NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 25 1 



This fauna is known from its characteristic trilobite as the Alhcrtclla 

 fauna. 



Chetang Formation. Walcott, 1913* 



Type locality. — CHffs west of and above Coleman glacier, Robson 

 Peak District. 



Derivation. — From Chetang Cliffs. 



Character. — Bluish-gray, evenly-bedded limestones in thin layers, 

 with very little shale in the partings between the layers. 



Thickness. — Above Coleman glacier and Brook, 900 feet 

 (274.3 m.). 



Geographic distribution. — Chetang cliffs and probably to the north- 

 west and southeast. 



Fauna. — Middle Cambrian Alhertella fauna, which occurs in the 

 Ptarmigan formation north and south of Kicking Horse Pass. 



Observations. — The sedimentation of the Chetang formation is 

 not unlike portions of the Titkana, from which it is separated by the 

 hard Tatei limestones 800 feet (243.8 m.) in thickness. 



LOWER CAMBRIAN 

 Mount Whyte Formation. Walcott, 1908* 



Type locality. — North slope of Mount Whyte and southwest of 

 Lake Louise. 



Derivation of name. — From Mount Whyte. 



Character. — Alternating bands of gray and bluish-black limestone. 

 Siliceous and calcareous shales, with some interbedded sandstones 

 near the lower part. 



TJiickness. — At Mount Whyte, 386 feet (117.6 m.), south slope of 

 Mount Bosworth, 390 feet (118.9 m.) ; north side Mount Stephen 

 above railroad tunnel, 315 feet (96 m.) ; at Bow lake, 21 miles 

 (33.8 km.) north-northwest of Mount Whyte, 762 feet (232.3 m.) ; 

 at Ptarmigan Peak, 9 miles (14.5 km.) northeast of Mount Whyte, 

 252 feet (76.8 m.) ; southeast slope of Castle Mountain, 248 feet 

 (75.6 m.) ; in cliffs at south side of Siffleur River, 446 feet (136 m.). 



Geographic distribution. — The formation is widely distributed both 

 to the north and south of the Bow River Valley. It appears to be 

 represented by the Hota formation in the Robson Peak District and 

 it occurs in the Saskatchewan River Valley area on Mount Sedgwick 

 south of the Siffleur River. To the south it may be represented by 



^ Smithsonian Misc. Coll., Vol. 57, No. 12, p. 335. 

 ^ Idem, Vol. 53, No. i, 1908, p. 4. 



