COXTE^'TS 



PAGE 



Character of Materials 119 



Physiographic Expression 119 



Paleontologic Character 120 



Thickness 120 



Stratigraphic Relations 121 



The Wicomico Formation 121 



Area! Distribution 121 



Character of Materials 122 



Physiographic Expression 122 



Paleontologic Character 123 



Thickness 123 



Stratigraphic Relations 123 



The Talbot Formation 124 



Areal Distribution 124 



Character of Materials 124 



Physiographic Expression 125 



Paleontologic Character 125 



Thickness 126 



Stratigraphic Relations 126 



The Recent Deposits 126 



INTERPKETATIOX OF THE GEOLOGICAL ReCOKD 127 



Sedimentary Record of the Crystalline Rocks 127 



Sedimentary Record of the Lower Cretaceous 1 28 



Sedimentary Record o'i the Upper Cretaceous 129 



Sedimentary Record of the Eocene 131 



Sedimentary Record of the Miocene 132 



Sedimentary Record of the Lafayette Formation 132 



Sedimentary Record of the Pleistocene 133 



THE MINERAL RESOURCES OF PRLNCE GEORGE'S COUNTY. By 



Bexjamix L. Miller 137 



ixtroductory 137 



The Natural Deposits I37 



The Clays I37 



Cretaceous Clays 138 



Eocene and Miocene Clays 138 



Lafayette and Pleistocene Clays 138 



The Sands I39 



The Gravels 140 



The Building Stoiie 140 



The Marls 141 



Glauconite marls 141 



Shell marls 141 



The Diatomaceous Earth 142 



The Iron Ore 142 



The Petroleum and Natural Gas 144 



