i 7 6 
ALASKA GLACIERS 
for the greater volume of the side glaciers when the trunk 
glacier filled the fiord, I have indicated the profile of the 
trunk glacier by a dotted line (ab). The inclination of 
this line from the horizontal is about 2°, or one in twenty- 
five. Its height above tide ranges from 2,800 to 4,800 feet, 
and it indicates a thickness of ice exceeding these figures 
by the depth of the fiord, whatever that may be. In the 
line of Gannett’s suggestion, a second tentative profile 
(cd) is drawn in similar relation to the crests of the lower 
series of cascades. 
The depth of ice indicated by the hanging valleys is 
somewhat less than that which would be inferred from 
the rounding of projections, and it seems probable that 
the epoch during which the hanging valleys received 
their principal sculpture was not the epoch of maximum 
glaciation. 
A cordon of high hanging valleys surrounds Harriman 
Fiord. Above Barry, Serpentine and Surprise glaciers 
they contain hanging glaciers at a general height of about 
4,000 feet, and east of Harriman Glacier their ice banks 
coalesce in a continuous terrace along the valley wall (page 
95). The surface of the trunk glacier to which they are 
adjusted probably lay 5,000 feet above present sea-level. 
On the north side of Montague Island and at various 
points on the peninsulas of the east and west sides of the 
sound, a horizontal terrace was observed, at an estimated 
height of 50 to 75 feet above tide. No near view was 
obtained, and I did not learn its character. 
As the Pleistocene glaciers extended at least to the 
outer coast line, as their work of erosion was great, and 
as their limit is not indicated by conspicuous moraines, the 
provisional inference is made, as in the discussion of the 
Alexander Archipelago, that the ocean surface was com¬ 
paratively low at the time of their greatest expansion and 
that their outer moraines are now submerged. 
