122 



National Geographic Society. The author is indebted to 

 Mr. Henry Gannett, chairman of the Research Committee 

 of the National Geographic Society, for permission to re- 

 produce the accompanying copyrighted topographic maps 

 of Hidden glacier, Nunakak glacier and of Turner, Hub- 

 bard and Variegated glaciers and some of the photographs 

 which are from the book of our investigations for the 

 Society on the Yakutat and Glacier Bay regions. 



ANNOTATED GUIDE. 



o.o m. Juneau — Leaving Juneau the steamer pro- 



o.o km. ceeds westward across the lower end of Lynn 

 canal toward the entrance to Icy strait, but in 

 so doing it follows a somewhat devious course 

 around various points and islands. 

 70 m. Icy Strait — The route continues through Icy 



112 km. strait, which has a northwesterly trend. At 

 the junction of this fiord with Lynn canal there 

 is a discordant submarine step, Icy strait hang- 

 ing above Lynn canal because of superior glacial 

 erosion in the latter. The bottom of Icy strait 

 slopes eastward toward Lynn canal from the 

 Glacier Bay submarine divide, to the west of 

 which the bottom of Cross sound slopes west- 

 ward to the Pacific ocean. 



Something may be seen here of the fish traps 

 for collecting salmon. 

 105 m. Entrance to Glacier Bay — Continuing 



168 km. through Icy strait, the entrance to Glacier bay 

 is reached 105 miles (168 km.) from Juneau. 



THE GEOLOGY AND PHYSIOGRAPHY OF 

 GLACIER BAY. 



Rock Formations. 



The rocks in the vicinity of Glacier bay are shown by 

 the studies of H. F. Reid, [62, 63], H. P. Cushing [24], and 

 F. E. and C. W. Wright [88, Plate II], to be argillites, 

 slates, and limestones, of Paleozoic (perhaps Carboniferous) 

 age, with diorite and other igneous rocks of Jurassic, Cre- 

 taceous, or later age. 



