FLORIDA GEOLOGICAL SURVEY—THIRD ANNUAL REPORT. 
road some years ago is 64 feet. By accurate levels run by one of the topograph¬ 
ical parties of the Geological Survey working in this section during the winter of 
1890-91 the elevation of the water was found to be 58 feet, thus showing that the 
lake had been changing elevation; and about two weeks ago I was informed that 
Alachua Lake had disappeared entirely, that only small pools remained and the 
usual amount immediately around the sin,k.” 
The early geological history of that section of Alachua County 
now occupied by these larger basins and lakes was apparently as 
follows: Originally the surface runoff from southeastern Alachua 
County made its way through Orange Creek and the Ocklawaha 
River into the St. Johns River. These streams were then heading 
Fig- 5 -—Sketch map of Hogtown Prairie and surroundings, illustrat¬ 
ing a stage in the development of a solution basis. From the 
Arredondo topographic sheet, U. S. Geol. Survey. The 6o-foot 
contour line borders the prairie. 
back in the plateau region of Alachua County, and were fed both 
by the surface runoff and by the numerous small springs issuing 
from the clays and sands of the Apalachicola group underlying the 
