CONTENTS 7 



Page 



The Sunderland formation 207 



The Wicomico formation 207 



The Talbot formation 208 



Recent '. 209 



Geological History of the Vibqikia Coastal Plain 210 



Pre-Cretaceous history 210 



Early Cretaceous history 211 



Late Cretaceous history 212 



Eocene history 213 



Miocene history 213 



Pliocene history 215 



Pleistocene history 215 



Recent history 217 



Physiographic Record 219 



Lafayette stage 219 



Sunderland stage 220 



Wicomico stage 220 



Talbot stage ' 221 



Recent stage 222 



Economic Products of the Virginia Coastal Plain. By Thomas L. Watson. . 223 



Introduction 223 



Discussion of individual products 223 



Clays 223 



Description of clay areas 225 



Tlie Alexandria area and vicinity 225 



The Fredericksburg area 225 



The Wilmont area 226 



The Layton area 227 



The Milford area 228 



The Richmond area 228 



The Fort Lee area 231 



The Curie's Neck area 232 



The Chester area 233 



The Bermuda Hundred area 233 



The Petersburg area 233 



The Broadway area 234 



The City Point area 234 



The Sturgeon Point area 235 



The Oldfield area 235 



The Belfield area 236 



The Norfolk area and vicinit\- 236 



The Suifolk area " 237 



Sand and gravel 239 



Sand 239 



Gravel *. 241 



Diatomaceous earth 243 



Greensand marl 247 



Calcareous ( shell ) marl 249 



Use in agriculture 250 



Use in Portland cement manufacture 252 



Mineral paint 257 



Iron ore 258 



Building stones 258 



Peat 259 



Underground waters 262 



Soils 263 



