130 FLORIDA GEOLOGICAL SURVEY SIXTH ANNUAL REPORT. 



The soil in the basin is prevaiHngly a gray sand usually darken- 

 ed by the presence of organic matter. At a depth of from one to two 

 feet the amount of organic matter is reduced, the sand being lighter 

 in color. Sandy clays are reached as a rule at a depth of from 

 two and a half to three feet. 



During a season of normal rainfall this basin is occupied by 

 a lake having a total area of approximately two thousand acres. 

 Following a period of prolonged drought the basin becomes entire- 

 ly dry, water remaining only at the sink. In times of excessive 

 rainfall the lake overflows at the east end, the water discharged 

 reaching streams tributary to the St. Marks River. 



Fig. 29. — Lake Lafayette. 



This basin has much the character of an elongated valley. The 

 general course of the streams of this part of the county, the shape 

 of the basin and particularly the topography of the surrounding 

 country indicate that the drainage of this section was originally 

 through these streams into the St. Marks River. The formation of 

 s?nks diverted the drainage to a subterranean course, the west end 

 of the basin having been reduced to a level somewhat lower than the 

 east end. The further enlargement of the basin is being carried 

 on through the formation of sinks along the border. The largest 

 of the newly formed sinks is found near the present drainage sink. 



LAKE MICCOSUKEE. 



Miccosukee Basin or Lake Miccosukee lies between Leon and 

 Jefferson Counties, the west border of the lake forming the county 

 line. A small arm of the lake, however, near the north end reaches 

 into Leon County. 



