I; 



314 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Feet Meters 



4. Interbedded layers of gray fossiliferous limestone and 



greenish-gray siliceous shale 20 6.1 



Fauna. — (35h) : 



Nisusia festinata (Billings) 

 Scenella sp. 

 Hyolithellus sp. 

 " Ptychoparia " pia Walcott 

 Agranlos ? thia Walcott 

 Bonnia Heldensis Walcott 

 Olcnellus canadensis Walcott 

 Mesonacis gilberti Meek 



Total thickness of Mount Whyte 390 118.9 



St. Piran Formation 

 The formation next subjacent to the Mount Whyte is finely 

 exposed on the eastern slope of Mount Bosworth, also 

 at Mount Temple and west to Lake O'Hara. 

 la. Greenish siliceous and arenaceous shales in layers i to 

 3 inches (2.5 to 7.6 cm.) in thickness, interbedded in 

 shaly and thin-bedded, gray and brownish-gray sand- 

 stone, with a thick layer of compact, gray sandstone, 



near the top 68 20.7 



lb. Irregularly-bedded, brownish, dirty gray, and occa- 

 sionally purplish-colored sandstones, more or less 

 compact and quartzitic and in massive and thin layers 



that break down readily on slopes 310 94.5 



Fauna. — 



Annelid trails and borings (Scolithus) 

 Hyolithes sp. 



Olenellus canadensis ? Walcott 

 "Ptychoparia" (2 species) 

 If. Massive-bedded, compact, light gray and pinkish quart- 

 zitic sandstones 125 38.1 



Fauna. — 



Annelid trails and borings (Scolithus) 

 Hyolithes sp. 



Olenellus canadensis ? Walcott 

 (fragments) 



Total St. Piran exposed on Mount Bosworth.... 503 153-3 

 In the Lake Agnes and Louise section about 5 miles 

 (8.0 km.) southeast of Mount Bosworth, the total 

 thickness of the St. Piran formation is 2,705 feet 

 (824.5 m.), which is assumed as its maximum thick- 

 ness 2,705 824.5 



Fort Mountain Formation 



I. Alternating bands of thick and thin layers of gray, 

 brownish-weathering, compact quartzitic sandstones. 

 Estimated thickness 600 -j- 182.8 -\- 



