VIRGINIA GEOLOGICAL SURVEY. 



PLATE XIX. 



Fig. 1. — View of Miocene (YorktownJ marl beds at Yorktown. (Jamestown Port- 

 land Cement Corporation.) 



Fig. 2. — ^\^iew of Miocene (Yorktown) marl beds along north side of James River, 

 soutli of rjrove Station. (Colonial Portland Cement Corporation.) 



MIOCENE (YORKTOWN) BEDS. 



