NO. 30 SMITHSONIAN EXPLORATIONS, IQ12 31 
The stratigraphic section was found to contain approximately 
12,000 feet of Cambrian rocks and 3,000 feet of Ordovician, the 
transition between the two systems of rocks occurring in Billings 
Butte (figs. 28, 29), which projects upward beside Hunga Glacier. 
At the northern base of Mumm Peak (figs. 25, 26), above Mural 
Glacier a new sub-fauna of the Lower Cambrian was discovered, the 
fossils being beautifully preserved. 
Fic. 33.—Harry H. Blagden and Sidney S. Walcott preparing 
ptarmigan skins for shipment to the Smithsonian Institution. 
Photograph by Walcott, 1912. 
Dr. Walcott was accompanied by Mr. Harry H. Blagden, of the 
Smithsonian Expedition of rg1r, and his son Sidney S. Walcott. 
The two young men secured a number of fine mammal skins, which 
have been added to the collections of the National Museum. The 
collections of the Museum were also enriched by a fine series of 
fossils from the Burgess Pass quarry, reference to which was made 
in the report on the expeditions of the Smithsonian Institution of 
1910 and 1911 (Smithsonian Miscellaneous Collections, Vol. 59, No. 
II, pages 39-43). 
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