50 
Frank Carney 
north-south axis of Bluff Point, and the drift of our triangular area 
(fig. i) in process of construction. 
Along the margin of these valley lobes drift ridges, often widen- 
ing into morainic areas, were being formed. The uniformity of 
such ridges as traced by Tarr on the Watkins quadrangle has 
suggested the characterization, ‘^almost diagrammatic in their 
simplicity.”^ Each such moraine is indicative of stability in 
the reach of a valley lobe. Two contiguous valleys as those of 
Keuka and Seneca lakes would give us contemporaneously formed 
contouring moraines. The particular form assumed by the glacial 
debris at the angle of two such contiguous moraines will depend 
in the first place upon the northward slope of the divide; in the 
second place, upon the debris melted out of the ice at this particu- 
lar point; and, in the third place, upon the amount of glacial drain- 
age diverging at this point, carrying the material thus melted along 
the margin of the valley lobes. 
From a study of these intertrough divides of the Finger Lake 
region, it is noted that their northward slope is gradual. The 
normal condition then of drift where the lateral moraines of two 
adjacent lobes unite reveals no special thickening. Where, how- 
ever, the slope of the divide in question is steepened, and the ice 
immediately northward is perhaps more stagnant, or where it 
contains less debris, then we would anticipate a tendency toward 
the general removal of such debris, and the axis of the slope or 
divide would have less than the normal veneer of drift. On the 
other hand, when the axis of the northward slope is more in line 
with the general deployment of the ice, the chances for the accumu- 
lation of drift will certainly be enhanced. It should be noted that 
the northern part of the longitudinal axis of Bluff Point does trend 
to the east quite in unison with the direct deployment of ice from 
the Seneca lake lobe. This being the case then, we have the 
hypothetical conditions favorable to an assemblage of debris in 
the triangular area. 
There is, however, still a further factor that favors accumulation 
of the drift, which is operative when the divide flattens immediately 
to the north, a topographic relationship due to the drainage his- 
^ Bull. Geol. Soc. Am.^ vol. xvi, p. 218, 1905. 
