CONTENTS 



PAGE 



PREFACE 17 



THE LOWER CRETACEOUS DEPOSITS OF MARYLAND. By Wm. 



Bullock Clark, Arthur B. Bibbins, and Edward W. Berry 23 



Introduction 23 



the physiography 23 



the geology 26 



Cretaceous 28 



Lower Cretaceous 28 



Upper Cretaceous 29 



Tertiary , 30 



Eocene 30 



Miocene 31 



Pliocene 32 



Quaternary 32 



Pleistocene 32 



Recent 33 



Historical Revibtw 34 



Bibliography 47 



Stratigraphic and Paleontologic Characteristics 56 



the POTOMAC group 57 



The Patuxent Formation 58 



Name and Synonymy 58 



Areal Distribution 58 



Lithologic Character 58 



Strike, Dip, and Thickness 60 



Stratigraphic and Structural Relations 61 



Organic Remains 63 



The Arundel Formation 64 



Name and Synonymy 64 



Areal Distribution 64 



Lithologic Character 64 



Strike, Dip, and Thickness 65 



Stratigraphic and Structural Relations 66 



Organic Remains 66 



The Patapsco Formation 67 



Name and Synonymy 67 



Areal Distribution 68 



Lithologic Character 68 



Strike, Dip, and Thickness 69 



Stratigraphic and Structural Relations 70 



Organic Remains 71 



Local Sections 72 



