66 



JOHN LYON RICH AND EDWIN A. FILMER 



shape of a rejuvenated valley, the only other explanation which seems a 

 possible one for such discordance. It is believed, therefore, that while the 



Cayuga valley was profoundly 



B- 



800 foot rocfi bench 



600 foot gorge 



deepened by ice erosion the Salmon 

 and Six Mile Creek valleys were 

 deepened moderately and the Fall, 

 Cascadilla, Buttermilk, and other 

 valleys practically not at all, since 

 they were not occupied by ice 

 freely moving along their axes. 



The evidence cited above, 

 together with the foregoing 

 quotations, makes clear the 

 point which we especially 

 desire to emphasize, namely, 

 that the Six Mile Creek valley 

 was occupied by actively 

 moving ice and that it is 

 hanging at a lower level than 

 others near by because glacial 

 erosion deepened its bottom, 

 forming the U -trough so well 

 shown in the profile (Fig. 3). 

 The rock bottom of the 

 U -trough of lower Six Mile 

 Creek valley is hanging at an 

 elevation about 100 feet 

 above the level of Cayuga 

 Lake, and about 450 feet 

 above the rock bottom of the 

 Inlet valley at this point. 



In the bottom of Six Mile 

 Creek trough there is a series 

 of three distinct gorges, 

 which, according to our inter- 

 pretation, are of different 

 ages. Two are partly, and in 



places entirely, filled with glacial drift; the third is postglacial. 



The characteristics of these gorges and their relations to each other 



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