CAMBRIAN CORDILLERAN FORMATIONS — WALCOTT 5 



Derivation. — From IMt. St. Piran, the type locality. 

 Character. — Mainly gray, quartzitic sandstones, with a few 

 Ijands of siliceous shale. 



Thickness. — At Mt. St. Piran, 2,640 feet. 



Organic Remains. — Lower Cambrian in the upper portion. 



Lake Louise Formation 



Type Locality. — On both sides of Lake Louise, at its upper end ; 

 well shown on the northwest and north sides of Fairview Mountain. 

 Derivation. — From Lake Louise, the type locality. 

 Character. — Siliceous shales. 



Thickness. — At upper end of Lake Louise, 105 feet. 

 Organic Remains. — Lower Cambrian. 



Fairview Formation 



Type Locality. — Northeast slope of Fairview Mountain. 

 Derivation. — From Fairview Mountain, the type locality. 

 Character. — Gray, quartzitic sandstones. 



Thickness. — On east slope of Fairview Mountain, 1,000 -\- feet. 

 Organic Remains. — Unknown. No attempt was made to find 

 fossils in this formation. 



NORTHEASTERN UTAH AND SOUTHERN IDAHO 



The section in Blacksmith Fork Canyon was first measured by 

 Mr. F. B. Weeks, assisted by Mr. L. D. Burling, in a general recon- 

 naissance of the northeastern and central parts of Utah made in 

 1905. In 1906 I established a permanent camp in the canyon and, 

 assisted by Mr. L. D. Burling, spent nearly two months in detailed 

 work upon the section and its faunas. 



Near the close of the summer, camp was moved to Mill Canyon, 

 in the Bear River Range, about 5 miles west of Liberty, Bear Lake 

 County, Idaho, where Mr. R. S. Spence, of Evanston, Wyoming, had 

 discovered a remarkable deposit of lower Middle Cambrian fossils. 

 The section at this point was measured and found to agree quite 

 closely with that in Blacksmith Fork ; and the shale, which contained 

 the rich fauna discovered by Mr. Spence, was called the Spence Shale 

 horizon of the Ute formation from Spence Gulch, in which it has its 

 great local development. 



