350 LTE i OCLINALE VOR MGT OL O GNA 
upper beach of gravel and sand which maintains an altitude of sixty feet 
to within a short distance of the Chicago River where it decreases to a 
height of forty feet (621). At La Grange there is another sea cliff with 
its base forty-six feet above the lake. At the time this beach was 
formed, the lake had an outlet down the Des Plaines valley at Summit, 
and another entered the same valley from the east at The Sag, about three 
miles below. The depth of water passing through this outlet at the 
time this higher beach was formed was forty or fifty feet. East from 
Summit, the beach ridge stands at sixty-five feet near Homewood (646), 
fifty-five feet near Glenwood, and eastward to Dyer, in Indiana (636). 
The middle beach is about twenty-five feet below the upper, and 
the lower beach ten feet below this. 
Beginning at Sheboygan, Wisconsin, Mr. Taylor’s observations 
extend northward along the western shore of Lake Michigan. The 
greatest submergence noted is not considered by this author to be 
represented by any of the terraces described by Mr. Leverett. Evi- 
dence of submergence was found at Kewaunee in a low terrace fifteen 
to twenty feet above the lake (601). Northward the corresponding 
beach lines rise gradually, and at Menominee on the west coast of 
Green Bay, there is a well marked beach ridge fifty feet above the lake 
(631). On the north shore of Green Bay several beaches are dis- 
tinguished, the highest being 135 feet above the lake (716). North- 
ward from Brampton the general appearance of submergence seemed 
to extend some distance north of Lothrop, which is 460 feet above the 
lake (1041), but no shore line was seen. At Marquette a strongly 
developed shore was found at 590 feet above Lake Superior or 1191 
feet above sea level. There is thusseen to be a depression in the beach 
lines in the vicinity of Kewaunee, north of which the rise is about 
eight inches per mile for seventy-three miles, while the succeeding 
sixty-three miles have a rise of from two feet two inches to two feet 
four inches per mile. Compared with the eastern shore of the lake, 
the beach on the west appears to be about twenty to thirty feet lower 
in the same latitude. 
Along the south shore of Lake Superior the line of submergence 
ranges from 572 feet above Lake Superior at Duluth (1173) to 630 
feet at Marquette (1231), decreasing from this point eastward to 452 
feet at Sault Ste. Marie (1053) (Lawson). The suggestion is made that 
during the great submergence the Superior basin connected with 
Hudson Bay by one or more straits. 
