STATE OF FLORIDA STATE BOARD OF CONSERVATION DIVISION OF GEOLOGY Robert O. Vernon, Director REPORT OF INVESTIGATIONS NO. 48 ANALYSIS OF THE WATER-LEVEL FLUCTUATIONS OF LAKE JACKSON NEAR TALLAHASSEE, FLORIDA By Gilbert H. Hughes U. S. Geological Survey Prepared by the UNITED STATES GEOLOGICAL SURVEY in cooperation with the DIVISION OF GEOLOGY FLORIDA BOARD OF CONSERVATION Tallahassee, Florida 1967