JOUGIEILL C/A TH OIN Sy 349 
the use of many who are not specialists in the sciences to which the 
essays especially relate. The maps are very valuable, but the volume 
is otherwise but slightly illustrated. 
a IR, ID). oS. 
Post-GLACIAL SUBMERGENCE IN THE REGION OF THE 
GREAT LAKES. 
Raised Beaches of Lake Michigan. FRANK LEVERETT. (1889) 
Wisconsin Academy of Science, Vol. VII., 83-87. 
Abandoned Shore-lines of Green Bay. By F. B. Taytor. Ameri- 
can Geologist, Vol. XIII., May, 1894. 
Abandoned Shore-lines of the South Coast of Lake Superior. By 
hi B. DAvvor. American Geologist, Vol, XUN, June, 13894. 
Coastal Topography of the North Side of Lake Superior. By A. C. 
Lawson. (1893) Twentieth Annual Report of the Geolog: 
ical and Natural History Survey of Minnesota for 1891, 
PPa Ls 2.80; 
Ancient Strait at Nipissing. By F. B.Taytor. Bulletin Geologi- 
cal Society of America, Vol W:, 1803: 
Limit of Post-Glacial Submergence in the Highlands East of Georgian 
Bay yaks BD AvwOR. = American Geologist, Wolly XnVe, 
November, 1894. 
Lhe Duration of Niagara Falls. By J. W. SPENCER. American 
Journal of Science, 3d Ser., Vol. 48, p. 455, December, 1894. 
The investigations by various observers within the last five or six 
years have added greatly to our knowledge of the Pleistocene history of 
the Great Lake region. Following is a brief summary of the results 
of these observations.. Mr. Leverett’s paper deals with the raised 
beaches and sea cliffs around the head of Lake Michigan. Three 
distinct beaches are recognized which are continuous and traceable for 
a long distance. These are designated the Upper, Middle and Lower 
raised beaches. Between Waukegan and Winnetka, Illinois, the lake is 
farther west than when the beaches were formed and is gradually 
encroaching upon thetill-covered country beyond. At Winnetka the base 
of a sea cliff twenty feet high lies sixty feet above the level of Lake 
Michigan (641). Southward the cliff becomes continuous with the 
tFor convenience the elevations referring to sea level are placed in parenthesis. 
