A PRELIMINARY REPORT ON CLAYS OF FLORIDA 125

 Fire tests:
 Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 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 clay 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,' but none of these, however, proved to be of any value for the manufacture of clay products.
 BRE:VARD 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 contain a few local deposits of residual and surface clays. Undifferentiated sands and marls occupy the southern part of the county. Flood-plain
 'Sellards, E. H., Report on Clay Tests for Paving Brick, Fla. Geol. Survey Press Bull. No. 7, 1915.