45(> C. R. DRYER — FINGER LAKE REGION OF WESTERN NEW YORK 



the existence of others less conspicuous, but perhaps not less significant. 

 They belong to two classes, (1) terminal or valley-head moraines and 

 (2) lateral or valley-side moraines. 



VALLEY-HEAD MORAINES 



Three of the principal valleys terminate in massive moraines which 

 fill them to the height of many hundred feet and widen upward as the 

 valley widens. The summit of each is level with the outwash plain of 

 the Cohocton-Wayland valley. At the head of Canaseraga valley above 

 Dansville the moraine is 3 or 4 miles wide and rises 600 feet in 2 miles. 

 At the head of Hemlock valley above Springwater the moraine is a mile 

 and a half wide and rises 400 feet in 2 miles. At the head of Canan- 

 daigua valley above Naples the moraine is 2 miles wide and rises 600 

 feet in 3 miles. The topography is of a very pronounced knob-and- 

 basin type. These three moraines are contemporaneous. An earlier 

 series is represented for the Hemlock ice lobe by a moraine near Loon 

 lake, 5 miles south of Wayland, and for the Canandaigua lobe by a 

 moraine at Liberty, 4 miles down the Cohocton valley. Members of a 

 later series occur above Scottsburg south of the angle of Conesus valley, 

 at Websters, west of Marrowback hill, in Canadice valley on the south 

 slope of Bald hill, and in the Honeoye valley. The upper Honeoye is 

 choked for 3 miles with a continuous moraine, and at its head two ridges 

 extend across the valley like dams. The west dam is 30 to 50 feet high, 

 and is cut by Springstead brook not at its lowest point but at its highest 

 (figure 1, plate 38). A much more massive and irregular dam a half 

 mile to the east rises 140-200 feet above the valley floor. Both dams 

 rest upon shale which is exposed between and below them (figure 1, 

 plate 40). A similar moraine dam crosses the east fork of Bristol valley 

 at Bristol Springs. In a fourth series belong the moraines of Frost 

 hollow, Berby hollow, and the west fork of Bristol valley. The latter 

 is choked with morainal mounds throughout its length of 4 miles. Of 

 a little later date are heavy deposits in Bristol valley at the forks. 



VALLEY-SIDE MORAINES 



The presence of "quasi-lateral" moraines in the Canaseraga valley 

 was noted by Chamberlin* but he did not report their existence in the 

 other valleys. Honeoye valley and West hollow are separated at their 

 junction by High Point, a narrow precipitous ridge rising 1,000 feet above 

 the Honeoye on the west and 600 feet above West hollow on the east (fig- 

 ure 1, plate 38). At the West Hollow level, between 1,400 and 1,500 feet, 

 a rock terrace one-fourth of a mile wide and 2 miles long extends around 



* Third Report, U. S. Geol. Survey, p. 352. 



