Great Ice-Daujs. — Taylor. 15 
The Eric-Huron Series. In exploring the "thumb" of 
Michigan in 1896, the writer found three moraines in series 
in the area west and northwest of Port Huron.* All the mo- 
raines of southeastern Michigan and northern Ohio show a 
marked change in character below a contour of about 200 
feet above the lake. They have the ordinary rolling topog- 
raphy of landlaid moraines above that level, but below it they 
are all much subdued in their relief. Some are so flat and 
wide that their existence as a ridge is hardly noticeable, but 
even then their influence upon the drainage is very marked in 
most cases and this circumstance is a help in tracing them. 
Their subdued expression below 200 feet is due to the fact that 
they were laid down at the edge of ice-lobes standing in the 
water of the glacial lakes. The three moraines referred to 
all become waterlaid southward from the parallel of Port 
Huron. One of them runs southeast from the vicinity of 
Marlette and turns south past Imlay City on the east. South- 
ward it becomes waterlaid and much subdued, but was faintly 
traceable passing about ten miles west of Mt. Clemens and 
fifteen miles northwest of Detroit and on nearly to Toledo. 
Its course points to Toledo as being at or near its apex, and so 
it has been called the Toledo moraine. On noting the rela- 
tion of this moraine to those next west of it, it was found that 
in the southeast corner of Michigan, where the relations are 
plainest, the next one on the west is the Defiance moraine 
which passes through Adrian. 
Near Port Huron the next moraine east of the Toledo was 
found well developed in landlaid form running south past the 
east side of the village of Yale. Thence it runs south close 
west of Mt. Clemens to the city of Detroit and there crosses 
the Detroit river to the southern side of Essex county in 
Ontario. This has been called the Detroit moraine. 
The next moraine near Port Huron is one that occupies a 
very prominent position. It skirts the entire shore of the south 
arm of lake Huron and Saginaw bay and is strongly developed 
and clearly separated from the other moraines of the region. 
*"Correlation of Erie-Huron Beaches with Outlets and Moraines 
in southeastern Michigan." Bull. G. S. A., vol. 8, 1896. This paper 
gives an account of the beaches, outlets and moraines on the "thumb" 
and in the Saginaw valley, and is accompanied by a map. 
