PETROLEUM POSSIBILITIES op FLORIDA 
131 
Folded strata, 49 
Formations, age and character of under¬ 
lying the Cretaceous, 128 
discussion and mapping the distribu¬ 
tion of, 65-67 
Fort DeSoto, well at, 107-108 
Fort Meade, log of well near, 119 
Fort Myers area, 91 
Fort Myers, log of well at, 91-92, 110 
Fort Pierce, exposures near and depth 
to Eocene at, 121 
Franklin County, 65, 75, 103 
Fresh-water deposits, 55, 64, 66, 110, 114 
Fuel used in mining, 25 
Funds of the Survey, 14, 15 
Fuller’s earth, 20, 27, 62 
Future investigations of the Survey, 12 
G 
Gadsden County, 20, 27, 40, 66, 75, 10 
Gamble, Robert, 111 
Gardner, Julia, 118 
Gas, composition of, 42-43 
Gases, escape of from the earth, 57, 58 
Geologic distribution of oil and gas, 56 
Geologic formations of Gulf Coastal 
Plain, table of, 71 
Geologic formations of Florida, 59 
geographic distribution of, 60-64 
lithologic character of, 60-64 
Geologic investigations, object of, 58 
Geologic map of Florida, discussion of 
and reference to, 65-67 
Geologic provinces or subdivisions, 69- 
95 _ 
Geologic structure favorable to oil ac¬ 
cumulation, 47 
Geological Survey, purpose of, 6 
Geologic time table, 56 
Geology of Florida, literature relating 
to, 41 
Geography and vegetation of Florida, 
12-13 
Georgia, extension of formations of into 
Florida, 67, 108 
Glades County, 91, 105 
Glass sands, 13 
Goodrich, H. B., 41, 80 
Gravels, 66 
Green Cove Springs, 100 
Greensboro, Eocene age of limestones 
from well near, 76 
well drilled near, 104-105 
Grove Park, exposures near, 120 
Gunter, Herman, 5, 28, 39, 118 
Gypsum in salt domes, 52 
H 
Hamilton County, 80, 105, 106 
structure in, 106 
Hard rock phosphate deposits, 64 
Hardee County, 91, 106 
Harper, R. M., 5 
Hastings, depth to Eocene at, 120 
Hernando County, 60, 62, 70, 84, 106 
Heterostegina, 60 
Highlands County, 91, 107 
Hill, R. V., 118 
Hillsborough County, 62, 64, 70, 87, 107 
Hillsborough River, exposures on, 62,107 
Holmes County, 67, 70, 74, 108 
Hudson, L. W., 80 
Hydrogen sulphide gas, 57 
Hydrostatic pressure, cause of oil seep, 
48 
I 
Illinois, oil-producing formations of, 57 
Ilmenite, 27 
Immaculate Kaolin Co., 26 
Inclined porous stratum, oil accumula¬ 
tion in, 47-48 
Indiana, oil-producing formations of, 57 
Inorganic theory of origin of oil, 44, 45 
Iron, hydrocarbons from, 44 
Iron oxide films, 57 
J 
Jackson Bluff, exposures at, 63, 110, 112 
Jackson County, 31, 67, 70, 108 
Jackson Formation, equivalence of to the 
Ocala, 70, 72 
Jacksonville Area, 84 
Jacksonville, depth to the Eocene at, 85, 
103 
exposures near, 63, 102 
log of well at, 84-85 
Jacksonville Formation, description of, 
63 
discussion of mapping of, 66 
Jefferson County, 61, 65, 77, 109 
K 
Kaolin deposits, 26, 66, 107 
Kentucky, oil-producing formations of, 
57 
Keys of Florida, Pleistocene of the, 64, 
94-95 
underground conditions on, 94 
Key Largo limestone, 55, 95, 114 
Key Vaca, depth of well on, 128 
Key West, well at, 95, 114 
Key, West Area, 94 
depth to Lower Cretaceous in, 95 
