CONTENTS 
Page. 
Introduction by Edwin ('. Eckel 5 
Geology 7 
Devonian 7 
Mississippian i Lower Carboniferous I 10 
Tullahoma formation 10 
St. Louis limestone 11 
Chester formation 11 
Cretaceous 12 
Tuscaloosa formation 12 
Eutaw sands . 13 
Selma chalk 16 
Ripley formation 19 
Tertiary 22 
Midway group .."..'. 22 
Clayton formation : .' . 22 
Porters Creek clay 23 
Wilcox formation . 25 
Claiborne group 28 
Tallahatta buhrstone 29 
Lisbon beds 33 
Jackson formation 33 
Vicksburg formation . 37 
Paseagoula formation 40 
Grand Gulf group 40 
Quaternary 44 
Lafayette formation 44 
Port Hudson formation 46 
Loess - 48 
Recent alluvium 49 
Mineral resources of Mississippi - - 49 
Present development 49 
Future prospects 49 
Clays and clay industries - - - 50 
( lays of the Tuscaloosa formation lower Cretaceous > 50 
Porter- Creek clays lower Eocene I 54 
Wilcox clay- Eocene) - - 55 
Stratified clays 56 
Unstratified clays - - - 56 
Notes on Wilcox clays — - - 56 
Clays of the Jackson formation < upper Eocene ) 66 
Clays of the Grand Gulf group (Miocene) 67 
Lafayette clays (early Quaternary ) 68 
Loess and yellow-loam brick clays (Quaternary) — 69 
Quaternary clays of the Gulf coast 70 
Quaternary clays of the Yazoo delta 71 
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