138 
FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT 
ville, was tested by the Bureau of Standards in 1914 1 . The results of 
these tests indicate that it may be used for face and common brick, hol¬ 
low blocks, drain tile, etc. Its physical properties are: 
Physical Properties of Platt Bros. South Jacksonville Clay, Bureau of 
Standards (Sample No. n). 
Plasticity. Good. 
Water of plasticity. 27.4% 
Linear air shrinkage. 6.2% 
Fire tests: 
Temperature. 
990°C. 
1020 
1050 
1080 
1110 
1140 
1170 
1200 
1230 
1260 
1290 
1320 
ESCAMBIA COUNTY 
Linear Shr. 
Porosity. 
Per Cent. 
Per Cent. 
0.05 
28.1 
Red. 
26.8 
Red. 
25.7 
Red. 
25.8 
Red. 
0.827 
24.8 
Red. 
24.6 
Red. 
22.5 
Red. 
22.5 
Red. 
2.34 
20.4 
Red. 
16.6 
Red. 
11.5 
Red. 
3.97 
7.5 
Red. 
Escambia County lies between the Escambia and the Perdido rivers 
in the extreme western end of the State. Its surface exposures are 
chiefly sands and clays of Pliocene and Pleistocene age. From the 
ceramic viewpoint this county is perhaps the most interesting one in the 
State; its clay deposits are numerous and widely distributed and these 
range in quality from common brick to stoneware and terra-cotta clays. 
Face and common brick, turpentine cups and some pottery are now being 
made from Escambia County clays and a pottery formerly located in 
Pensacola made jugs and other forms of stoneware from local deposits. 
Clays from Escambia County have probably been known and used 
longer than any others in Florida. Clay from Pensacola was shipped 
to Josiah Wedgewood 2 in England in 1766 for experimental work in 
his pottery. Williams 3 states that brick were being manufactured in 
West Florida prior to 1827 and cargoes of them were being shipped 
1 Sellards, E. H., Report on Clay Tests for Paving Brick, Fla. Geol. Survey 
Press Bull. No. 7, 1915. 
2 Meteyard, Eliza, Life of Josiah Wedgewood, Vol. I, p. 471, 1865. 
8 Williams, John L., We§t Florida, p. 69, 1827. 
