NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 249 



Murchison of the Saskatchewan River area and the Stephen of the 

 Bow River Valley-Kicking Horse River sections, and as surveys are 

 extended along the main range to the north and south of Robson 

 Peak District, the formation will presumably be found to have a wide 

 distribution. 



Fauna. — Middle Cambrian, resembling the Stephen fauna. 



Observations. — In the future the Titkana as a formation may be 

 found to change its lithological character and volume from place to 

 place, and it will then receive distinctive names. 



Cathedral Formation. Walcott, 1908' 



Type locality. — South face of Mount Bosworth between Hector and 

 Stephen on the Canadian Pacific Railway, also finely exposed in 

 Cathedral Crags east of Mount Stephen. 



Derivation of name. — From Cathedral Crags. 



Character. — More or less arenaceous, thick and thin layers of hard, 

 gray limestone forming fine clififs where not broken down. " 



Thickness. — At Mount Bosworth, 1,212 feet (369.4 m.), at Castle 

 Mountain in the Bow Valley, 705 feet (214.9 m.), and in the Siffleur 

 River section 34 miles (54.7 km.) north, 1.240 feet (377.9 m.). It 

 may be that the Ptarmigan formation is included in the lower portion 

 of the Sifileur section, but in the clifi^ exposures there was no evidence 

 of this obtainable. 



Geographic distribution. — Mount Bosworth, Cathedral Crags, 

 Mount Stephen in Kicking Horse Canyon area. Clififs of Mount 

 Sedgwick on south side of Siffleur River. 



Stratigraphic relations. — Upper limit defined by the thin-bedded, 

 dark, bluish-gray limestones of the Stephen formation in the Kicking 

 Horse Canyon area and by similar limestones in the Siffleur River 

 section. The lower boundary is clearly marked in the northern clififs 

 of Popes Peak at Ross Lake on the south side of Kicking Horse 

 Pass opposite Mount Bosworth.' The Cathedral terminates below in 

 a massive-bedded, rough, arenaceous limestone that rests conformably 

 on a thin-bedded, arenaceous, mottled limestone of the Ptarmigan 

 formation. This same relation also occurs in the eastern clififs of 

 Mount Bosworth overlooking the Bow River Valley. 



Fauna. — Annelid trails and borings only. 



^ Smithsonian Misc. Coll., Vol. 53, No. i, p. 4. 

 ■ Idem, Vol. 67, No. 2, 1917, pp. 13, 14, pi. 2. 



