98 The Lower Cretaceous Deposits of Maryland 



throughout so extended a coast line may well involve considerable time 

 for its accomplishment, and if the transgression proceeded from the 

 north toward the south, as seems probable, the deposits in Alabama would 

 necessarily be somewhat younger than those in Virginia and Maryland. 



The diflferential movements to which the Coastal Plain has every- 

 where been subjected may readily cause, through transgression or inter- 

 formational denudation, a greater or smaller portion of an earlier forma- 

 tion to be exposed along the line of outcrop. It must not therefore be' 

 assumed that deposits at every outcrop show exact equivalency; in fact, 

 the basal strata of the Patuxent formation in central Virginia affords 

 evidence of older floral elements than the deposits elsewhere. It may 

 well be therefore that portions of the more southern strata are younger 

 than the more northern beds of this widely extended formational unit. 



A much more extended study of Lower Cretaceous deposits in the 

 south may reveal a larger assemblage of organic remains than has 

 hitherto been found. The animal remains are practically limited to the 

 Arundel formation in Maryland, while an extensive flora characterizes 

 the Patuxent and Patapsco in both Maryland and Virginia. A discovery 

 of similar floras elsewhere within the province, both in the northern and 

 the southern districts, would add largely in the final elucidation of the 

 problems presented. 



The following table presents in tentative form the correlation of the 

 Lower Cretaceous deposits throughout the Atlantic Coastal plain. 



Pennsylvania 



and 



Delaware 



Maryland 



Virginia 



North 

 Carolina 



South 

 Carolina 



Georgia 



and 



Eastern Alabama 



Patapsco 



Patapsco 









1 









Lower Cretaceous 





Patux'^nt — 



Patuxent — 



Patuxent — 



Patuxent — 



"Tuscaloosa" in 

 part 



? 





