148 THE ICE AGE IN NORTH AMERICA. 



Ontario. Mcely ensconced within their wooded shores, there 

 are here also the numerous lakelets so often found occupying 

 kettle-holes, and forming the sources of streams which issue 

 from the mountain-side to water the valleys below. There 

 are few more interesting regions in which to study an ancient 

 terminal moraine than the plateau of Pocono Mountain, be- 

 tween Tobyhanna and Tunkhannock townships, in Monroe 

 county, Pa. 



Passing still farther westward, and descending to the 

 North Fork of the Susquehanna, twenty miles below Wilkes- 

 barre, we find a remarkable terminal accumulation of glacial 

 debris tilling the valley to a great depth for some distance 

 above Beach Haven. In the immediate vicinity of the river, 

 which was one of the great lines of drainage during the Gla- 

 cial epoch, the material is more or less modified by water- 

 action ; but the unmodified moraine can be clearly traced far 

 up on either side of the valley. A few miles to the west- 

 ward, on the other side of Huntingdon Mountain, and but ten 

 or twelve miles south of the southern wall of the Alleghanies, 

 the line of terminal deposits can be traced past Asbury, 

 through a whole township and some miles beyond, up the 

 eastern side of Fishing Creek. Through all this distance, on 

 the east side of the creek, there is nothing upon the surface 

 but these irregular and confused features of a well-marked 

 terminal deposit ; while on the west side of the creek, not a 

 sign of glacial action can be seen. But suddenly, above the 

 town of Benton, the belt of confused deposits of stone and 

 gravel begins to descend the eastern side, and after crossing 

 the valley diagonally, rises, like a broken-down Chinese wall, 

 upon the western side. 



It is important to make a cautionary remark at this 

 point. The boundary so far in eastern Pennsylvania as 

 here delineated is that w r hich was determined by Professor 

 Lewds and myself in 1881, but it became probable that 

 there was a small margin of error in our delineation; while 

 from Luzerne county on, the varied fortunes of the ter- 

 minal moraine are difficult of description. The north-cen- 



