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Atlantic and Gulf Coastal Plain region___________________________ Cretaceous__________________________________________ Tertiary_________________________________ Quaternary _______________________________________________ East-Central region of Paleozoic and other old rocks______________ 40 Precambrian_______________________________ 4O Cambrian.______________________________________________ Ordovician______________________________________________ 42" Silurian._________________________________________________ Devonian_____________________________________________ Mississippian ____ _ ______________________________________ 45-Pennsylvanian_ ___________________________________________ 4ft Permian________________________________________________ Glacial drift__________________________________ Great Plains region____________________________________________ Paleozoic-___-_-______-________-__-__-________-_____-_._ 50 Mesozoie.______________________________________________ Tertiary______________________________________________ §4 Quaternary alluvium and glacial drift________________________ 56 m IV CONTENTS Western Mountain region____________ ___________. Paleo/oic__ _________________________________ Mesozoic. _________________________________. Tertiary_____________________________________ Quaternary alluvium____ ___________________ Summary of saline ground water.__________________. Atlantic and Gulf Coastal Plain region____-__.____. East-Central region of Paleozoic and other old rocks-Great Plains region_____________________________. Western Mountain region_______________________ Literature cited.________________________________________ Tables of measurements and analyses___________.__. Index. _______________________________.___.