-A diagrammatic sketch drawn to illustrate the geologic structure of Florida as found on a line from north to south passing through the hard rock and pebble fields, showing the relation of the phosphate deposits to the underlying formations. Horizontal scale, i inch=i6 miles; vertical scale, i inch=400 feet, (i) Georgia- 
Florida State line. (2) Suwannee River. (3) Lake City. (4) Santa Fe River. (5) Withlacoochee River. (6) Lakeland. (7) Arcadia. (8) Caloosahatchee River. (9) Gulf Coast, (a) Upper Oligocene phosphatic marls, (b) The Ocala limestone, (c) The hard rock phosphate deposits, (d) The Bone Valley formation 
which holds the land pebble phosphate deposits, (e) Pliocene and Pleistocene deposits. 
