CONTENTS. 



Page. 



Preface 7 



Cretaceous deposits of the eastern Gulf region 9 



Object and scope of the work 9 



Past and present interpretation 10 



Lower Cretaceous 10 



Upper Cretaceous 11 



Early correlations 11 



Morton's correlation 11 



Tuomey's classification 12 



Winchell's classification 12 



Hilgard's classification 12 



Smith and Johnson's classification 12 



Tuscaloosa and Eutaw formations 12 



East-central Mississippi 12 



Western Alabama _ 13 



Readjustment of the nomenclature 13 



Extent of the Tuscaloosa formation 14 



Extent of the Eutaw formation 14 



Selma chalk 15 



Name 15 



Extent 15 



Character 15 



Lithologic subdivisions . 16 



Deposition 16 



Paleontologic subdivisions 17 



Ripley formation 17 



Mississippi 17 



Tennessee and northward 17 



Alabama and Georgia 18 



Summary of present classification 19 



General sequence . 19 



Lower Cretaceous . . 20 



Upper Cretaceous - 20 



Tuscaloosa formation. . .'. ' 20 



Eutaw formation 20 



Typical beds 20 



Tombigbee sand member 21 



Coffee sand member 21 



Selma chalk 21 



Ripley formation 21 



Mississippi, Tennessee, Kentucky, and Illinois 21 



Typical beds 21 



McNairy sand member 22 



Alabama and Georgia 22 



Typical beds 22 



Cusseta sand member 22 



Providence sand member 22 



Surficial deposits 22 



Faunal zones and subzones 23 



Stratigraphic relations 23 



Fossil localities 23 



