This report presents observations made during the summer of 1931 on Mendenhall, Herbert, Taku, and Norris glaciers, in the vicinity of Juneau; Spencer, Bartlett, Trail, and Bear Lake glaciers, north of Seward; Valdez and Camicia glaciers at Valdez; and Sherman, Sheridan, Childs, Miles, Grinnell, and Allen glaciers, tributary to the Copper River.1 Choice of these glaciers was based on accessibility. The locations and relations of the glaciers studied are shown in Figures 1, 5, 10, and 11. Dates of significant observations are given in the captions of photographic illustrations.
The primary purpose of this Alaskan work was the comparison of the shaped and striated boulders produced by river ice during ice jams in sub-arctic rivers with similar boulders produced by modem valley glaciers and with those found in various southeastern States. The latter are thought to be the product of river ice during Pleistocene . . .