552 



W. M. DAVIS — DATES OF TOPOGKAl'HIC FORMS. 



Tlie uplifted Cretaceous Peneplain in the Neio Jersey Highlands. — The New 

 Jersey highlands are iu many ways homologous with the Berkshire high- 

 lands of Massachusetts. They are both composed in greatest part of crystal- 

 line rocks ; both are greatly disturbed ; both lie between belts of Triassic 

 deposits on the east and Cambrian strata on the west. The correspondence 

 may be found in form as well as in structure and associations. The high- 

 lands of New Jersey possess in a conspicuous degree the evenness of summit 

 outline that prevails in Massachusetts. Standing on the northern end of 

 Schooley's mountain, near the center of the highlands (see figure 2), the 

 surrounding members of the plateau show a marked tendency to rise to the 



Figure 2— Cretaceous Peneplain in New Jersey. 



general upland level, but not to pass above it. This feature was recognized 

 by Professor Cook some years ago, although it does not clearly appear that 

 he explained it as a result of denudation while the region stood at a less 

 altitude. Rewrote: 



"The Highland mountain range consists of many ridges, which are in part sepa- 

 rated by deep valleys and in part coalesce, forminj; plateaus or table-lands of small 

 extent. Some of the included valleys are quite as deep as the red sandstone plain on 

 the south and the Kittatinny valley on the north and west. * * * ^ character- 

 istic feature is the absence of what might he called Alpine structure or scenery. There 

 are no prominent peaks or cones. The ridges are even-topped for long distances and 

 the average elevation is uniform over wide areas. Looking at the crests alone, and 

 imagining the valleys and depressions tilled, the surface would approximate to a 



