4 CONTENTS. 
Geology of the oil pools — Continued. Page. 
Beaumont district — Continued. 
Region surrounding Spindletop pool . 86 
Well records r 87 
List of wells -• 103 
Port Arthur-Sabine Pass district 104 
Oil ponds 104 
Examination of mud from Gulf of Mexico, by H. J. Turner . . . 107 
Sea wax 111 
Well records 112 
Sour Lake district 113 
Location and history 113 
Well records 116 
Geologic structure 118 
Saratoga district 119 
Location and history 119 
Well records 119 
High Island district _ '. . - 122 
Location and topography 122 
Well records 124 
Geologic structure 125 
Riser Hill district 125 
Minor Texas districts 125 
Big Hill, Jefferson County 126 
Dayton Hill . 126 
Barber Hill 127 
Davis Hill 127 
Bryan Heights 127 
Big Hill, Matagorda County 127 
Jennings district 127 
Location and development 127 
Oil sand 129 
List of wells 130 
Anse La Butte district 130 
Hackberry Island 131 
Sulphur district 133 
Minor Louisiana districts 135 
Vinton 135 
Spring Hill 136 
Welsh 136 
Lake Charles 136 
Other localities 137 
The Gulf Coastal Plain oil 137 
Origin of petroleum 137 
Classification of theories . 137 
Theories of inorganic origin 138 
Theories of organic origin , 138 
Theories of combined organic and inorganic origin 139 
Conclusion 140 
Accumulation of the oil 140 
Conditions for accumulation 140 
The oil supply . . _ _ _ 140 
The reservoir rock 141 
The impervious cover 141 
