I894-] 369 [Stose. 
Mt. Morris would be formed. From partial observation itjappears 
that this gorge is filled by material of more local origin than that 
forming the Portage ridge in the main valley. Not finding 
any records of borings, I have been unable to trace the continua- 
tion of this gorge, the region here being covered by drift hills, 
which rise a hundred feet or more above the general level of the 
plateau. If, on the other hand, we regard this gorge as simply 
a tributary to the preglacial Genesee, we must consider it of late 
preglacial origin, in order to account for its perpendicular sides. 
Summary. 
To briefly siuiimarize, this paper attempts to show the existence 
of two northward, flowing preglacial rivers in western New York, 
parallel to the Seneca, Cayuga, and other rivers, whose vallevs 
are now occupied by the waters of the Finger Lakes. These two 
rivers were the Caneseraga and the Genesee. Drift deposits 
compelled the Genesee to leave its ancient channel at Portageville 
and to cut across the intervening plateau to Mt. Morris, from 
which point it occupied the channel of the Caneseraga. Owing 
to drift deposits at Dansville, this latter stream lost a large part 
of its head waters, in consequence of which it d^vindled, and 
virtually became a tributary to the Genesee. Finally is noted 
the existence of a lateral drift-filled gorge, which was either 
formed by a late preglacial tributary, or was of interglacial origin, 
temporarily re-establishing the northward drainage of the Genesee 
by way of Warsaw after the filling of the valley at Portage. 
Note. — I take pleasure in acknowledging my indebtedness to 
Miss H. E. Freeman, for valuable assistance in the prosecution 
of the field work. 
A SPECIMEX OF CERATIOCAPtIS ACUMINATA HALL 
FROM THE WATER LIME OF 
BUFFALO, N. Y. 
BY G. W. STOSE. 
The only specimen of this species previously recorded is a 
carapace described by Professor Hall in volume 3 of the 
paleontology of New York. 
PROCEEDINGS B. S. X. H. VOL. XXVI. 24 AUG. 1894. 
