208 
FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT 
clays occur in this region, but they are unfitted for use in manufactured 
products. 
UNION COUNTY 
Union County is located in the northern part of the peninsula. 
Sandy clays are of common occurrence, but none in which the clay 
content is high enough for use in burned products. 
VOLUSIA COUNTY 
Volusia County is situated in the north-central part of the peninsula 
and lies between the St. Johns River and the Atlantic Ocean. The west¬ 
ern part of the county is underlain principally by the Nashua marl. 
Sands, clays and marls comprise the surface formations. Some flood- 
plain clays occur near Lake George in the northwestern part of the 
county. 
The eastern part of the county has a heavy mantle of Pleisto¬ 
cene sands. One very small clay deposit was worked for common brick 
long ago on the coast, two miles north of Ormond Beach. The deposit 
is now covered by a sand dune and only parts of the dismantled machin¬ 
ery may be seen. 
A marl-pit in the south part of the city of DeLand contains an 
overburden of thin sedimentary clays interbedded with sands and marls. 
It has the following section: 
Section in Marl Pit, South Part of DeLand. 
Feet. 
Sand ..3 to 6 
Clay, red, sandy . 1 
Clay gray, sandy . 2 
Clay, gray, jointed . 
Shells . 
Clay, gray, brown. 1 
Shells . 
Marls. ? 
A sample of each of the two lower gray clays, which are separated 
by three inches of shells, was mixed in equal proportions and tested. 
The overburden over these clays is sufficiently great to preclude their 
having any commercial importance in themselves, but as this material 
Inches. 
6 
8 
3 
6 
10 
