252 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1915. 



with lyatnnga (black rock) Mountain forms the miglitj^ portals of 

 the great glacier. 



Day after day we passed between these portals and climbed over 

 the crevassed and hnmmoclcy ice in order to trace the connection of 

 the rocky section of Titkana Peak with that of Robson (pi. 16). 

 Thanks to the fine fossil fauna found in Billings Butte and the 

 slope of the layers of rock a satisfactory " tie " was made across the 

 glacier to the limestones of Robson. 



The work was trying and tedious, but nature kindly assisted by 

 bringing down long trains of bowlders on the ice of the glacier. 

 From these was revealed the story concealed in the cliffs far above, 

 and thus we learned the history of the rocks connected with those of 

 the more accessible cliffs on the opposite side of the glacier. 



The geologic story of this enchanting region is too long and com- 

 plicated to be related here. Suffice it that I found over 12,000 feet in 

 thiclmess of Cambrian beds capped by 3,000 feet or more of Ordo- 

 vician strata high up on Robson Peak. 



A new fossil find was made by chance. Mr. Harry Blagden and 

 I were sitting on a huge block of rock at the lower end of Mural 

 Glacier, munching our cold luncheon, when I happened to notice a 

 block of black, slialy rock lying on the ice. Wishing to warm up, 

 for the mist drifting over the ice was cold and wet, I crossed to the 

 block and split it open. On the parting there were several entire 

 trilobites belonging to new species of a new subfauna of the Lower 

 Cambrian fauna (pi. 17). 



There were also some fine marine shells of a kind that occurs in 

 the Lower Cambrian rocks west of Petrograd, Russia. We found 

 the bed from which this block had come by carefully tracing frag- 

 ments of the shale scattered on the upward-sloping surface of the ice 

 to a cliff 2 miles (3.2 kilometers) up the glacier at the foot of 

 Mumm Peak, which is a high point (9,740 feet=2,968 meters) di- 

 rectly north of Robson Peak. The fossil locality is high up, where 

 rain, fog, and snow squalls may be expected nearly every day of the 

 year. Working until late in the afternoon, we carried all of the 

 rock we could pack over the glacier and down through the cliffs to 

 the valley of the Smolry River. 



One of our horses had taken leave on his own account, so we 

 loaded faithful Billy with the rock specimens, two rifles, two shot- 

 guns, a camera, and our raincoats and plodded over the muddy trails, 

 forded two icy-cold rivers, and " dropped " in at camp three hours 

 after dark. At the last ford the powerful animal carried us both and 

 all our impedimenta through the broad, rushing glacial stream. 



If any readers wish to visit Robson Peak they can readily do so 

 by going to Edmonton and thence by railroad to Mount Robson 

 Station, which is in sight of Robson Peak. The Alpine Club of 



