CONTENTS 5 



T -J.! 1 . , Page 



Lithologie character q^v 



Strike, dip, and thickness ......'..'..'. q? 



Divisions ^^ 



Paleontologic character qi 



Area! distribution o^ 



Detailed sections ^^ 



Potomac River no 



Rappahannock River q^ 



Mattaponi River oq 



Pamunkey River loo 



Chickahominy River i oil 



James River i ni 



Nottoway River iqq 



The Nanjemoy formation jqo 



Name and areal distribution .'.-.. . . . ..."...'. io3 



Stratigraphic relations 103 



Lithologic character i03 



Strike, dip, and thickness 103 



Division ' , „ . 



Paleontologic character ' " 1 04 



Areal distribution ' ^ i qc 



Detailed sections ' iq^ 



Potomac River 105 



Rappahannock River 107 



Mattaponi River 1 1 n 



Pamunkey River ! . . . 114 



James River 115 



Miocene ,p^ 



The Chesapeake group 19c 



The Calvert formation | ^ j26 



Name 126 



Stratigraphic relations [ 226 



Lithologic character [ j26 



Strike, dip, and thickness 127 



Areal distribution 227 



Paleontologic character • ■ • • • ^^^ 



Detailed sections 228 



Potomac River 229 



Rappahannock River 232 



Mattaponi River 235 



Pamunkey and Chickahominy rivers •. 238 



James River 238 



Appomattox River 239 



The Choptank formation (not recognized in Virginia) 140 



The St. Mary's formation 241 



Name 141 



Stratigraphic relations 241 



Lithologic character 241 



Strike, dip, and thickness 242 



Paleontologic character 242 



Detailed sections 242 



Small streams on "Northern Neck" 242 



Rappahannock River 243 



Chickahominy and York rivers 145 



James River 246 



Blackwater River I49 



Nottoway River I53 



Meherrin Rivor I55 



The Yorktown formation . 158 



Name 258 



