BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 18, pp. 257-286, PLS. 7-23 JUNE 15, 1907 



EECENT ADVANCE OF GLACIERS IN THE YAKUTAT BAY 



REGION, ALASKA* 



BY RALPH S. TARE 



{Read before the Society December 28, 1906) 



CONTENTS 



Page 



Introductory statement 258 



Location and topography of tlie area studied 258 



Previous work 259 



General description of tlie glaciers 259 



Malaspina glacier 259 



Lucia and Atrevida glaciers 260 



Glaciers of Yakutat bay 2G1 



The advancing glaciers 262 



Variegated glacier 262 



Condition in 1905 262 



Condition in 190G 263 



Orange glacier 265 



Turner glacier 265 



Haenke glacier 266 



Condition in 1905 266 



Condition in 1906 266 



Galiano glacier 267 



Condition in 1890 267 



Condition in 1905 268 



Atrevida glacier 269 



Condition in 1905. 269 



Condition in 1906 270 



Contrast with Lucia glacier '. , . 272 



Past and future 272 



Marvine glacier 273 



Previous condition 273 



Condition in 1906 273 



Rapid geologic changes 275 



Change in subglacial stream course 276 



* Published by permission of the Director of the United States Geological Survey. 

 The work on which this paper is based was done in the summers of 1905 and 1906. I 

 take this occasion to acknowledge the valuable assistance rendered in these two expe- 

 ditions by my scientific associates, Messrs Lawrence Martin and B. S. Butler in 1905, 

 and Messrs B. S. Butler, J. L. Rich, O. Von Engeln, and R. R. Powers in 1906. 



Manuscript received by the Secretary of the Society March 4, 1907. 



XXIII — Bull. Geol. Soc. Am., Vol. 18, 1906 (257) 



