DETAILED STRATIGRAPHIC DISTRIBUTION. 



129 



Detailed stratigraphic distribution of Cambrian and Ordovician Brachiopoda — Continued. 

 Biitish Columbia: Mount Bosworth— Continued. 



Mount Bosworth section. 

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



Other locaUties and species in 

 British Columbia and Alberta 

 shown in tlieir approximate 

 stratigraphic position. 



MIDDLE CAMBRIAN— continued. 



Cathedral limestone — Continued. 



Ic. Similar to la. Annelid borings and trails occm- in and on some of Feet. 

 the layers 12(1 



Id. Similar to 1& S3 



Ic. Thin-bedded lead-gray to blue-gray thin-bedded (layers 1 inch to 



4 inches thick) arenaceous limestone 25 



1/. Alternating thin and massive bedded arenaceous steel-gray lime- 

 stone weathering light gray 275 



1,595 



Total Middle Cambrian 4, 963 



LOWER CAMBRIAN. 



i placed 



at this horizon on account of the presence in the Mount 

 Stephen section of Olenellus in the limestone 110 feet below 

 the massive arenaceous limestone belt represented by 1/in 

 the Cathedral limestone of the Mount Bosworth section. 



la. Thin-bedded bluish-gray slightly s 



limestone 120 



Numerous annelid trails and 

 borings. 



1&. Gray oolitic limestone in layers 3 to 6 inches thict 44 



Acrotreta sagittalis taconica — 



57s. 

 Nisusia (Jamesella) lowi — 



57s. 

 Micrndiscus sp. undt. — 57s. 

 Agraulos sp. — 57s. 

 Ptychopana sp.— 57s. 



57m, 68l£, 58p, 58t. 



In the Mount Stephen section the 



following species occur at a 



horizon near the top of this 



limestone (58k and 58p): 



Acrotreta sagittalis taconica — 



58k:. 

 Nisusia alberta var.— 58k,58p, 

 Nisusia (Jamesella) lowi— 



5Sk, 5Sp. 

 Stenotheca elongata var. — 



58k. 

 Scenella variaTis—5Sk. 

 Platyceras n. sp.— oSk. 

 Hyolithes billing si— -b^V, 5Sp. 

 P/yfftopariasp.— 5Sk. 5Sp 

 Crepiccphalus n. sp.— 58k. 

 Protypusn. sp.— 58k. 

 Alhcrtella sp. undt.— 5Sk. 

 At Castle Mountain OftoZusporifMS 

 occurs at about this horizon 

 (58t). 

 About 50 feet down in the Mount 

 Stephen section, in a gray sili- 

 ceous shale, the following spe- 

 cies occur (57m) : 

 Cystid plates— 57m. 

 Micromitra (Paterina) sp. 



undt.— 57m. 

 Acrotreta sagittalis taconica — 



57to. 

 Nisusia (Jamesella) lowi — 



57m. 

 Ilyolithps (fragment)— 57m. 

 Hyolithellus cf. wicans— 57m.. 

 SceneUa varians—57n\. 

 Olenellus canadensis — 57m. 



Ic. Massive layers made up of banded bluish-gray limestone and 

 sandstone in layers i inch to 2 inches thick 



Agraulos sp. undt. 



67e, 67r, 58s. 



On Mount Stephen, at a horizon 

 near the top of this bed of lime- 

 stone, there was found (67e): 

 AcTothele coUeni—o7e. 

 Acrotreta sagittalis taconica— 



57e. 

 SceneUa varians^57e. 

 Stenotheca elongata var. — o7e. 

 Albertella sp. undt.— 57e. 

 Olenellus canadensis— 57 e. 

 BathyuTiscus sp. undt.— 57e. 

 Near the base on Mount Stephen 

 (57r»68s): 



Micromitra (Paterina) labra- 



doTica var. — 57r. 58s. 

 Micromitra (Iphidella) pan- 



nula—57v, 58s. 

 Acrotreta sagittalis taconica — 



57r, 5Ss. 

 Ptychoparia, 3 species— 57r, 



62667°— VOL 51, pt 1—12- 



