VIRGIXIA GEOLOGICAL ST'KVBY. 



PLATE IV. 



Fig'. 1. — Bluff's above Widewater on Potomac River. Showing Patapsco formation 

 overlain by Pleistocene deposits. 



u*J* 





I'^ig. 2. — Cut on the R. F. & P. R. R. south of Aquia (reek. Sliowint; Patapsco 

 formation overlain by Aquia formation. 



PATAPSCO FORAf A'ilON. 



