32 FLORIDA GEOLOGICAL SURVEY TENTH ANNUAL REPORT. 
ii. Sloping and covered except for occasional outcrops of impure lime- 
stones mostly containing fossils as casts 51 feet 
10. White granular limestone with numerous shells as casts 2 feet 
9. White limestone becoming upon exposure hard and of a pinkish 
color (exposed) 4 feet 
8. Steep slope partly covered but with frequent and almost continuous 
exposures of light colored impure limestone often with clay 
inclusions ■ 23 feet 
7. White granular limestone with numerous fossils as casts 1 foot 
6. White limestone becoming upon exposure hard and of a pinkish 
color 2L2 feet 
5. Light colored limestone weathering rough 2 feet 
4. White limestone becoming upon exposure hard and of a pinkish 
color 6 feet 
3. Sandy light to pale yellow limestone 2 feet 
2. Gray to bluish calcareous clay which upon drying breaks with a 
tendency to conchoidal exfoliation 4 feet 
1. Limestone at the base to water’s edge yellowish and sandy with 
few fossils, above lighter colored with small fossils as casts, 
near the top clayey 15^ feet 
The calcareous clay (No. 2) of the Aspalaga section forms a very char- 
acteristic stratum. This stratum seen in numerous exposures from Chattahoo- 
chee to Aspalaga is very porous and of light specific gravity, and except for 
the presence of calcium carbonate has many resemblances to fullers earth. The 
following is an analysis of a sample from Aspalaga. Analysis made for the 
State Survey in the office of the State Chemist, B. LI. Bridges, Analyst. 
Silica (Si 0 2 ) 39.08 
Calcium oxide (CaO) 12.00, CaCCL (calculated) 21.80 
Magnesium oxide (MgO) 8.86, MgCOs (calculated) 18.48 
Iron and alumina (Fe 2 0 .;) , ALCh 11.60 
Phosphoric acid 00.00 
Sulphate (SCh) Trace 
Moisture (100 degrees F.) 1.30 
STRUCTURE. 
While relatively few exact elevations have been available, an 
approximate determination of the actual level of the rock expos- 
ures of this formation have been made at a number of localities, 
which have, been of service in determining the structure of this 
formation. The exact level at River Junction is available through 
bench marks established by the U. S. Coast and Geodetic Survey 
and by the U. S. Army Engineers. The water level in the river at 
Blountstown has been determined from levels on the Blountstown- 
Marianna railway kindly made available through the courtesy of 
