SECOND ANNUAL REPORT-PULLERS EARTH. 
287 
here overlie gray-calcareous sands similar to the sands at Rock Bluff. 
Fullers earth may be expected along the Ocklocknee River in this part 
of the county as far as Jackson's Bluff or below. 
COLUMBIA COUNTY. 
Columbia County extends from the Santa Fe River on the south 
to the northern line of the State and has a total area of 792 square 
miles. To the south the county extends into the hard rock phosphate 
section. The southern part of the county has a rolling topography 
with numerous sinks and underground cavities. The surface eleva¬ 
tion of this section does not exceed 100 feet above sea level, although 
the central part of the county is higher, approaching 200 feet in general 
elevation. The underlying limestone in central Columbia County is 
sufficiently near the surface to permit of occasional sinks and disap¬ 
pearing streams. The extreme northern part of the county is of the 
flat woods type. 
NOTES ON FULLERS EARTH. 
At High Falls about eight miles southeast of Lake City sandstones 
occur, which in lithologic character resemble those associated with the 
fullers earth. 
ALACHUA COUNTY. 
Alachua County, in north central peninsular Florida, having an 
area of 1,283 square miles, presents considerable diversity of soil and 
topography. The western two-fifths of the county has with the ex¬ 
ception of some “flat-woods” a rolling surface. In this part of the 
county the Vicksburg formations lie either at or near the surface and 
as a result the rainfall passes rapidly into the earth. The elevation of 
this part of the county is from 70 to 90 feet. 
Northeastern Alachua County, from Hague past Gainesville to 
Hawthorne, has an elevation of from 150 to 200 feet. Santa Fe Lake 
from which the Santa Fe River takes its origin rests upon this plateau. 
The Vicksburg limestone is seldom exposed in this section, being 
covered by later formations. These later formations are water bearing 
and most of the wells of the county northeast of Gainesville terminate 
in them without reaching the Vicksburg. Paynes Prairie together with 
the basins in the southeastern part of Alachua County represent an 
area in which underground solution has greatly reduced the original 
surface level. At an earlier stage the drainage from this part of the 
county passed off through Orange Lake and the Oklawaha River to 
the St. Johns River, the tributaries of the drainage system taking their 
