180 



CAMBEIAN BRACHIOPODA. 



Detailed stratigraphic distribution of Cambrian and Ordovician Brachiopoda — Continued. 

 British Columbia: Mount Bosworth— Continued. 



Mount Bosworth section. 

 [Walcott, 1908f, pp. 204-217.] 



Other localities and species in 

 British Columbia and Alberta 

 shown in their approximate 

 stratipraphic position. 



LOWEE CAMBRIAN— continued. 



Mount Whyte formation— Conimned. 

 2. Gray and brownish-gray sandstone in thin and massive layers. 



On Mount Stephen, at this hori- 

 zon, there were found: 

 Microdiscus sp. undt. 

 Olenellus sp. undt. (frag- 

 ments). 

 Plychoparia sp. undt. 

 Prntypus sp. undt. 



3. Siliceous shale with a few interbedded thin layers of compact hard 



gray sandstone - 115 



3Sc. 



On the south slope of Mount 

 Bosworth two drift blocks 

 of siliceous shale, supposed 

 to be from this horizon, 

 were found, from which 

 the following species were 

 collected: 



Micromitra {Patenna) 

 wapta — 35c. 



Obolus parvus — 35c. 



Acrothele colleni — 35c. 



Wimanella simplex— S5c. 



Agraulos sp. — 35c. 



Ptychoparia sp.— 35c. 



Albertella hosworthi—Sdc. 



A Ibertella helena — 35c . 

 sp.— 35c. 



35e. 



In the Lake Agnes section, 5 miles 

 southeast of Mount Bosworth, 

 the fauna of about this horizon 

 includes : 



Mi cTomitra {Patenna) 

 waptaSSe. 



Obolus parvus— Z5e. 



HyolUlies billingsi — 35e. 



Olenopsis n. sp. — 35e. 



Ptychoparia, 3 species. — 35e. 



Albertella sp. undt. — 35e. 



Batliyuriscus — 35e. 



Olenellus gilberti — 35e. 

 On Mount Stephen, at about the 

 same horizon, the following 

 were found: 



UyoUthcs billingsi. 



Scenella varians. 



Olenopsis n. sp. 



"^FvT 



Total of Mount Whyte formation. 



35h. 



Nisusiafestinata — 35h. 

 Scenella varians — 35h. 

 Hyolithellus — 35h. 

 PtycTioparia-^bh.. 

 Agraulos — 35h. 

 Protypus n. sp.— 35h. 

 Olenellus canadensis — 35h. 

 Olenellus gilberti — 35h. 



35f. 



At this horizon on Mount 

 Stephen the following were 

 found: 



Micromitra {Iphidella) pan- 

 nula — 35f . 



Kutorgina cingulata — 35f. 



Eutorgina sp. undt.— 35f. 



Acrotreta sagittalis taconica — 

 35f. 



Nisusia festinata—SSf. 



Hyolifhcs billingsiS5f. 



Scenella varians — 35f. 



Protypus n. sp.— 35f. 



Agraulos sp. undt. — 35f. 



Ptychoparia, 3 sp. undt.— 35f. 



Olenellus canadensis — 35f. 



'■■'r.Vi':.' ,/ Bow Kiver group. 



St. Piran sandstone [Walcott, 190Sa, p. 4]: 



lo. Siliceous and arenaceous greenish-colored shales in layers 1 to 



3 inches in thickness interbedded in shaly and thin-bedded 



gray and brownish-gray sandstone, with a thick layer of 



compact gray sandstone near the top 



lb. Irregularly bedded bro\raish, dirty-gray, and occasionally 

 purplish-colored sandstones, more or less compact and 

 quartzitic, in massive and thin layers that break down read- 

 ily on slopes 310 



In the Lakes Louise and Agnes section, about 5 miles southeast of 

 Mount Bosworth, the total thickness of the St. Piran sand- 

 stone is 



Below the St. Piran the following section occurs: 

 Lake Louise shale [Walcott, 1908a, p. 5]: 

 1. Compact gray siliceous shale 



Annelid trails and borings 



(Scolithu^). 

 Hyolithes. 



Olenellus canadensis?. 

 Ptychoparia, 2 species. 



Annelid trails and borings 



{Scolithus). 

 Hyolithes. 

 Olenellus canadensis?. 



35d. 



Annelid trails— 35d. 

 Cruziana — 35d. 

 Mi cromitra (Iphidella) 

 louise — 35d. 



60b. 



Obolella vermilionensis—QOXi. 

 Wanneria gracile—QOh. 



