CONTENTS. 



PAGE 



Introduction io 5 



Topography of the Floridian Plateau i°7 



Relation of the ioo-fathom curve to the present land surface and to 



greater depths io 7 



The io-fathom curve Io8 



The reefs io 9 



The Hawk Channel 1 10 



The keys I IO 



Bays and sounds behind the keys 1 1 1 



Relief of the mainland 112 



Marine bottom deposits forming in the bays and sounds behind the keys 114 



Biscayne Bay 1 * ° 



Between Old Rhodes Bank and Carysfort Light 117 



Card Sound "7 



Barnes Sound II 7 



Blackwater Sound II 7 



Hoodoo Sound ll 7 



Florida Bay T l 7 



Gun and Cat Keys, Bahamas 119 



Summary of data on the material of the deposits 119 



Report on examination of material from the sea-bottom between Miami 



and Key West, by George Charlton Matson 120 



Sources of material I2 ° 



Silica 126 



Geologic distribution of siliceous sand in Florida 127 



Calcium carbonate . 12 9 



Calcium carbonate of inorganic origin 13° 



Pleistocene limestone of southern Florida 130 



Topography of southern Florida 13 x 



Vegetation of southern Florida 13 l 



Drainage and rainfall of southern Florida 132 



Chemical denudation 133 



Precipitation of chemically dissolved calcium carbonate.. . . 135 



White-water periods 136 



Effect of sea-spray 13° 



Calcium carbonate derived through surface erosion 136 



Calcium carbonate of organic origin 137 



Resume of sources of calcareous sediments 137 



Geologic distribution of limestone in Florida 138 



Tertiary coral reefs of the Southern United States 138 



Transporting agents of the Florida coast and their effects 14° 



Constant currents I 4° 



Tidal currents *4 1 



Winds Mi 



Effect of Florida count ercurrent on shore topography of Florida. ... 142 



Banks behind keys 145 



Deltas at outer ends of passages between keys 145 



Areal distribution of the geologic formations 146 



Oligocene 146 



Vicksburg Group 146 



Apalachicola Group 146 



Miocene 147 



Pliocene 147 



Pleistocene 14 7 



General relations of geologic boundaries in Florida 148 



Drainage lines 148 



Geologic history of the Floridian Plateau 15° 



Events of Vicksburgian time 15° 



The Vicksburgian stibmergence 15° 



Depth and temperature of the waters 15° 



Summary of Vicksburgian events 15 2 



101 



