13 CONTENTS 



PAGE 



The Choptank Formation 72 



Areal Distribution 73 



Strilie, Dip, and Thiclcness 73 



Cliaracter of Materials 74 



Stratigi'aphic Relations 74 



Sub-Divisions 74 



The St. Mary's Formation 76 



Areal Distribution 76 



Strike. Dip, and Thickness 77 



Character of Materials 78 



Stratigraphic Relations 78 



Sub-Divisions 78 



Local Sections 79 



Origin of Materials 80 



The Pliocene 81 



The Lafayette Formation 81 



Areal Distribution 82 



Structure and Thickness 82 



Character of Materials 83 



Stratigraphic Relations 83 



Origin of Materials 83 



The Pleistoceme 84 



The Columbia Group 84 



The Sunderland Formation 85 



Areal Distribution 85 



Structure and Thickness 86 



Character of Materials 86 



Stratigraphic Relations 87 



Local Sections 90 



The Wicomico Formation 91 



Areal Distribution 91 



Structure and Thickness 91 



Character of Materials 92 



Stratigraphic Relations 92 



Local Sections 93 



The Talbot Formation 93 



Areal Distribution 93 



Structure and Thickness 94 



Character of Materials 95 



Stratigraphic Relations 95 



Local Sections 95 



The Recent Deposits 96 



Origin of Materials 97 



