NO. 12 CAMBRIAN FORMATIONS ROBSON PEAK DISTRICT 335 



CHETANG LIMESTONES.— [Middle Cambrian] bluish-gray thin- 

 bedded limestones. 



Estimated thickness 900 



Fauna. — Characteristic fossils of the lower portion of the Middle 



Cambrian, found at two horizons. 

 Name derived from Chetang Cliffs above Coleman G'p.cier, north 

 of Titkana Peak. 



HOTA FORMATION. — [Lower Cambrian] gray arenaceous limestones 

 and siliceous shales alternating with massive quartzitic sand- 

 stone. 



Estimated thickness 800 



Fauna. — Olenellus and other genera characteristic of the upper 



part of the Lower Cambrian. 

 Name derived from Hota Cliffs rising above Coleman Brook which 

 runs along the southwest base of Mahto Mountain. 



MAHTO SANDSTONES.— [Lower Cambrian] massive-bedded quartz- 

 itic sandstone with bands of siliceous shale. 



Estimated thickness 1.800 



Fauna. — Fragments of Olenellus in the upper portion on Mahto 



Alountain. 

 Name derived from ]\lahto ,]\Iountain, which faces the valley on 

 the south side of Calumet Creek east of Smoky River. 



TAH FORMATION.— [Lower Cambrian] siliceous shale and inter- 

 bedded siliceous limestones. 



Estimated thickness 800 



Fauna. — No fossils found. 



Name derived from Tah Mountain, east-northeast of Mahto JMoun- 

 tain and southwest of Moose Pass. The formation occurs just 

 above the Pass at the base of the mountain. 



McNAUGHTON SANDSTONES.— [Lower Cambrian] quartzitic sand- 

 stones. 



Estimated thickness 500 



Fauna. — No fossils found. 



Name derived from McNaughton Mountain, situated opposite the 

 mouth of the Hihuna River where it enters Moose River. 



MIETTE SANDSTONES.— [Pre-Cambrian] Belt series, massive gray 



sandstones with interbedded siliceous shales. 



Estimated thickness 2,000-f- 



Fauna. — No fossils found. 



Name derived from Miette River, which cuts through the Miette 



formation for manv miles in the vicinity of Yellowhead Pass. 



