PETROLEUM POSSIBILITIES OF ELORIDA 
107 
HIGHLANDS county 
Highlands County lies west of the Kissimmee River and extends 
west to and includes the southernmost part of the lakes of the lake region 
of Florida. In the lake region are found sands and sandy clays, with 
more or less kaolin, the age of which has not been satisfactorily deter¬ 
mined. Aside from these deposits, exposures in the county are rare 
and the geology imperfectly determined. 
' In 1919 a well was drilled by E. A. Durst at Sebring, in this county, 
to a depth of 1,200 feet. This is an 8-inch well, cased to 404 feet. The 
water is reported to stand 60 feet from the surface. 
HILLSBOROUGH COUNTY 
Hillsborough County is on the Gulf coast of southern Florida. The 
surface formations in the northwestern part of this county, at Tampa 
and on the Hillsboro River, are the Tampa limestone of Oligocene age. 
In the southern part of the county the Alum Bluff formation (Miocene) 
is at or very near the surface. Some Pleistocene is to be expected near 
the coast, and in the eastern part of the county a thin veneer of Pliocene 
(Bone Valley formation) overlies the Alum Bluff (Miocene). 
Numerous wells have been drilled for water at Tampa and elsewhere 
in this county. Following is a log of a well drilled at Ft. De Soto, made 
up from samples of cuttings; record from U. S. Geological Survey, Wa¬ 
ter Supply Paper No. 319, p. 321, 1913: 
Log of the Well at Ft. De Soto 
From samples of drillings furnished by S. W. Bryan. 
Depth from surface. 
Sand, fine, white; fragments of shells..... 0- 6 
Sand, mixed fine, white and dark colored, with fragments of shells. 6- 30 
Sand, dark gray to greenish gray; partly consolidated.. 30- 55 
Limestone, dense, gray, porous, containing some shells.... 55- 64 
Limestone, dense, gray, and granular gray sandstone; numerous shells.. 64- 85 
Limestone, light gray, porous. 85- 96 
Limestone, mixed light and dark gray. 96-110 
Shells and shell fragments_____________ 110-118 
Limestone, dense, dark gray............ 118-130 
Marl, fine grained; a few shell fragments...... 130-145 
Limestone, dense, dove-colored ..... 145-158 
Limestone, fine, white ...... 158-175 
Limestone, light, dove-colored .... 175-190 
Marl, thin, granular, containing sand...... 190-212 
Sand, pale yellow ...... 212-226 
