403 
[De Geen 
.S92.J 
On summit east of Grand Traverse Bay, Mich. 
(Rominger) 1,682 feet. 
W. from Collingwood at the Niagara escarp- 
ment 1,200-1,425 “ 
At Dog Lake (H. Y. Hind) 1,425 “ 
In Potter County, western Penn., a low gravel- 
ridge 1 2,660 “ 
At the upper Potomac, terraces with 
rounded boulders (I.C. White) 
Nachvak in Labrador (R. Bell) 
In Vermont (Hitchcock) 
1,675 
1,500-2,000 
2,300 
From erratics on the top of Mount Washington, 6,300 feet, 
and on Mount Ktaadn, 4,400 feet, the author concludes that 
the subsidence extended so far and was greater there than in 
Labrador. 2 
F. J. H. Merrill gives in his post-glacial history of the Hudson 
River valley 3 the heights of several delta deposits and plains 
which he considers marine : — 
At New York 
80 feet. 
Mouth of Croton River 
100 “ 
Peekskill 
120 “ 
West Point 
180 “ 
Fishkill 
210 “ 
Schenectady 
340 “ 
As some of the above figures seem difficult to reconcile, and as 
the marine origin of several of the deposits seems also questionable, 
I have thought it useful to make another series of observations, 
and have employed the same methods which I used in Scandi- 
navia. 
Perth Amboy. 
During a short visit made in company with Professor Smock 
to Perth Amboy, southwest of New York city, just where the 
great terminal moraine reaches its southernmost point in this 
1 Considered a kame by H. Carvill Lewis. 
2 It may be mentioned here that the silt and terrace deposits, 3,000 feet above sea 
level, which Spencer mentions from Norway as proof of an analogous great submer- 
gence, are certainly not of marine origin, and are most probably analogous to the 
“parallel roads” in Scotland. They are known in many localities in the higher valleys 
of Norway and Sweden, but there is not one Scandinavian geologist who considers 
them as marine ; the well marked marine area is much lower. 
3 Amer. journ. science, Ser. 3, Vol. XLI, June, 1891, p. 462. 
