214 Glaciation of Mountains^ etc. — W. Upham. 
ice-border might deviate considerably from its former course. 
A large indentation of the ice-sheet seems then to have been 
formed within the Gulf of Maine, turning the latest glacial 
movements in the vicinity of Boston, as indicated by the 
trends of drumlins, toward the southeast and east-southeast. 
During the continued retreat of the ice this indentation prob- 
ably extended across York county, in the southAvest corner of 
Maine, coinciding approximately with the Saco and Ossipee 
rivers. Remarkably deflected strife are found on each side of 
this tract, on the northeast being turned southwesterly toward 
it in Cape Elizabeth, Standish, and Brownfield, Maine, and on 
the top of Mt. Pleasant ; while on the southwest they are 
turned easterly and even to the north of east toward it in the 
district east of Winnipiseogee and Squam lakes.' 
After the departure of the general ice-sheet, local glaciers 
lingered, during probably only a short time, in deep valleys 
and ravines of the mountains. Indeed, at the present time 
the summer snow-arch in Tuckerman's ravine shows that a 
glacier would be formed there by slight changes in meteorolo- 
gic conditions favoring glaciation. Notes of the strife and 
morainic deposits of these alpine glaciers, and of the remnants 
of the ice-sheet itself, with local deflections of its currents 
during its dissolution within the mountain districts, are pre- 
sented by professor C. H. Hitchcock in the reports on the 
geology of New Hampshire and Vermont, partly from his own 
observations and partly as observed and originally described 
by Agassiz, Vose, and Packard. The Androscoggin valley 
contained one of the most noteworthy local glaciers of the 
White mountains, by which a remarkable terminal moraine, 
described by professor George H. Stone, was formed across 
the valley on the boundary between New Hampshire and 
Maine. 
Looking beyond the limited region that has been the theme 
of this essay, we may well glance again in closing, over the 
vast glaciated area of this continent. Nearly all the snow-fall 
forming the ice-sheet was brought by winds from the evapor- 
ated surface of the sea in temperate and tropical latitudes ; 
and Dana and McGee were first to reach the conclusion, since 
established by observations about Hudson strait and ba}' and 
on the head- waters of the Yukon, that the moisture of the 
' Geology of New Hampshire, vol. in. pp. 122, 194. 
