16 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 66 
but they have left behind them basins that are filled by beautiful 
lakes, such as Magog (fig. 5), Sunburst (fig. 4), and Ross (fig. 14). 
The line of demarcation between the Lower and Middle Cambrian 
was found to be high up in the section on the face of the cliffs at 
Wonder Pass, and throughout the Assiniboine massif. 
While camped on Magog Lake below Mount Assiniboine, some 
marvelous reflections of the peak in the waters of the lake were seen 
Fic. 21.—A noonday rest at Wonder Peak, after climbing up the side of 
Naiset Mountain. A shelter was made of saddle blankets to break the force 
of the cold wind. Photograph by Walcott, 1916. 
in the quiet of the early morning, and by a fortunate combination 
of a “clear-cut” day and calm at the lake level, the photographs 
reproduced in figures 6, 7, and 8 were secured. The changes in the 
“cloud banners,” at the peak, which occur very rapidly, are well 
shown by figures 7 and 8. These views led us to regard the grand 
pyramid of Mount Assiniboine as the Matterhorn of America. 
Northwest of Banff the broad valley of the Bow has been eroded 
diagonally back through the massive scarf of the overthrust massif 
