44 



THE ICE AGE IK NORTH AMERICA. 



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SKETCH MAP OF 

 GLACIER BAY ATJD MUIR GLACIER 



By HARRY FIELDING REID. 



SCALE OF MILES 



l:iG 30 



Fig. 22. 



the trees are of moderate size ; but the islands and shores in 

 the upper part of the bay are entirely devoid, of forests. 

 Willoughby Island, near the middle of the bay, is a bare 

 rock, about two miles long and fifteen hundred feet high, 

 showing glacial furrows and polishing from the bottom to 

 the top. Several other smaller islands of similar character 

 in this part of the bay show like signs of having been re- 

 cently covered with glacial ice. 



The upper end of the bay is divided into two inlets of 



