A preliminary report on clays oE Florida 
125 
Fire tests: 
iperature. 
Linear Shr . 
Per Cent. 
Absorption. 
Per Cent. 
Porosity. 
Per Cent. 
Color. 
950°C. 
0.6 
16.78 
35.20 
Pink. 
1050 
1.1 
17.87 
36.40 
Light brown. 
1150 
1.1 
17.34 
36.10 
Light brown. 
1190 
1.1 
16.44 
36.20 
Pink. 
1230 
1.4 
16.31 
32.60 
Pink. 
BAY COUNTY 
Bay County is located on the Gulf of Mexico in west Florida. The 
surface materials consist of sand and marl formations, both of which 
contain day to some extent, but no deposits of sufficient purity to justify 
exploitation are known. 
BRADFORD COUNTY 
Bradford County is located in the northern part of the peninsula. 
The surface exposures in Bradford County include sandy clays and sands 
of uncertain age. Tests on three clays exposed on or near the State 
Prison Farm were made in 1914 by the Bureau of Standards, 1 but none 
of these, however, proved to be of any value for the manufacture of 
clay products. 
BREVARD COUNTY 
Brevard County is located on the southeast side of the peninsula. 
Sands, marls and shell beds comprise the surface formations, but no 
clays of any value are known at the present time. Some poor sandy 
clays occur west and southwest of Melbourne, but they are undesirable 
for clay products. 
BROWARD COUNTY 
Broward County is situated on the east side of the Everglades and 
was not included in the field work for this report. It is underlain chiefly 
by Pliocene and Pleistocene limestones, marls and sands. 
CALHOUN COUNTY 
Calhoun County lies immediately west of the Apalachicola River 
and is underlain by the Chattahoochee, Choctawhatchee and Alum Bluff 
formations in the northern part of the county. These formations con¬ 
tain a few local deposits of residual and surface clays. Undifferentiated 
sands and marls occupy the southern part of the county. Flood-plain 
Wellards, E. H., Report on Clay Tests for Paving Brick, Fla. Geol. Survey Press 
Bull. No. 7, 1915. 
