62 
FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT 
which should be given thorough consideration by a prospective manu¬ 
facturer. 
The aim of this report is to guide the manufacturer to deposits 
worthy of his notice and to furnish owners of such clay deposits knowl¬ 
edge of their occurrence, properties, and usefulness and it is hoped that 
this work will be of some assistance in furthering the development of 
the clay industries of Florida. 
The general geology, classification, mineralogy, chemical and phy¬ 
sical properties, and uses of clays are briefly discussed in this report. 
Much has already been published on these topics and the discussion 
which follows is by no means exhaustive. It summarizes the more im¬ 
portant facts that have been brought out by previous investigators. This 
is done to answer numerous inquiries continuously being received by 
the Survey regarding the common properties of clays, and also to enable 
those people who have neither time nor facilities to consult the other 
publications to have the benefit of this knowledge which may facilitate 
their mse of the data bearing on the Florida clays. Adequate footnote 
references are made to ‘other writers so that readers may consult the 
principal papers previously published dealing with clays. 
A discussion of the methods of manufacture of clay products, 
descriptions of the individual brick plants and numerous other sections 
have been omitted in order to conserve space. Numerous photographs, 
however, have been used to show the types of machinery employed, 
types of kilns in operation, methods of clay mining, and general plan 
and arrangements of plants. 
Fuller’s earth, a clay with special properties but little or no plastic¬ 
ity, has been discussed at considerable length in previous reports of the 
Survey, particularly the Second and Sixth Annual Reports, and the 
time and funds available did not permit a further treatment of it in 
the present paper. 
FIELD WORK 
The field work was carried on during the season of 1922. At this 
time all accessible clay deposits of which the State Geological Survey 
had any knowledge were visited. Inquiries made in each locality during 
the progress of the work brought many additional deposits to notice. 
In each case the deposit was examined as thoroughly as time permitted 
and if the clay seemed promising at all a representative sample was 
