176 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. 



