GENESEE AND HEMLOCK VALLEYS 35 



is to be made to the former description. At least one stage of the hyper- 

 Iroquois waters has been recognized in the Genesee valley (see page 57). 

 In the enumeration of the Genesee lakes this should be inserted after 

 lake Warren as the ninth stage waters and called lake Dana. 



Canaseraga Valley 



For the description of the glacial waters of this valley see the former 

 paper, " Glacial lakes of western New York," page 358. 



CoNESus Valley 



For the description of the glacial waters in this valley see the former 

 paper, " Glacial lakes of western New York, page 360. 



Hemlock Valley 



Hemlock lake, the source of Rochester's water suppl}^ is the successor 

 of the ancient lake. The village of Springwater lies two and one-half 

 miles south of the head of the lake and not far above its level. The 

 side walls of the valley rise 800 to 900 feet above the lake, which has an 

 elevation of 896 feet above tide, with the steep smooth sldpe character- 

 istic of the ice-moulded valleys of the Finger lakes region. At the 

 level of the former glacial lake surface the valley has a width of about 

 one mile. 



The only stream of note in the valley is the inlet creek, which has its 

 origin near the divide, about one mile north of the village of Wayland. 

 Some wet-weather streams along the sides of the valley have left incon- 

 si)icuous deltas. 



The moraine in the head of the valley extends from Springwater to 

 Wayland, a distance of about four and a half miles. At the divide the 

 drift is mainly gravel, although the topography is typically morainal. 

 The water parting is near the east-and-west town-line road, nearl}^ one 

 mile north of Wayland, with an altitude of about 1,400 feet, taking the 

 Erie railroad at Wayland as 1,387. The surface here is irregular, with 

 kettles and small swamps. There is no swamp col and the water chan- 

 nels are narrow and tortuous, opening through Wayland into the broad 

 channel south of the village where the Cohoctou creek has its source. 

 The later and more important outlet is on the west side of the valley. 



An interesting feature of the Wayland localit}'^ is the extensive plain 

 immediately south. This is one mile wide and extends southeastward 

 from Perkinsville, several miles beyond Wayland. Much of the surface 

 is underlaid with marl, which furnishes the basis of the famous Wayland 



VI— Bui.i,. Geol. Soc. Am., Vol. 10, 1898 



