218 Carney — Possibli Overflow Channel of JPonded Waters. 



in Keuka valley overflowed by way of Bath, the altitude 

 of the channel being 1125 feet; in Cayuga* valley, which 

 bifurcates south of Ithaca, the Danbv stage, the lake of the 

 western arm, had an overflow at 1040 feet, but this stage later 

 coalesced with the ponded body in Six Mile Creek, and there- 

 after the White Church channel — 975 feet — became the spillway 

 of the resultant Lake Ithaca ; in Seneca valley the Horseheads 

 channel (900 feet) carried the overflow of Watkins Lake.f 

 In time the ponded drainage of these three valle}^s united, 

 forming glacial Lake Newberry.;}; Lake Ithaca was diverted 

 to the west as soon as the ice discovered a level on its shore 

 lower than 975 feet, the White Church overflow ; such a level 

 was revealed at Ovid.§ Lake Hammondsport, before coales- 

 cing with Watkins Lake, had an intermediate level via Wayne 

 about 10 feet lower than the Bath outlet. | 



JYeio Channels.^ 



Fairchild, in discussing the genesis of Lake Newberry, says 

 concerning the coalescence of Hammondsport Lake : " the 

 locality of its overflow was probably near Second Milo, four miles 

 south of Penn Yam"** In this area two channels have been 

 studied ; their position is indicated in fig. 1. 



Channel No. 1 (fig. 2 ). — The topographic map suggests that 

 this outlet, nearly four miles southwest of Penn Yan, is rock 

 bound ; the stream has incised the Hatch shales and flags,ff 

 developing a channel about 50 feet deep and 90 rods long. 

 The discontinuity of rock northward indicates that a salient 

 has been cut across. The altitude of the entrance of the chan- 

 nel is approximately 1080 feet ; the fall of the bed is not over 

 30 feet. The walls of this channel have a gentle slope, suggest- 

 ing either rapid or long-continued subaerial weathering ; the 

 bed is aggraded. Extending eastward, the course of the out- 

 let appears to have passed near the house of A. C. Ansley, 

 on whose farm the channel is located ; but there is no con- 

 clusive evidence of the further course taken by the stream. 



Channel No. '2. — This is three miles southeast of Penn 

 Yan. It heads on the property of John Armstrong, east 

 of the intersection of the highways, in an area containing a 

 conspicuous number of large bowdders. The entrance to this 



*H. L. Fairchild, Bull. Geol. Soc. Am., vol. vi, pp. 369-371, 1895. 

 flbid., p. 365. 



% H. L. Fairchild, this Journal, vol. vii, p. 255, 1899. 

 | Ibid. 



I H. L. Fairchild, Bull. Geol. Soc. Am., vol. x, p. 40, 1899. 

 "[[The Penn Yan and Ovid sheets of the U. S. Geol. Surv. may he of use 

 in following this discussion. 



**This Journal, vol. vii, p. 255, 1899. 



ffN. Y. State Mus., Bulletin 101, p. 47, 1906. 



