324 



Correlation of the Upper Cretaceous Formations 



The larger formational units above described can be readily recognized 

 in both areas on stratigraphic grounds as well, but the smaller subdivisions 

 of the New Jersey area are not present in Maryland. 



Correlation With the South Atlantic and Eastern Gulf Coastal 

 Plain Formations 

 The correlation of the Maryland Upper Cretaceous formations with 

 those of the South Atlantic and eastern Gulf states is likewise based upon 

 both physical and paleontological criteria. Because of the extensive 

 overlapping of Tertiary formations in Virginia, and again in parts of 

 South Carolina and Georgia, the continuity of the Upper Cretaceous for- 

 mations from Maryland southward to the Gulf is with less certainty 

 assured. However, the known character of the deposition and the dis- 

 covery of Upper Cretaceous marine strata in the deep-well borings at 

 Norfolk and Old Point Comfort make it highly probable that such con- 

 tinuity exists beneath the blanket of Tertiary formations. Furthermore, 

 the materials are similar in character, although differences are found, 

 particularly in the great development of the Selma Chalk of the eastern 

 Gulf. The stratigraphic position of the Upper Cretaceous strata, how- 

 ever, is essentially the same in the general relationships which these beds 

 bear to underlying and overlying formations. 



COMPARATIVE TABLE OF MARYLAND, SOUTH ATLANTIC AND 

 EASTERN GULF UPPER CRETACEOUS FORMATIONS 



Maryland 



North and South 

 Carolina 



Georgia 



Alabama 



Monmouth 



Pedee 



Ripley 



\\ Ripley 

 Sexma\^ 





Black Creek 

 /^ Middendokf 



^\ 



Matawak 



Eutaw 



Eutaw 







Magothy 





Tuscaloosa 











Raeitan 









