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NEW YORK STATE MUSEUM 



of 9 miles between Shortsville and Phelps was swept by the ice 

 border streams. The channeling effects of these higher streams 

 are not so pronounced as in other localities where the flow of water 

 was greater in volume, of longer duration or of steeper gradient, 

 and the limitations of the several stream levels are not all definitely 

 mapped. 



The lower channels are well marked and quite continuous. On 

 the meridian of Victor a single capacious channel, lying between 

 highlands both north and south, carried all the glacial drainage 

 represented by the several channels on the east. The Victor 

 channel heads miles southeast of Fishers with a present altitude 

 of the channel bottom of 580 feet. The earliest stream flow in this 

 notch must have been at some higher level, since the delta dropped 

 by these waters northwest of Manchester, 10 miles east, is 580-560 

 feet. Leading east from Manchester the main channel starts 580 

 feet and declines to only 570 in the 7 miles to Phelps Junction. 

 It will be seen that the fall of the streams between the Irondequoit 

 and the Seneca valleys was very small, in consequence of which the 

 flow must have been sluggish and the corrasional power weak. 

 Confirmation of this is found in the shallow, flat and indefinite 

 limitations of the channels, and in the relatively fine material com- 

 posing the terminal delta. 



Between Manchester and Phelps the present outlet . of Canan- 

 daigua lake follows the lowest glacial channel, and it is not easy to 

 assign the respective effects of the ancient and the modern stream 

 work. The flow through the Victor channel continued long 

 after the ice had left that parallel, and the latest flow probably 

 swung northward through the swampy region of Brown ville and 

 Farmington. 



All the Victor-Phelps drainage ends in a delta lying on the west 

 side of the Seneca valley and reaching northwest from Geneva for 

 6 miles or to within about 1 mile of Phelps. The delta is about 

 i\ to 2 miles wide and declines in altitude from 600 down to 460 

 feet. Having a steep eastward slope it has been deeply carved by 

 storm wash so that its delta genesis is not evident on casual inspec- 

 tion. Some parts of it resemble a kame moraine in form ; and some 

 moraine drift may be included in the deposit. Much of the finest 

 detritus seems to have been borne out into the lake and spread over 

 the low ground towards Waterloo. However, the sandy knolls 

 which now appear over the district, and noticeable along the 

 electric railroad, are dunes. 



