H. L. Fair child — Glacial Lakes in Central New York. 253 



The ice was probably thicker in the deeper and broader valleys 

 of Seneca and Cayuga, and the general direction of the retreat- 

 ing front of the great ice body was probably convex toward 

 the south, and for our theoretical discussion may be regarded as 

 normal to the axes of the divergent valleys. 



Since the glacial lakes were drained the beaches have been 

 thrown out of horizontal position by a differential northward 

 uplift that has affected the entire Laurentian area. It is there- 

 fore evident that during the life of the glacial lakes the alti- 

 tude of Central New York was much less than now, and that 

 the depression was progressively greater toward the north or 

 somewhat east of north. 



Earlier Local Glacial Lakes. 



As the front of the ice sheet melted back upon the north of 

 the divide, the larger valleys in Central New York were occu- 

 pied by important local lakes, which had their overflow across 

 the divide into southern drainage. These lakes have been 

 described with some detail in former papers by the writer.* 

 For the present purpose it will be sufficient to enumerate the 

 lakes and briefly state their location and relationship. 



The glacial Honeoye occupied the valley of that name and 

 sent its overflow into the Canandaigua Valley. At an earlier 

 time the Honeoye Yalley was flooded by the Canandaigua 

 waters (Naples Lake). 



The Naples Lake was the earliest glacial water in the Canan- 

 daigua Yalley, with its outlet across the divide at the head of 

 the valley, near Atlanta station. Subsequently a lower escape 

 was found across the eastern border of the basin into the Flint 

 Creek Yalley and the. waters became tributary to those in the 

 Keuka Yalley (Hammondsport Lake). This later phase of the 

 Canandaigua waters is called the Naples-Middlesex Lake. 



The Italy Lake occupied the upper Flint Creek Yalley and 

 overflowed at the head of the valley into Naples Lake. A 

 lower stage of Flint Creek Yalley waters, the Potter Lake, 

 has not been fully studied at the time of this writing. 



The Hammondsport Lake occupied the Keuka Yalley. This 

 valley had a lake history similar to that of the Canandaigua. 

 The early phase of the Hammondsport Lake had its outlet 

 south through Bath village. A later phase had its outlet 

 across the eastern rim through the village of Wayne, but ulti- 

 mately to the Cohocton Creek, like the earlier phase. 



* Glacial Lakes of Western New York, Bull. Geol. Soc. Amer., vol. vi, p. 353 ; 

 Genesee Glacial Lakes, ibid., vol. vii, p. 423 ; Lake Warren Shorelines in Western 

 New York and the Geneva Beach, ibid., vol. viii, p. 269 ; Glacial Waters in the 

 .Finger Lakes Region of New York, ibid., vol. x, p. 27-68. 



