CORRELATION OF THE UPPER CRETA- 

 CEOUS FORMATIONS 



BY 



WM. BULLOCK CLARK, EDWARD WILBER BERRY 



AND 



JULIA A. GARDNER 



The correlation of the Upper Cretaceous formations of Maryland is 

 based upon both physical and paleontological criteria. The Maryland 

 formations extend beyond the limits of the state and especially to the 

 northward can be traced almost continuously through Delaware and 

 New Jersey to the islands off the New England coast, while to the south- 

 ward they are buried throughout Virginia by extensive deposits of Ter- 

 tiary age, although found in deep-well borings near the present coastal 

 border at Norfolk and Old Point Comfort. Further southward in North 

 Carolina they appear in surface exposures, and although found under 

 somewhat different physical conditions still show similarities in their 

 lithology and structure which suggest the practical continuity of the 

 beds not only throughout this portion of the Coastal Plain but also farther 

 southward to the Gulf region where, as might be expected, more pro- 

 nounced differences are found. Throughout the northern and central 

 part of the Atlantic Coastal Plain, however, the continuity of the deposits 

 and the similarities in lithologic characters and stratigraphic sequence are 

 such as to aid materially in the correlation of the strata that everywhere 

 lie unconformably on older deposits whether Lower Cretaceous sands and 

 clays, Triassic shales and sandstones, or crystallines of various types and 

 ages. 



The full sequence of Upper Cretaceous sediments is probably nowhere 

 found within the belt of outcrop, since the unconformities hitherto 



