Pre-Wisconsin Drift in Finger Lake Region 15 
at an earlier stage. In any case, the striae, indicate that this slope 
was leeward at least part of the time, hence the subdued erosion. 
In the veneer of drift we note a conspicuous number of very 
weathered stones. These constituents in many instances are 
rotten, going to pieces under a blow of the hammer; others show 
in cross-section a surface altered zone, one-quarter to one-half inch 
wide. Even the pitted quartzite bowlders are not rare. 
Eastern slope of Bluff Point. On this opposite slope of the bluff 
a roadway leading northward from Dunning’s Landing makes 
an exposure of highly weathered material just north of William 
T. Morris’ cottage. This is the only section which suggests a 
concentration of rather uniformly altered drift constituents; 
neither the location nor the weathered condition of this exposure 
necessarily implies old drift. 
About one-half mile south of Dunning’s a recent stream channel 
reveals the contact of two distinct types of drift. The upper hori- 
zon is the familiar Wisconsin which here overlies a semi-indurated 
bluish till. This latter is fresh in comparison with the overlying 
Wisconsin which at this point is about 6 feet thick (fig. 2). 
Northward along this slope a similar arrangement of drifts was 
noted in three places. 
On these steep slopes heavy rains and spring thaws open new 
channels, cutting 10 feet to 15 feet in a few seasons. The Wis- 
consin drift is easily channeled, the other resists erosion more 
effectively. After a few seasons, however, the surface horizon 
weathers and covers the blue till formerly exposed. 
As explained above, the direction of this valley is more nearly 
accordant with the direction of ice-movement; the older drift here 
was exposed, therefore, to more vigorous erosion. The portion 
of this old drift which has survived ice-erosion is the lower, un- 
weathered parts. Thus the old drift is commonly fresher than 
the new. 
The North Croshy exposure. On the opposite shore of the lake, 
a few rods up the hill from the North Crosby Landing, a recent 
stream course discloses a hard bluish till, which shows no evidence 
of structure, overlain by Wisconsin drift. This channel in places 
is 15 feet deep; the maximum showing of the basal drift is about 
