t)e Geer.] 
462 
[May iS, 
and sediments of supposed late glacial age and marine origin, the 
opinions of different authors have been much more divergent. 
As examples of this diversity of opinion the following figures 
may be quoted ; a few only refer to shell localities. 
In his Manual of Geology J. D. Dana mentions for the highest 
marine deposits : — 
South of New York, seldom over 
10-15 feet. 
At Brooklyn, Long Island 
100 
In southern New England 
30-35 “ 
In Maine not more than 
200 
At Lake Champlain 
468 
At Montreal, above Lake St. Peter 
470 
In Barrow’s Straits 
1,000 
In N. S. Shafer’s paper on Recent changes of level in Maine 
(1874) we find for 
New York City 
Deer Isle in Maine at least 
Belfast “ about 
Between Milbridge and Machiasport at least 
At Labrador “ “ 
On the Greenland coast “ “ 
a few feet. 
200 “ 
250 “ 
100 “ 
1,000 “ 
2,000 “ 
The same author in later papers assumes for 
Nantucket Island (1889) at least 300 feet. 
Cape Ann (1890) 130-150 “ 
Mount Desert (1889) 1,300-1,500 “ 
W. Upham mentions in the appendix to Wright’s work on 
the Ice Age in North America (1889) for 
Boston and northeast to Cape Ann, probably not 
more than 10-25 feet. 
Maine (Stone) about 225 “ 
Nova Scotia and Cape Breton Island wanting. 
Bay Chaleur (Chalmers) not more than 200 feet. 
Opposite Saguenay (Chalmers) 375 “ 
Montreal (J. W. Dawson) 520 
About 130 miles W. S. W. from Montreal (J. W. 
Dawson) 440 “ 
J. W. Spencer in a paper on post-pleistocene subsidence vs. 
glacial dams (1891) claims as marine and as belonging to the 
same submergence all the beaches and terraces along the great 
lakes, as : — 
