494 FRANK CARNEY 
the hills mentioned by Wright,' a terrace of the aggradation type 
reaches half-way up the valley wall; it gradually descends eastward, 
where it becomes more irregular both because of initial distribution 
and of subsequent weathering. The line of demarkation between 
this drift and the upward slope is sharp. 
The main body of ice, while the tongue reached eastward, main- 
tained a position nearly north-south for a few miles each way from 
Wilkins Run. North of this place, so far as Mary Ann Township is 
concerned, the retreat of the ice-front appears to have been rapid, and 
there is no evidence that the valley lobe maintained intermediate 
positions; but the old valley becoming broader southwest of Wilkins 
Run encouraged a tongue-like extension of ice at the next halt of the 
ice-field; the well-developed valley train already mentioned was 
formed at this time. 
At Hanover.—Here we have a much wider valley than the case 
just cited. The tongue of the ice reached about six miles eastward 
from the main body of ice. ‘The maximum position of this valley 
dependency is marked by typical morainic topography (Fig. 5), 
with a contemporaneous deposition of drift against the side walls of 
the valley, which above the glacial débris are veneered with rock 
decay in situ. .The line of demarkation between this drift and the 
valley wall is shown very conspicuously on the Hagerty farm south- 
east of the 216-foot well (Fig. 3). The drift, judged from surface 
appearance, especially east of the Muskingum County line, is rather 
bowldry; no very large bowlders were noted, but their fewness may be 
accounted for by the fact that the area has long been under cultivation. 
This tongue-like extension of the ice maintained its distal position 
for some time, but in comparison with the duration of retreatal posi- 
tions the period was proportionately brief. At the second halt the 
alignment of the drift suggests a tapering of the ice-tongue; this 
form, however, is not seen in the other halts (Fig. 3, H. 3, 4, etc.), 
because of the contraction that exists in the valley in the vicinity of 
Hanover. So long as the ice fed actively through this narrow part 
it broadened some in the wider segment of the valley beyond; only in 
this latter area should we expect to find evidence of tapering as the 
ice-movement weakened. 
Loc. cits, ps 755. 
