NOR wl SMITHSONIAN EXPEDITIONS, IQIO-IQII 39 
seal-island patrol. Therefore other arrangements were made for 
transportation during the remainder of the season. Mr. Wetmore 
went to Unalaska to work in that vicinity for a while and to secure 
passage homeward along the south side of the Alaska Peninsula. The 
results of his work, however, belong to the Biological Survey The 
remainder of the party secured passage to Nome on the gasolene 
schooner Polar Bear, owned and commanded by Mr. Louis L. Lane, 
of Seattle. They sailed from Unalaska on July 3, and reached Nome 
July 11, having spent one day on Bogoslof Volcano, half a day on St. 
Paul Island, half a day at Walrus and a day at St. Matthew and Hall 
islands. 
No thorough work could be done on such a hurried trip, but a fairly 
good impression was obtained of the avifauna of these interesting 
islands and a large series of photographs taken. 
Although the Murre colonies at Bogoslof Island were the most 
extensive seen and probably included the greatest number of birds, 
they were totally eclipsed in density by the wonderful colonies on 
Walrus Island. This is a most remarkable little island, an ornitho- 
logical wonderland, where ten species of seabirds breed in countless 
multitudes. The California Murres rank first in number, literally 
covering the low cliffs and rocky shores all around the island, as 
well as large spaces on top of it, with dense masses of birds sitting 
close together. 
STUDIES IN CAMBRIAN GEOLOGY AND PALEONTOLOGY IN THE 
CANADIAN ROCKIES 
During the field season in 1909, Dr. Charles D. Walcott, Secretary 
of the Smithsonian Institution, continued his investigations in the 
geology of the Cambrian and pre-Cambrian rocks of the Bow River 
Valley, Alberta, Canada, and on the west side of the Continental 
Divide north of the Canadian Pacific Railway in British Columbia. 
The first camp was made on the shores of Lake Louise, southwest 
of Laggan. From this point work was carried forward on the high 
mountains east, northeast, and southwest of the lake, and side trips 
were made to the Valley of the Ten Peaks and across the Bow Valley 
in the vicinity of Ptarmigan Lake. Many fine photographs were 
secured, both of the beautiful scenery and of the geological sections 
which are wonderfully well shown above timber line on the higher 
ridges and peaks. 
The measurements of the Cambrian section were carried down to 
a massive conglomerate which forms the base of the Cambrian 
