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



basin as was not still buried under the great ice-body. The 

 beaches have been traced in the Huron-Erie basin and along 

 the southern slope of the Erie and Ontario basins into Western 

 New York as far east as the meridian of Rochester. The out- 

 let of the lake was certainly westward into Mississippi drain- 

 age, probably across Michigan into the glacial lake Chicago. 

 The name was given by J. W. Spencer. 



Invasion of Central New York. — The Warren waters 

 existed in the extreme western part of the state, within the 

 Erie basin, for a long time before they were allowed to enter 

 the central part of the state. When the front of the ice bar- 

 rier moved back, northward, from the high ground north of 

 Batavia, Lake Warren extended eastward, as a relatively narrow 

 belt of water, along the east and west ice-wall, with southward 

 prolongations in the valleys. The waters occupied the valley 

 of Oatka Creek to beyond Warsaw ; of the Genesee and Cana- 

 seraga Yalleys to beyond Dansville ;« the valley of Conesus, and 

 ultimately the valleys of Honeoye, Mud Creek (Bristol), Canan- 

 daigua, Flint Creek, Seneca, Keuka (through Seneca), Cayuga, 

 Owasco, Skaneateles, Otisco, Onondaga, and possibly Butternut. 

 The valleys of Hemlock and Canadice were above the Warren 

 level. 



The breadth and southward extent of Warren waters in the 

 valleys of Keuka, Seneca, and Cayuga were less than that of 

 the Newberry waters, as they were about 100 feet lower. The 

 northern boundary, the ice front, was probably much straighter 

 or less lobate than that of Newberry. The glacial border 

 being further north, on the low northern plain, the effect of 

 the Finger Lakes valleys was nearly or entirely lost upon the 

 ice-front, which was probably an arcuate line not far from .the 

 north ends of the present lakes. 



Shorelines and Elevations. — The Warren shore has been 

 traced with sufficient continuity to positively identify it as far 

 east as Lima, south of Rochester, where it has an elevation of 

 879 feet. Well-defined beaches may doubtless be found 

 further east, but the shoreline phenomena already discovered 

 are delta terraces and bars and spits connected with deltas. 

 Like the Newberry phenomena, these have been elsewhere 

 described and need only be mentioned here. 



In the Canandaigua Valley the Warren level appears upon 

 the deltas, but the elevations have not been measured. A 

 fragment of beach has been found southeast of Canandaigua 

 village and one mile west of Reeds corners with elevation of 

 about 880 feet. In the Keuka Valley the Warren level is very 

 evident as the lowest of the strong delta terraces. These vary 

 in elevation from 830 to 870 feet. In the Seneca Valley sev- 

 eral terrace bars have been measured as follows: At Montour 



