146 



THE ICE AGE IN NORTH AMERICA. 



nomena are developed in a marked degree upon the hills of 

 Northampton county, Pa., running up to the base of the Kit- 

 tatinny Mountain, some miles below the Delaware Water- 

 Gap. West of the mountain, in Monroe county, the valley 

 south of Stroudsburg is for several miles tilled with the 



Fig. 47.— A glaciated pebble, natural size, from the moraine on Pocono plateau, Pennsyl- 

 vania, two thousand feet above the sea, Monroe county. The striae along the longest 

 diameter are well marked. 



same characteristic ridges, knobs, and kettle-holes. On going 

 still farther west, and rising suddenly fifteen hundred feet to 

 the plateau of Pocono Mountain — the southern extension of 



