﻿SHERZER 



GLACIAL STUDIES IN CANADIAN ROCKIES 



471 



through the snow, which areas bear a certain relation to the breadth, 

 height, shape and possibly position of the boulders themselves. Hie 

 phenomenon was of very frequent occurrence upon the Victoria and 

 Lefroy, and a suggestion of it was seen upon the surfaces oi the 

 avalanche slides about the mar- ins. bul all boulders did nol show it. 

 Figure 76 is of a white dolomite beginning to form a table, 5 it. 



p IG -6. — Melted area on the north side of a surface block, Victoria glacier. 



long and standing 20 in. high, with a melted area 5 ft. broad at the 

 base, 70 in. long and with its longer axis N. 8° W. Another block 

 is shown in fig. yj, a gray quartzite standing 10 in. high, with the 

 melted area conforming in size and shape to that of the rock. The 

 farther, right hand corner of the rock is lower than the general 

 surface and the corresponding corner of the area is seen to be 

 rounded and incompletely melted. The melted area, in all cases, is 

 much greater upon the northern than upon the southern side of the 

 rock. Ten of the axes of these areas, selected at random, gave an 

 average of X. 25. 5 \V.. magnetic, with rather less range than was 

 observed in the axes of the glacial tables. The magnetic variation 

 in this region, as obtained by the Canadian Topographic Survey, is 

 X. 2=;° 5' E., so that these areas are oriented with reference to the 

 position of the noonday sun. and might have been used for determin- 



