300 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



opportunity to examine each bed in detail. Well-marked Scolithus 

 occur in the sandstone just below the shale. 



At the lower end of the upper pond on the north side of the Pass 

 a fine outcrop of Lake Louise shale occurs, and above that the. sand- 

 stones of the St. Piran formation. At the upper (south) end of the 

 upper pond, numerous Lower Cambrian fossils occur in a light gray, 

 thin-bedded sandstone (6ob) of the St. Piran formation: 



Obolclla vcrmil'wncnsis Walcott 

 Orthothcca adainsi Walcott 

 Wanneria gracilis Walcott 



This same fauna occurs in the lower St. Piran formation at the 

 base of Wiwaxy Peaks (6ie) on Lake O'Hara, 7 miles (11.2 km.) 

 south of Hector on the Canadian Pacific Railway, British Columbia. 



00 QjX 



o B,DW'\/a\\ey 



51- 



5000' foot contour 



Pre-Cambnan up to X 



Fig. 30. — Diagrammatic outline sketch of a section from Mount Lefroy 

 on the southwest side of the Bow River Valley, northeast across the valley, 

 about a mile (1.6 km.) southeast of Lake Louise Station, R on map, plate 26, 

 and up over the high, rounded hills of pre-Cambrian (Hector and Corral 

 Creek) rocks and the Middle Cambrian limestones of Redoubt Mountain. The 

 position of the broadly rounded Bow Valley anticline is hypothetically indi- 

 cated by the dotted arched lines. There are several local faults and displace- 

 ments of strata in the pre-Cambrian of the valley floor that have not been 

 studied or mapped but the broad, general structure appears to be as represented. 



A direct line between Mount Lefroy and Redoubt Mountain would pass up 

 the canyon of Corral Creek, so the line of the section is carried over the 

 high Corral Hills on the south side of the creek. 



It may be that the strata on the northeast side of the valley, now forming 

 the Corral Hills north and south of Corral Creek, were raised in relation to 

 the mountains of the Bow Range on the southwest side of the valley by a 

 major fault that continues down the valley past Castle Mountain. At ,Castle 

 Mountain, however, the contact between the base of the Cambrian and the 

 pre-Cambrian is lower than on the southwestern side below Vermilion Pass 

 between Boom and Storm Mountains, which is the opposite of its relative 

 elevation on the line of the Lefrov-Redoubt Mountain section. 



The St. Piran sandstones form cliffs back from the Pass on the 

 west side in Boom Mountain and the high ridges north of Storm 

 Mountain on the southeast side. There is a fine section up to the base 



