1 CONTENTS. 
• page:. 
Introduction ............. 113 
The area treated ......... . 114 
Geology ......... H4 
Oligocene .... 114 t 
Vicksburg group ...... 114 
Apalachicola group ...... 117 
Miocene ....... 118 
Pliocene ......... 119 
Pleistocene . 119 
Earth movements during the Pleistocene. 120 
Topography and Drainage. 121 
Elevations . ±21 
Rivers . 122 
Climate . 123 
Temperature .. 123 
Precipitation .. 125 
Soils ...,.. 127 
General discussion of underground waters. 129 
Source . 129 
Annual rainfall . 130 
Disposition of rainfall... 130 
Amount available for the underground supply. 133 
Underground circulation of water. 133 
Cause of movement. 133 
Rate of movement.... ... 133 
Depth of underground water. 134 
Hydrogen sulphide in underground water. 135 
Sulphur water not evidence of beds of sulphur. 137 
Sulphur deposits formed from hydrogen sulphide .. 138 
Absence of hydrogen sulphide from certain waters in Florida...... 138 
Amount of hydrogen sulphide influenced by preessure. 139 
Artesian water .. 139 
Artesian water defined .. 140 
Conditions necessary to obtain artesian water... 140 
Artesian basin .. 141 
Artesian slope . 142 
Artesian water from unconfined horizontal beds ... 143 
Artesian water from solution passages. 143 
Source of artesian water in Florida.... 144 
