64 JOHN LYON RICH AND EDWIN A. FILMER 



trough are hanging and their streams enter through narrow rock 

 gorges. 



The Six Mile Creek prong is similar to the Inlet trough though it 

 is not so deep and its sides are more flaring. The valley extends 

 southeast from Ithaca in almost a straight line to Carohne Depot, 

 about 7 miles to the southeast, where a southern prong of the valley 

 connects by a low "through valley" past White Church and Will- 

 seyville with one of the headwater branches of the Susquehanna 

 leading directly south. 



That the valley of Six Mile Creek and this "through valley" 

 were channels of vigorous ice motion during the glacial period is 

 attested by (i) the character of the "through valley" at Willsey- 

 ville, (2) the trunkated spurs and straight walls of the valley round 

 White Church and Willseyville, (3) the distribution of the moraines 

 in this latter valley and that of Six Mile Creek,^ and finally by 

 (4) the boat-shaped, typically glaciated cross-section of the lower 

 Six Mile valley, recognized first by Simonds in 1877^ and later by 

 Tarr.3 Simonds says (p. 51), referring to the Inlet and Six Mile 

 Creek valleys: 



These deep, well-worn valleys are undoubtedly the result of glacial action. 

 The mass of ice which filled the Cayuga Lake basin divided at its southern 

 extremity. One part, the larger, flowed to the south, wearing down the Inlet 

 valley, and the other traversed the Six Mile Creek valley, both of which were 

 occupied by preglacial streams. 



And Tarr {op. cit., p. 20, first paragraph) says: 



.... Both Salmon and Six Mile Creek valleys hang at a much lower 

 level than their neighbors (for example Fall, Cascadilla, and Buttermilk [Ten 

 Mile]). I am now convinced that the interpretation of this discordance as 

 opposed to the glacial erosion theory was incorrect and that these two vaUeys 

 are really confirmatory of the glacial erosion theory. This change in view is 

 the result of a recent study of the valley profiles and a mapping of the morainic 

 deposits of the valleys in question. The latter show that these valleys were 

 occupied by actively moving ice parallel to their axes while the neighboring 

 higher hanging valleys were not. A study of the profiles shows that these dis- 

 cordant hanging valleys have the U-shape of glacial erosion and not the gorge 



' See Tarr, Watkins Glen-Catatonk Folio. 



^ Simonds, American Naturalist, XI (1877), 49-51. 



^Joiir. Geol.jXlV, No. i (1906), 20. 



