CYCLES OF EROSION IN PENNSYLVANIA 547 
That the Kittatinny erosion cycle exceeded in duration any of 
the subsequent cycles must have been the case not alone because 
no subsequent cycle has been coextensive with it, but also because 
no subsequent cycle has succeeded in wearing down the most 
resistant rocks leveled by Kittatinny erosion and located well 
within the area of subsequent peneplanation. 
The next oldest peneplain, the Schooley, with its type locality 
the granite summits of Schooley Mountain (1,300 feet), New Jersey, 
has been traced northward to the Mohawk Valley, westward to 
Fic. 4.—Section of erosion surface on the Paleozoic, protected by a cover of 
Triassic rocks. Port Kennedy, Montgomery County, Pennsylvania. 
Syracuse,’ and southward to the Potomac.? In western New 
York it appears to coalesce with the Kittatinny, suggesting that 
in that region there was no uplift separating the two erosion 
periods. 
At the Delaware Water Gap the ridge between Godfrey Ridge 
and Kittatinny Range with summit areas at 1,000 feet may 
represent the Schooley peneplain, and Wind Gap between Blue 
Mountain and Kittatinny Mountain in Northampton County at 
the same elevation may have been a water gap during the early 
part of the Schooley erosion cycle. In the Blue Ridge province 
remnants are preserved in summit areas of 1,200 and 1,000 feet 
™ Memorandum by M. R. Campbell. 
2 Mem. by the writer. 
3 G. W. Stose, ‘‘Text of Delaware Water Gap Sheet,” U.S. Geol. Survey. 
