 
white. The phosphatic pebbles are mostly black in color, the black 
*Fla. Geol. Surv., 7th Ann. Rept., pp. 45-48, 1915. 
