Coastal plain stratigraphic nomenclature and aquifers 

 (modified from Cushing, Kantrowitz, and Taylor, 1973)' 



System 



Series 



Stratigraphic units 



Aquifer names 



Virginia Maryland Delaware 



Quaternary 



Holocene 



1 







Quaternary aquifer 



Pleistocene 



Columbia Croup 

 umllvluou 



Columbia Group 

 until vtdod 



Columbia Group 

 undivided 



Tertiary 



Pliocene (7) 







Brandywine Formation 











Miocene 



is" 



6° 



Yorktown Formation 

 St. Marys Formation 

 Choptank Formation 

 Calvert Formation 



|| 



Yorktown Formation 

 St. Marys Formation 

 Choptank Formation 

 Calvert Formation 



Chesapeake Group 

 undivided 



Pocomoke aquifer 





Manokin aquifer 







Frederica aquifer 





Federalsburg aquifer 





Cheswole aquifer 





Oligocene 2 











Eocene 



Chi ckahomi ny Format ion 

 Nanjemoy Formation 



Piney Point 

 Formation 



Nanjemoy Formation 



Piney Point 



Nanjemoy 

 Formation 



Piney Point aquifer 





Paleocene 



Aquia Formation 

 Hattaponi Formation 



Aquia Formation 



Brightseat 

 Formation 



if 



Vincentown 

 Formation 



Hornerstown sand 



Aquia and Kin cocas 



Cretaceous 



Upper 



Monmouth Formation 

 Matawan Formation 



Magothy Formation 

 Raritan Formation 



Mount Laurel sand 



| 

 i 



Marshalltown 

 Formation 



Englishtown 



Merchant vj 1 le 

 Formation 



Magothy Formation 



Magothy aquifer 



Nonmarliie Cretaceous 



Cretaceous 



§ 1 



Patapsco Formation 

 Patuxent Formation 



If 



Patapsco Formation 

 Arundel Formation 

 Patuxent Formation 





Potomac Formation 



