SECOND ANNUAL REPORT—-MINERAL INDUSTRIES. 
243 
They are underlain by a sticky blue clay. It is reported that beneath 
the blue clay a fullers earth occurs, and that this in turn passes at the 
depth of about 70 feet into a scarcely indurated shell stratum. A well 
put down by the Edgar Plastic Kaolin Company is reported to have 
passed through coarse superficial sand, 10 feet; kaolin bearing sands 30 
or more feet; sticky blue clay with fullers earth beneath about 40 feet; 
scarcely indurated shell stratum, 20 feet; the well terminated on a hard 
limestone rock at the depth of 90 feet. 
The kaolin in Lake County occurs under conditions similar to those 
found in Putnam County. The superficial sands here as at the Edgar 
mines are coarse and contain white siliceous pebbles. The kaolin bear¬ 
ing sands are gray in color except where stained red with iron. They 
are separated by a seeming unconformity from the loose sands above. 
At places a small amount of mica is found in the kaolin sands which is 
screened out in the process of washing. Sands of similar character 
but with a larger proportion of iron occur in the vicinity of Leesburg 
and Hawthorne and are used for road materials. 
Four plants were engaged in mining plastic kaolin during 1908. 
Two of these, under the management of the Edgar Plastic Kaolin Co., 
are located at Edgar in Putnam County. The two other plants are the 
Richmond Kaolin Co., of Richmond, Florida, and the Florida Clay Co., 
of Yalaha, Florida, both in Lake County. 
BRICK MAKING CPAYS. 
The surface deposits of north and central Florida contain many clay 
beds. These clay deposits are often of local extent, and usually of 
variable character. Sands and sandy clays make up the surface deposit 
over much of the northern tier of counties west of the Suwanee River. 
Less well defined clays of local extent and variable character occur 
widely in peninsular Florida. For the purpose of brick making a clay 
should mold easily, and burn hard at a low temperature without exces¬ 
sive loss from warping and cracking. Such beds as occur in Florida 
suitable for brick making are confined to no particular geological hori¬ 
zon. The total number of common brick made in Florida during 1907 
as reported by the United States Geological Survey was 51,779,000 
valued at $343,704. 
PEAT. 
Investigations of the peat deposits of the State made during the 
past year have proven the presence of very extensive peat deposits 
widely distributed throughout the State. The fuel tests made in this 
connection in the fuel testing laboratory of the United States Geo- 
