CONTENTS 
Page. 
Introduction 9 
Acknowledgments 10 
Previous knowledge of the region : 10 
Topography of the Gulf Coastal Plain 13 
Relief 13 
Drainage 14 
Timber 15 
Geology of the Gulf Coastal Plain 15 
Subdivisions 15 
Geology of the western division 16 
Surface formations 16 
Underground conditions 18 
Section from Pleasanton to Palito Blanco 18 
Prospecting for petroleum 19 
Geology of the eastern division : _ . _ 19 
General section (!) 
Base of coastal formations •_ _ 21 
Fayette sands _ _ . 21 
Frio clays 22 
Buried beds 23 
Lafayette sands 26 
Columbia sands 26 
Beaumont clays 27 
Recent or Port Hudson clays 
Detailed sections of Coastal Plain formations 30 
Detailed sections on the Guadalupe 30 
Detailed sections on the Colorado and Brazos 32 
Detailed sections between Brazos and Trinity rivers 42 
Detailed sections in vicinity of Neches and Sabine rivers _ _■ 48 
Gravels 62 
Changes of level during deposition of Coastal Plain formations 66 
Geology of the oil pools 68 
Enumeration of oil districts 68 
Beaumont district 68 
Spindletop pool 69 
Limits of Spindletop pool 69 
Character of overlying beds 69 
Character of the oil rock 70 
Beds underlying the oil rock 71 
Structure of Spindletop pool . 72 
Well sections 74 
List of producing wells in Spindletop pool 77 
3 
