188 THE ICE AGE IN NORTH AMERICA. 



run in more or less parallel lines, and are not always horizontal, 

 but deviate slightly up or down/' * 



Mr. Robert Brown, whom we have already quoted, gives 

 the following additional information as to regions still far- 

 ther north : 



I have not been in Alaska proper, but in 1866, in a visit to 

 the Queen Charlotte Islands, lying some thirty or forty miles 

 off the northern coast of British Columbia, close to the southern 

 boundary of the former Territory, marks of the northern drift 

 quite as marked as in Vancouver Island were found there. f 



As already indicated, the mountains on either side the 

 Strait of Georgia, and northwestward to the head of Lynn 

 Canal, about latitude 59° 20', are snow-clad throughout the 

 whole season. The shores are everywhere rocky and pre- 

 cipitous, retaining in many places far up their sides glacial 

 striae parallel with the direction of the numerous channels 

 which thread their way through the Alexander Archipelago. 

 I had opportunity at Loring, on the western shore of Revilla 

 Gigedo Island, to examine minutely the striatioh on the shores 

 and islands of Naha Bay. There are now no glaciers coming 

 down from the mountains of this island, but the shores and 

 islands abound in well-preserved glacial striae running west 

 by 18° north, corresponding to the direction of the local val- 

 ley, down which a glacier came in former times, entering 

 Behm's Canal nearly at right angles to its course upon that 

 side of the island. This is about latitude 55° 40'. 



Upon proceeding one degree to the north, I had oppor- 

 tunity also to observe closely the striae at Fort Wrangel. 

 Here, too, they show the influence of the continental eleva- 

 tion to the east, and are moving outward in a westerly direc- 

 tion toward the Duke of Clarence Strait. 



In Glacier Bay the evidence of the recent vast extension 

 of the glaciers down the bay, and of the facility with which 



* " On the Superficial Geology of British Columbia," in the " Quarterly Jour- 

 nal of the Geological Society," vol. xxxiv, February, 1878, pp. 99, 100. 

 f " American Journal of Science," vol. c, p. 323. 



