SOME FLORIDA' LAKES AND LAKE BASINS. Cl 
tahoochee formation or the Tampa formation. The drain from the 
lake as it approaches the sink passes through a narrow gorge cut 
in this limestone. 
About one-half mile farther south (Sec. 14) another sink is 
found. This third sink receives the flow from Mill Creek, a small 
stream draining considerable territory lying south of the Seaboard 
Air Line Railway and east of Lloyds. 
During a season of excessive rains these sinks are unable to 
carry away the water. Under these conditions the overflow from 
Lake Miccosukee as well as from Mill Creek ultimately finds its 
escape by flowing to the south-west past Lloyds to the St. Marks 
River. 
The surface in Miccosukee Basin is covered with muck to a 
varying depth. Borings put down near the north end of the basin, 
out from the margin of the drain, indicated the presence of muck 
for a depth of from six inches to one foot. Beneath the muck in 
this part of the basin was found a gray sand. This sand is un¬ 
derlaid, at a variable depth, by the usual red sandy clay. At the 
south end of the lake the sand is largely absent, the muck which is 
from one to three or more feet deep resting, so far as observed, di¬ 
rectly upon the red clay. 
Lake Miccosukee probably represents a basin developed by solu¬ 
tion near the headwaters of streams originally tributary to the St. 
Marks River. Previous to the formation of Miccosukee Basin the 
drainage of this part of the country doubtless passed through 
small streams, to the south past the present village of Lloyds, thence 
to the Gulf through the St. Marks River. The lake basin since its 
formation has enlarged to the north-west, the lowest part of the 
basin now being found near the sink in the north-west corner. 
Mill Creek which now enters from the south and disappears 
through a sink a few miles north of Lloyds illustrates the reversal 
of flow of a stream due to the formation of a sink. This stream, 
previous to the formation of the sink, flowed south-west to the St. 
Marks River. At the present time it flows north and enters the 
sink. At times of excessive rainfall the sink is unable to carry 
off the water and the stream under these conditions flows in its 
earlier course to the St. Marks River. 
ALLIGATOR LAKE. 
Alligator Lake lies in the central part of Columbia County, 
from one and a half to two miles southeast of Lake City. The lake 
basin has a total area of about 1,000 acres. Numerous smaller 
lakes occur to the west and north of this large lake. The sur- 
