154 J. L. Rich — Physiography and Glacial Geology 



others further northeast. That these northern gaps were 

 important channels of ice movement is indicated by the fine 

 development of west-facing moraines opposite them in the 

 valleys of the Manor Kill and the Platter Kill. The moraines 

 in these valleys are even more strongly developed than those 

 along Batavia Kill. 



The writer's observations in the upper valley of the Scho- 

 harie and its tributary, the East Kill, are very meager. They 

 warrant the statement, however, that these valleys are not so 

 choked by moraine as the others just mentioned. It is possible 

 that they were occupied in part, at least, by local glaciers mov- 

 ing outward from the mountains, but this is a question which 

 must await further investigation. 



Moraines along the East Branch of the Delaware. — There is 

 an extensive series of moraines along the East Branch, extend- 

 ing from near Grand Gorge at least to Arena and probably 

 farther. They are especially well developed for several miles on 

 either side of Roxbury, and again between Margaretville and 

 Arena. Observations are not sufficiently detailed to warrant 

 any further statement concerning these moraines except that 

 on the east side of the valley just above Roxbury there are dis- 

 tinct loops convex down valley (southward). 



A well-developed delta at about 1560 feet at the mouth of 

 Montgomery Hollow at Hubbell Corners and another reported 

 by von Engeln* at the mouth of Pleasant Valley Brook just 

 opposite, indicate the presence of a standing water body at 

 about that level. The size of the first-mentioned delta indi- 

 cates that most likely the lake existed at the time of the forma- 

 tion of the moraines in Montgomery Hollow (described in the 

 following section). It seems too large to have been formed 

 by the ordinary drainage of the Hollow. 



The existence of such a lake in the valley of a south-flowing 

 river is difficult to explain unless local glaciers descending one 

 of the mountain valleys blocked the main valley farther down. 

 This is a problem which should repay investigation. 



A flat-topped terrace between Margaretville and Arena, 

 called to my attention by O. D. von Engeln, may indicate 

 another temporary lake due to a similar cause. 



Local Glaciation. 



Various scattered observations indicate the former presence 

 of local glaciers in the mountains. Some of the evidences, 

 however, like that just cited in connection with the traces of 

 local water bodies along East Branch, are indirect and inconclu- 

 sive. Features which have come under my observation are 



* Private correspondence. 



