PRE-CAMBRIAN OF SOUTHEASTERN B.C. 
81 
PRE-CAMBRI AN-PAL^EOZOIC SECTION AT ELKO, 
BRITISH COLUMBIA. 
The mountains to the north of the Eik River valley at Elko, 
form the most westerly part of the Rocky Mountain system. 
The structure of these mountains is of the nature of a syncline 
striking northwest-southeast. The eastern limb of the syncline 
is cut off by a northwest-southeast fault which brings the Devono- 
Carboniferous limestone in contact with the Roosville formation. 
The strata forming the western limb of the syncline and inci- 
dentally the western face of the Rocky mountains, dip, on an 
average, 45 degrees to the northeast. 
Elko, a station on the Crowsnest branch of the Canadian 
Pacific railway, is situated on the western slope of the Rocky 
Mountain system, at the Elk River portal to the Kootenay 
valley or Rocky Mountain trench. The section exposed at 
Elko can be most easily expressed in a stratigraphical column. 
Devonian 
. Jefferson limestone 
feet. 
300 + 
Silurian, Ordovician, or 
Cambrian 
Lowest — Middle Cam- 
.Elko formation 
90 + 
brian 
.Burton formation 
80 + 
Unconformity. 
Beltian 
. Roosville formation . . 
1000 
Phillips formation 
500 
Gateway formation 
1000 + 
The Gateway, Phillips, and Roosville belong to the Galton 
series of Daly. 1 
Gateway Formation. The lower part of the formation consists 
of alternating bands of massive, concretionary, siliceous dolomite 
and limestone weathering buff, and massive, light grey quartz- 
ites. These are succeeded by thin-bedded, sandy argillites, and 
greenish grey, siliceous argillites. The sandy argillites weather 
^aly, R. A., Geol Surv. Can., Memoir 38, p. 97. 
