

EXPLANATION OF PLATE XI 



MAP OF COLUMBIA GLACIER 



Columbia Glacier reaches the sea at the head of Columbia Bay, one 

 of the numerous arms of Prince William Sound (see plate xm). 



Surveyed by G. K. Gilbert, June 25 to 28, 1899, with use of the 

 plane-table, and with stations about the lower end of the glacier. De- 

 tails about the nunatak are from notes by Charles Palache. 



Drawn by Gilbert Thompson. 



Contour interval, 250 feet. The bay is represented as at high tide. 

 At lowest tide Heather Island is joined to islands north of it by mud 

 flats, and extensive shoals are bared along the northeast coast. 



The glacier is described on pages 7181. It is pictured in plates 

 ix and xii, and in figure 37. 



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