40 II. L. I''AIR('I1IM' — (II.ACIAL WATIiKS IX l''IN(il';i; LAKi;S Kl'liJloX 



hold the waters at Potter al)ove 1,000 feet, the apitroximate lieighi of 

 the col at Friend. 



The lower and main terrace of the Potter delta, with an aneroid ele- 

 vation of 1,080 feet, does not correspond to any })roniinent water-level in 

 the Keuka valle3% bnt with accurate leveling and allowance for the dif- 

 ferential uplift may be found to correlate with the col at Friend. This 

 lower Flint Creek Valley water should be called the Potter lake. 



Keuka Valley 



Since yiublication of the former descri])tion of the Hamnionds})ort 

 lake, with its outlet south through Bath, fuller study of the region and 

 the shorelines has brought to light ncAv and interesting facts. The lake 

 history of the valley is similar to that of the Canandaigua valley in re- 

 spect to a second and east-side outlet and two stages of the local waters. 

 This later channel passes through the village of Wa3aie, about two miles 

 southeast of Keuka village and a less distance east of the present lake. 

 It is apparently wholly in drift, but the channel features are well \n-e- 

 served. The col is immediately south of the Wayne cemetery, the alti- 

 tude being, as measured by a recent surve}^ for an electric railroad, 1,116 

 feet, Keuka lake surface being taken as 709. The definite channel heads 

 about 60 rods below the cemeter}^ leads southeast through the western 

 edge of Wayne village, and enters lake Wanetta, the whole length being 

 less than a mile. The width of the channel at bottom is about 150 feet. 

 The grade is gentle and cutting was not great as the chain of lakes in 

 the valley south of Wayne, established a local baselevel and gave a check 

 to erosion. The ultimate outlet was into the Cohocton river, the same as 

 the earlier outlet at Bath. 



On the eastern slope of the Keuka valley, something over a mile 

 east of Grove Spring and about one and one-half miles west of Wayne 

 village, two distinct shorelines have been traced for one-fourth of a mile, 

 curving around the north-facing hill. These cross the east and west road 

 diagonally, and are most distinct south of the road, on land of Mr Ezra 

 Nickerson. They appear as beach ridges in front of wave-cut cliffs, and 

 are composed of the triturated and decomposed shale of the hill. 



The lower of these beaches or l)ars was found by spirit-level to have 

 the same elevation as the head of the Wayne channel. The other ridge 

 is 30 feet higher and is somewhat stronger and better defined. 



The present difference in elevation between the Bath outlet and this 

 later, east-side, Wayne outlet is not over 10 feet, according to the rail- 

 road surveys. However, the differential uplift between the two points 

 must be 20 feet or more. The higher of the two Grove Spring beaches 



