276 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Stephen Formation 



Feet 



10. Gray, buff-weathering, compact limestone i 



lb. Drab and greenish argillaceous shale 57 



Fauna. — (sSu) : Obolus mcconnelli Walcott, Hyolithes, and 



trilobites. 

 ir. Calcareous and arenaceous, gray-weathering, buff and 



yellow shale 170 



Fauna. — Obolus mcconnelli Walcott 



id. Thin-bedded, bluish-black and bluish-gray, fossiliferous 



limestone, with a few interbedded oolitic layers 6 to 12 



inches (15 to 30 cm.) thick 138 



Fauna. — A Glossopleura fauna. 



Total Stephen fofmation 366 



Cathedral Formation 



\a. Massive-bedded, gray arenaceous limestone with dark 

 irregular annelid borings in many of the layers. At 

 165 feet (50.3 m.) from the base, a band of bluish- 

 gray limestone occurs in thin layers for a thickness of 

 10 to 12 feet (3 to 3-7 m-) 435 



16. Thin-bedded, bluish-gray limestone, most of which is 



similar to the limestone of la 270 



Total Cathedral formation 705 



Ptarmigan Formation 



i(T. Bluish-black fossiliferous limestone 12 



Fauna. — This fauna is peculiar for the small size of its 



fossils. It contain^, among other trilobites, Albertella 



and Dorypygc. 

 lb. Gray arenaceous limestone that in nearly every bed is 



marked by large, irregular, dark annelid borings. 



About 75 feet (22.9 m.) from the base the limestone 



passes into gray quartzitic sandstone 260 



Total Ptarmigan formation 272 



LOWER CAMBRIAN 



Mount Whyte Formation ^ 



la. Bluish-black, thin-bedded limestone 40 



Fauna. — (sSd) : some undescribed trilobites. 



lb. Bluish-gray, thin-bedded limestone, with oolitic layers 



I to 8 inches (2.5 to 20.3 cm.) thick. 96 



Fauna. — Many indeterminate fragments of trilobites. 



ic. Gray and dirty brown, thin-bedded sandstone 22 



Fauna. — A typical upper Mount Whyte fauna. This fauna 



appears to be similar to that of the same horizon on 



Mount Bosworth and Mount Stephen. 



Meters 



•3 



17.4 



51.8 



42.1 



III.6 



132.6 



82.3 

 214.9 



37 



79.2 

 82.9 



12.2 



293 

 (>.7 



