1 8 The Anicrica7i Geologist. July, isto 
Michigan series is the Toledo and the next in Mr. Leverett's 
series is the Newbiirg in the southern part of Cleveland. It 
can hardly be doubted that these are parts of one moraine. At 
Newburg the moraine begins to descend westward to one of 
the beaches and soon fades away in the old lake bed. It has 
not been traced toward Toledo, and the character of the inter- 
vening country suggests that it may not be possible to follow 
it. In this case, however, not only does our scheme of correla- 
tion suggest the union of these two parts, but the completion 
of the Toledo moraine in Ohio by extension from Michigan 
in accordance with the laws of the adjustment of the ice-sheet 
to topography would plainly carry its front around in a great 
curve from Toledo towards Cleveland. Toledo is on the axis 
of the basin and such a curve is required to complete the sym- 
metry of the lobe in conformity to the symmetry of the basin. 
It seems certain, therefore, that the two ice streams were 
blended into one lobe at the Toledo moraine also. At this 
time the ice-dam was about 230 miles long and stood at To- 
ledo in water which was nearly 200 feet deep. 
The Detroit-Euclid Dam. At its next position in Michigan 
the ice-front stood at the Detroit moraine, and this appears to 
be the correlative of Leverett's Euclid near Cleveland. In 
this position the ice-dam made a more direct line across the 
basin and so was probably not over 200 miles long. The 
direction of the Detroit moraine seems to indicate quite clearly 
that at this stage the two ice streams were not united in one 
symmetrical lobe-front, but were simply in contact along their 
contiguous edges for 70 or 80 miles. The Detroit moraine, 
after crossing to the southeastern part of Essex county, Ont., 
runs northeast along the north shore of lake Erie and south of 
the Thames river to London. Ont., where it turns directly 
north for about 75 miles. The course of the Euclid moraine in 
crossing the bed of lake Erie is not known, but in all proba- 
bility runs west from Cleveland, curving around gradually 
towards the north so as to meet the Detroit moraine some- 
where south or southeast of lake St. Clair. From this point to 
London the lobes were in contact and probably more or less 
blended. But at London the moraines separate, the Detroit 
passing north, as just stated, around the west side of the high- 
lands south of Georgian bav, while the Euclid moraine was 
