66 FLORIDA GEOLOGICAL SURVEY-THIRD ANNUAL REPORT.
road some years ago is 64 feet. By accurate levels run by one of the topographical parties cf the Geological Survey working in this section during the winter of 189o-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 sink."
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, illustrating 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 issting" from the clays and sands of the Apalachicola group underlying th, e