A Form of Outwash Drift 
51 
tory of the uplands or divide areas between these northward open- 
ing troughs. This fact taken in conjunction with the one just 
mentioned, that is, when the topography favors free movement 
from the major lobe, thus directing thitherward more active ice 
with this load of debris, will give us the conditions that account for 
the peculiar localization of the drift of the area under discussion. 
DESCRIPTION OF THE DRIFT IN QUESTION. 
A detailed study of this particular interlobate outwash material 
reveals the following facts: (i) The ice-contact face is not accen- 
tuated, that is, there is no cliff or terrace to suggest the speedy 
withdrawal of the ice from a position of long halt; (2) the northern 
part of the accumulation presents a subdued morainic surface; 
(3) rather numerous bowlders may be seen, some of which are the 
largest noted in the region. To the southward, however, this 
morainic topography gradually blends into a normal outwash slope. 
The control exercised by the falling contours of the rock slopes 
both east and west, is manifest in the expanding outwash when con- 
sidered in connection with the moraine to which it belongs, and 
in the gradual falling contours of the outwash, i. e., this develop- 
ment of drift has something of a saddle form. Judged from the 
surface appearance — there is an absence of sections — the outwash 
material is entirely normal; there is a blending distally form coarser 
to finer sediments, with a few bumps suggestive of kame topography. 
Proceeding southward from this area along the east slope of 
Bluff Point, one traces a very sharp lateral moraine marking the 
position of the valley tongue which occupied the Penn Yan arm 
of the lake contemporaneously with the building up of the out- 
wash. This band of lateral moraine may be traced without a 
break until it disappears beneath the surface of the lake at a 
point a little south of Ogoyago. The counterpart of this band of 
drift on the eastern wall of the Penn Yan branch has not been 
traced continuously. It has been picked up, however, along the 
highway directly west of Warsaw, also to a point northeast of 
Crosby, and continuously traced where it makes the angle around 
the divide west of Himrods, blending then into marginal drift of 
the Seneca valley lobe. 
