TABLE OE CONTENTS. 
PAGE 
Introduction. 39 
Oil tests in Florida. 39 
Literature ...... 41 
Acknowledgments . 41 
Composition and properties of oil and gas. 42 
Paraffin and asphalt base .. 43 
Specific gravity . 43 
The origin of petroleum . 44 
The accumulation of oil and gas..... 45 
Migration of oil . 46 
Storage of oil . 46 
Geologic structures favorable to accumulation. 47 
Inclined porous stratum. 47 
Folded strata . 49 
Anticlinal folds . 49 
Faults . 50 
Domes . 51 
Salt domes . 51 
Volcanic plugs . 53 
The depth of oil wells. 53 
Methods of drilling . 54 
Rotary.... . 54 
Cable. 54 
Diamond drill . . .. 54 
Geologic distribution of oil and gas. 56 
Geologic time table. 56 
Surface indications of petroleum .. 57 
The object of geologic investigations. 58 
Geologic formations in Florida . 59 
Lithologic characteristics and geographic distribution. 60 
Eocene . 60 
Ocala formation. 60 
Oligocene. 61 
Marianna formation. 61 
Chattahoochee formation . 61 
Tampa formation . 62 
Miocene .. . 62 
Alum Bluff formation. 62 
Jacksonville formation........ . 63 
Choctawhatchee formation . 64 
Pliocene . 64 
Pleistocene. 64 
Geologic map discussed .. 65 
Structural features. 67 
