236 FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT


 The Florida China Clay Corporation's mine was formerly known as the Old Richmond Mine, and is located in Sec. 12, T. 20 S., R. 24 E.

 The Lake County Clay Company's plant is located in Sec. 13, T. 20 S., R. 24 E. It is operated by the same company that owns and operates the plant at Edgar in Putnam County. The mine was formerly known as the Florida Clay Company Mine and has been in operation about thirty years.

 The clay in this general region occurs in deposits of irregular thickness and outline and are separated by partitions of yellowish sand, probably old erosion channels, which run in various directions. Numerous exposures of the clay-bearing sand may be seen along the Palatlakaha River and on the south shore of Lake Harris.

 The following typical sections indicate the range in thickness of overburden, clay and the material beneath the clay-bearing formation. These sections are taken from records of borings on the property of the two companies operating here:

 Sedimentary Kaolin Sections, near Okahumpka.
 Feet.
1. Sand, yellowish (overburden) .................................... 6
 Clay, red, sandy ................................................ 3
 Sedimentary kaolin sand .......................................... 30
 B lue clay ....................................................... ?
2. Sand, surface ............................ ....................... 11
 Sedimentary kaolin sand .......................................... 27
 Lim estone ....................................................... ?
3. Sand, surface .................................................... 10
 Sedimentary kaolin sand .......................................... 30
 F lint ............................................................ ?
4. Sand, surface .................................................... 6
 Sedimentary kaolin sand .......................................... 25
 M arl ........................................................... ?
5. Sand, surface .....................................:.............. 4
 Sedimentary kaolin sand .......................................... 14
6. Sand, surface .................................................... 6
 Sedimentary kaolin sand ......................................... 19
 G reen clay ...................................................... ?