NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 363 



Tah Formation p^^^ Meters 

 Hard, green and purple siliceous shales with irregularly 

 intercalated massive beds of gray and purple, com- 

 pact limestone interbedded in central portion 800 243.8 



Fauna. — No fossils found. 



McNaughton Formation 



Light gray, massive-bedded quartzitic sandstone 500 + 1524 + 



Fauna. — No fossils found. 



At Moose Pass there are only a few layers of this 

 formation exposed, but to the southwest toward Yel- 

 lowhead Pass, the sandstones have a thickness esti- 

 mated at SCO feet (152.4 m.). This, however, is very 

 uncertain, as it is difficult to determine the line of 

 demarcation between the sandstone of Cambrian and 

 pre-Cambrian (Beltian) age. 



Unconformity 



ALGONKIAN 



beltian series 

 MiETTE Formation 



Massive-bedded, gray sandstones, with thick bands of gray 



and greenish siliceous shales 2,000 -f- 609.6 + 



The best exposures seen of the Beltian series were 

 along both sides of Yellowhead Pass, from the vicinity 

 of Grant Brook on the west to Fitzhugh on the east. 



In the Yellov/head Pass, the cuts of the Grand 

 Trunk Pacific and the Canadian northern railroads af- 

 ford fine sections of the Miette sandstones and shales. 

 Some of the layers of sandstones are clean and fresh, 

 but most of the rock suggests deposition of the sand in 

 muddy water. 



It may be that more than one formation occurs in 

 the Beltian series, but without detailed study and 

 mapping it will be difficult to determine the limits to 

 be assigned to the strata provisionally grouped in the 

 Miette formation. 



On both the north and south sides of Yellowhead 

 Pass, the Miette formation occurs in rounded, wooded 

 ridges that rise over 2,500 feet (762 m.) above the 

 Pass. To the north, the Cambrian of McEvoy Moun- 

 tain rises as great castelated masses on the northwest 

 side of Miette River, and on the west side, Hota 

 Mountain forms an outlying butte of Cambrian sand- 

 stone and limestone. 



To the south of the Pass, the banded cliffs of Cam- 

 brian rocks in Mount Fitzwilliam and Mount Pelee 

 rise high above their base of Miette sandstones. 



