24 



THE NATIONAL GEOGRAPHIC MAGAZINE 



MAP OF PART OF ALASKAN COAST (aPTER U. S. GEOLOGICAL SURVLy) 



Showing glaciers of lower Copper River. The water at the delta is so shallow that the 

 terminus is at Cordova to the west. There are valuable coal fields between Berino- and Martin 

 River glaciers and rich copper deposits north of the Chugach Mountains (see pages 13 and 37) 



mote reservoirs. The entire phenome- 

 non of advancing glaciers as a resuU of 

 earthquake shaking is so little known that 

 it is difficult to accurately predict results, 

 and consequently it is highly important to 

 maintain observations so that this novel, 

 and interesting phenomenon may be more 

 thoroughly understood. 



LUCIA GLACIER HAD BECOME IMPASSABLE' 



The second glacier that has been 

 brought under the flood impulse since last 

 seen in 1906 is the Lucia glacier, which 

 lies next west the Atrevida, and whose 

 lower, stagnant end coalesces with the 

 Atrevida glacier. The expedition of 

 1906 crossed the Lucia glacier from west 



to east in order to study the western mar- 

 gin of the Atrevida glacier, which had be- 

 come so crevassed between 1905 and 1906 

 that it could no longer be crossed. The 

 Lucia was then in the same condition as 

 when crossed by the junior author in 

 1905 and by Professor Russell in 1890 — 

 that is, the Lucia glacier, fed by many 

 tributaries, emerged from its mountain 

 valley as a partly moraine-covered glacier, 

 with so little crevassing that it could be 

 easily traversed in any direction. Beyond 

 the mountains it expanded into a pied- 

 mont bulb covered with moraine, and its 

 outer margin was so stagnant that it was 

 covered by a dense growth of alder and 

 Cottonwood. On the western side, near 



