OPEN-FILE REPORT 92 the Hawthorn Group from much of the crest of the Ocala Platform, exposing Eocene and Oligocene carbonates (Cooke, 1945; Espenshade and Spencer, 1963; Brooks, 1966; and Scott, 1981b). This is evident in the southern portion of the map area (see OFMS 99-01). Undifferentiated sediments have subsequently been deposited on the exposed Oligocene carbonates. These consist of residual clays, sands, and aeolian sands deposited during the Pliocene to Holocene (Scott, 1997). zhapahat River LEGEND City Swallet CEDAR 1st Magnitude Sprinu Non 1st Magnitude Spring County Boundary River or Stream Lake or Pond 1:100.000 Quadrangle Alapaha River Basin Aucilla River Basin Econfina River Basin St. Marks River Basin Lower Suwannee River Basin Upper Suwannee River Basin Withlacoochee River North Basin O.F.M.S. 99. 2008 Current STATEM AP Studv Area 0 10 20 30 40 50 Miles 0 10 20 30 40 50 60 70 80 Kilometers Figure 2. Location of selected river basins, springs, swallets, and other water bodies. LII