CONTENTS. 
Page. 
Introduction _ 8p 
Climate _ pi 
Vegetation - g 2 
Elevations _ p 2 
Description of bench marks _ 93 
Topography - 96 
Geology - j ___ 96 
Eocene _ 97 
Oligocene - 97 
Chattahoochee formation _ 97 
Surface exposures of the Chattahoochee limestone _ 100 
Structure _ 101 
Miocene _ 104 
The Alum Bluff formation_ 104 
Typical exposures of the Alum Bluff formation_ 104 
Structure _;___ 105 
The Choctawhatchee formation__,_:_:_ 108 
Typical exposures of the Choctawhatchee formation_ 109 
Pliocene -:_ 109 
Pleistocene »--- no 
Mineral resources _ in 
Limestone _ in 
Brick clays - in 
Fuller’s earth _ 112 
Phosphate _ 112 
Road materials _ 112 
Water supply -_--±.- 112 
Springs - 113 
Wakulla, Wacissa, Newport and Panacea springs—.- 113 
Geologic history of the area described_ 116 
Topographic development - 116 
Lake basins and lakes _ 118 
Large basins with shallow-water lakes- 120 
Iamonia basin _ 120 
Jackson basin - 121 
Lafayette basin --- 122 
Miccosukee basin _:_ 124 
Small relatively deep-water lakes _ 127 
Lakes Hall, Overstreet, Bradford and Orchard Pond- 127 
General considerations - 129 
Direction and course of streams- 129 
Topographic features - 130 
Stream development - I 3 2 
St. Marks drainage system --- 133 
Wakulla drainage system--- 136 
Physiogarphic features - I 37 
86 
