NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 21/ 



WONAH QUARTZITE. WaLCOTT, I924' 



Type locality. — Southwest slope of Wonah Ridge on Sinclair 

 Mountain above Sinclair Canyon at the northern end of Stanford 

 Range, eastern British Columbia. 



Derivation. — Named from Wonah Ridge. 



Character. — Thick-bedded, white to grayish-white quartzite, the 

 lower layers of which are occasionally slightly cross-bedded. 



Geographic distribution. — This quartzite has been traced from 

 Sabine Mountain at the south end of the Stanford Range, north 

 to Sinclair Canyon and into the Brisco Range. The quartzite described 

 by Allan ' at the north end of the Beaverf oot Range as occurring 

 at the base of the Silurian limestones (Beaverf oot) and above the 

 graptolite shales (Glenogle) is undoubtedly the same formation. 



Thickness. — Variable. It ranges from 42 feet (12.8 m.) to over 

 100 feet (30.4 m.) in a distance of 2 miles (3.2 km.) in Sinclair Can- 

 yon. Near the head of Windermere Canyon, Walker reports 167 feet 

 (50.9 m.), and that " east of Tegart Mountain it is a coarse-bedded 

 sandstone 40 feet (12.1 m.) thick." Its representative in the Beaver- 

 foot Range, 15 miles (24.1 km.) southeast of Kicking Horse Canyon, 

 has a measured thickness of 800 feet (243.8 m.). 



ORDOVICIAN 



Skoki Formation. New Formation 



Type locality. — Light gray limestones, forming broken clififs be- 

 neath the Middle Devonian Messines limestone cliff on the eastern 

 side of Skoki Mountain and on the northeast shoulder of Fossil 

 Mountain (F on map) which is directly south across the canyon 

 between Skoki and Fossil Mountains. Skoki Mountain is 9 miles 

 (14.5 km.) northeast of Lake Louise Station, Alberta. (See pis. 



47-49-) 



Derivation. — From Skoki Mountain (8,750 feet, 2,667 '^•)- 

 Character. — Light gray, siliceous and magnesian limestones in 

 layers 15 to 24 inches (38.1 to 60.9 cm.) thick. In the lower half 

 of the formation the limestones are finer and contain thin inter- 

 bedded layers and nodules of bluish-gray chert that weathers to a 

 buff and reddish-brown color. 



Thickness. — On the northeast shoulder of Fossil Mountain, 500 

 feet (152.4 m.). 



' Smithsonian Misc. Coll., Vol. 75, No. i, 1924, p. 49. 

 " Geol. Surv. Canada, Mem. No. 55, 1914, pp. loi, 102. 



