NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 253 



Piran, the formation has a thickness of 55+ feet (16.8+ m.), with 

 the base concealed by debris. In the cHffs on the south side of the 

 Siffleur River, it is 770 feet (234.7 m.) thick, with base concealed 

 beneath the talus. 



Geographic distrihiifiou. — Upper Kicking Horse Canyon at Mount 

 Stephen. North and south sides of Bow River Valley from Mount 

 Bosworth on Continental Divide to Castle Mountain. In the upper 

 Saskatchewan Valley in the cliffs on the south side of Siffleur River 

 It may be represented by the Mahto sandstones in the Robson Peak 

 District. To the south it presumably occurs in the Mount Assini- 

 boine massif above Gog Lake, and in the north ridge of Wedgewood 

 Peak. 



Fauna. — Annelid trails and borings, HyoUthcs sp., fragments' of 

 OJcncUiis cf . 0. caiiadoisis Walcott. and small trilobites. 



HoTA Formation. Walcott, 1913' 



Type locality. — Southwest spur of Mahto Mountain, Robson Peak 

 District. 



Derivation. — From Hota cliffs on the north side of Coleman Brook 

 and the southwest side of Mahto Mountain. 



C/u7;'flr/rr.— ]\Iassive-bedded, arenaceous limestones in great bands 

 of light and dark gray color and a pinkish-weathering band in the 

 upper portion. 



Thickness — On Mahto Mountain, 800 feet (243.8 m.). 



Geographic distribution. — Southwest side of Mahto Mountain and 

 probably to the southeast to Moose River and to the northwest in 

 the high ridge southeast of Smoky River below Calumet Creek. 



Fauua.—hower Cambrian.^ 



Observations. — The Hota occupies the stratigraphic position of 

 the Mount Whyte formation of the Bow River Valley and Saskatche- 

 wan sections but it differs in its more uniform series of thick-bedded, 

 arenaceous limestones. The same sort of Mesonacidae occurs in each, 

 which makes it probable that the two formations were being deposited 

 about the same time but from different sources of sediment. 



Lake Louise Shale. Walcott, 1908^ 

 Type locality. — In cliffs on the Beehive and Fairview Mountain 

 above upper end of Lake Louise. 



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



''Idem, No. 11, 1913, p. 309. By error all the fossils from the Robson Peak 

 region described in this paper were referred to the Mahto formation which 

 however is unfossiliferous. 



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



