172 FLORIDA GEOLOGICAL SURVEY—15TH ANNUAL REPORT 
be of any commercial value. One boring about one-quarter mile north¬ 
west of the house indicated the following section: 
Section of Strata on the Dr. IV. P. Chamberlain Property, near Sulphur Springs. 
Feet. Inches. 
Sand, gray . 2 — 
Sand, white . 12 2 
Clay, gray, very plastic . — 2 
Sand, white . 2 — 
Clay, red, plastic . — 2 
Sand, white . ? — 
Another boring only about ten rods to the northeast of the forego¬ 
ing one showed the gray, plastic clay to have a thickness of one and one- 
half feet. 
Pockets of a buff, plastic clay, residual from the Tampa limestone, 
are of common occurrence in the western edge of Tampa and beyond the 
city limits. These are exceedingly irregular in thickness and extent and 
are of insufficient size to warrant exploitation. 
HOLMES COUNTY 
Holmes County lies in northwest Florida adjoining the Florida- 
Alabama boundary and is underlain by the Ocala, Chattahoochee and 
Alum Bluff formations. Sandy surface clays are of common occurrence 
but none are known that are desirable for burned products. 
JACKSON COUNTY 
Jackson County lies in west Florida just west of the Apalachicola 
River. It is underlain by the Ocala, Marianna, Chattahoochee, Alum 
Bluff, and Pleistocene formations. Residual Ocala, Marianna and Chat¬ 
tahoochee clays are found, but few are of commercial importance. The 
Alum Bluff formation consists essentially of sands and marls. Some 
Pleistocene flood-plain clays occur along, the Apalachicola River. 
A deposit of clay, probably Pleistocene, occurs on the property of 
the Florida Industrial School for Boys, three miles southwest of Marian¬ 
na, and is now being worked for common brick. This is a red and gray 
clay from eight to twelve feet thick overlain by a brown, sandy clay from 
one to two feet in thickness. 
Marianna is the nearest shipping point, but most of the output from 
this plant is used on the farm and the remainder is sold locally. 
