LD. Chester—Gravels of Southern Delaware. 37 
the writer does not feel at liberty to make any special use of 
t. McGee's results previous to their publication. 
_ Mr. C. E. Hall in his Report on Southeastern Pennsylvania 
has expressed the view that the Mesozoic strata lying to the 
Southeast once extended far to the northwest, so as to overlie 
the Azoic, and that these isolated patches may represent the 
remnants of this former extension. Thus far I think, that in 
absence of direct evidence regarding the age of the gravels we 
are led to regard them as more probably of late Jurassic or 
early Cretaceous. 
Considering again the great erosion which the High Level 
Gravels bave suffered, it is interesting to enquire into what has 
me of the portion removed. No doubt it has suffered re- 
* Mesozoic Strata of Virginia. This Journal, III, vol. xvii, p. 31. 
