174 



the same composition. The nature of this rock suggests 

 shallow-water or near-shore conditions of origin. 



Hector Formation. The beds in this formation consist 

 of gray, purplish, and greenish shale interbedded with 

 bands of conglomerate 15 m. to 75 m. thick. The best 

 exposure is in the Bow range east of Storm mountain, 

 where the formation has a minimum thickness of 4,590 

 feet (1,399 m -)- It thins out towards the northwest; in 

 Mt. Temple, Walcott measured over 2,150 feet (655 m.), 

 and at Fort mountain towards the head of Corral creek 

 he obtained a section 1,302 feet (397 m.) thick. 



From one layer of shale (50 cm. thick), outcropping on 

 the eastern base of Storm mountain and about 16 metres 

 from the top of the series the writer collected fossil remains 

 of a brachiopod-like shell about one-eighth of an inch in 

 diameter. This is the only locality in which fossil remains 

 have yet been found. 



CAMBRIAN. 



The Cambrian series is complete in this section with 

 both lower and upper contacts exposed. There is a total 

 thickness of over 18,578 feet (5,663 m.). This represents 

 one of the thickest Cambrian sections yet measured in 

 the world. It essentially consists of 3,800 feet (1,159 m.) 

 of siliceous beds, principally quartzitic sandstone; 10,275 

 feet (3,132 m.) of calcareous and dolomitic limestone, and 

 4,500 feet (1,371 m.) of shale, much of which is calcareous. 

 The various divisions of the Cambrian series have been 

 made on paleontological and lithological evidence. The 

 formations in the Lower and Middle Cambrian and the 

 first three in the Upper Cambrian were named and meas- 

 ured by Walcott, [7, p. 204]; the remaining two formations 

 were named and measured by the writer. 



LOWER CAMBRIAN. 



Fairview Formation. — The Fairview formation con- 

 sists of brown and white quartzitic sandstone. Locally 

 there is a basal conglomerate on the Pre-Cambrian 

 shales; it consists of rounded pebbles of white quartz, up to 

 7 cm. in diameter, in a cement of quartz, feldspar and mica. 

 The basal rock is more frequently a coarse sandstone 

 with rounded and angular grains of quartz and feldspar, 



