THE INTERGLACIAL GORGE PROBLEM 



141 



wall of the filled gorge. There is a rock terrace' on the south 

 side of the buried gorge at 620 feet A. T., which probably repre- 

 resents a former level of the stream, for there is a tributary gorge 

 on the north side near the cemetery which enters theimain gorge 

 at about the level of this terrace. The tributary shows as a gap 

 in the wall of the main gorge, just below the cemetery and it is 

 crossed by a small stream just above the cemetery. A short dis- 



r X 





Section i. 



Section 2. 



V. Scale 5^ 



H. Tismr 



^^- 



Portage 

 Sandstones 

 and Shales 



Bowlder 

 Clay 



Fig. 2. 



tance from the inlet the jjresent stream crosses a small buried 

 gorge, which must have been another tributary, for the rock is 

 practically continuous at 720 feet A. T. between the old gorge 

 and the postglacial gorge. 



If we look upstream for the continuation of the large buried 

 gorge, we find that it appears just above the delta which was 

 built by the stream in Glacial Lake Ithaca.^ Above this delta 

 the gorge can be traced nearly a mile to where it is finally 

 obscured by the drift. In that distance the stream has cut two 

 small postglacial gorges around drift obstructions which block 



^The writer has begun a study of these rock-shelves which he hopes will lead to 

 an explanation of the direction of flow, and at the same time elucidate some other 

 points. The photograph taken in Six Mile Creek shows two terraces. 



^T. L. Watson, Report, New York State Museum (1897), pp. rSS-riiy. 



