H. L. Fair child — Glacial Lakes in Central New York. 261 



that has left any strong shoreline phenomena, so far as at 

 present observed. Theoretically its evidences should be found 

 from Marcellus westward throughout the Ontario and Erie 

 basins, and it may be the subject of much future study. A 

 distinctive name is required, and it is proposed to call the 

 water Lake Dana, after Professor James D. Dana, the early 

 leader in American glacial geology. 



Since the publication of the former description the beach has 

 been traced south from Geneva to near Dresden, and shoreline 

 phenomena have been observed in the Cayuga Yalley at a 

 theoretically corresponding level. The elevations in the 

 Seneca Yalley are as follows : near Angus station, Fall Brook 

 railroad, 671 feet; near Earle's station, 679 feet; west of 

 Geneva, 700 feet ; south of Phelps, 713 feet. The deforma- 

 tion of the beach is about three feet per mile, on north and south 

 line, and it lies 180db feet under the Warren plane. Evidences 

 of this lake should be found throughout the valleys of Cayuga 

 and Seneca and westward at 170 to 190 feet under the Warren 

 level. This water could not occupy the valleys of Keuka, 

 Owasco, Skaneateles, nor Otisco, as these lie above its plane. 



The magnificent Cedarvale channel, with its huge delta, has 

 been described in another writing (see reference, p. 256). It 

 heads on Corniferous limestone and shale, one-fourth mile 

 southeast of Marcellus village, with an average elevation of 

 691 feet, which elevation correlates well with the beach alti- 

 tude of the same parallel, something over 700 feet, making 

 allowance for depth of water over the sill and the later down- 

 cutting, with some east and west deformation of the land. 



The change from the Warren level to the Dana level did not 

 come by the slow down-cutting of the head of the Gulf chan- 

 nel, but by the recession of the ice front so that the glacial 

 waters abandoned that outlet and found free access to the 

 Marcellus valley from the north. 



The eastern limit of Lake Dana was practically the same as 

 that of Lake Warren, but with a surface 180 ± feet lower. Its 

 southern margin must have been more contracted, while the 

 ice boundary upon the north was somewhat further removed. 

 Its western limits have not been determined, but phenomena 

 attributed to this water have been observed as far west as the 

 Genesee Eiver. Without some unexpected barrier, like great 

 land elevation or far readvance of the ice sheet, there seems no 

 escape from the conclusion that Lake Dana must have covered 

 the Erie basin. Being weak as compared with the Warren 

 phenomena, these have been overlooked, but it is predicted that 

 they will be found westward over a wide area. The hypo- 

 thetical shoreline is indicated on the map. 



