28 The America?i Geologist. July, imj 
changing until finally, when the ice-front came to a stand on 
the Port Huron-Saginaw moraine, a permanent outlet was 
established close along the foot of the ice in the angle. The 
main head branch of this channel begins about two miles east 
of the village of Ubly and after running two miles northwest 
turns sharply in the angle of the moraine and passing close 
west of Ubly, extends thence i8 miles southwest to Cass City, 
where it entered lake Saginaw another glacial lake, which 
filled the Saginaw valley. This channel is about a mile wide 
and has drift banks 20 to 100 feet high. The beach of lake 
Whittlesey is called the Belmore beach and in Ohio, is about 
160 feet above lake Erie, or something like 40 feet lower than 
the Leipsic* "It is well defined as far as Sheridan, New York, 
and may possibly continue to Hamburg, though the beach is 
apparently less definite than west from Sheridan. From Ham- 
burg eastward, so far as has yet been discovered, this beach has 
no continuation. "t The Gowanda moraine probably crosses 
its level at Sh.eridan. The Leipsic beach, next higher, has not 
been found east of Euclid. A demonstration of its disappear- 
ance in that direction would agree with the fact observed in 
Michigan that the lake level began to fall soon after the ice 
commenced to retreat from the Detroit-Euclid moraine. 
Lake l'Varrc?i. When the ice withdrew from the Port Hu- 
ron moraine, a wide passage around the end of the thumb was 
quickly opened; lake Whittlesey fell and blended with lake 
Saginaw, and the outlet of the latter lake through the Grand 
river channel became the outlet of lake Warren. 
The Grand River channel is the most magnificent outlet di- 
rectly associated with this series of lakes. It is a mile wide and 
50 miles long and in some places it is more than 200 feet deep 
in drift. The beach of lake Warren is the Forest or Crittenden 
beach. J In Ohio and eastward it is compound in form, being 
*"Belmore" is the name used by Winchell, and designates the same 
beach as Gilbert's No. 3. This beach in Michigan is Spencer's "Ridge- 
way." and east of Cleveland into western New York it is Gilbert's 
"Sheridan." The tracing is not yet continuous for the whole length 
of the line, but the identifications seem to admit of no serious doubt. 
fMr. Leverett, in a letter in Am. Geol., vol. XXI, March, 1898, p. 
197. 
Jin southwestern Ontario, Dr. Spencer traced a beach which he 
called the "Forest," and he afterwards identified its counterpart in 
Michigan. (Am. Jour. Sci., vol. XLI, March, 1891.) Mr. Gilbert 
traced a breach from Cleveland into western New York, to which he 
