252 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



the arenaceous shales near Cranbrook, and it is finely developed at 

 Mount Schafifer and other localities along the main range of the 

 Rocky Mountains. 



Fauna. — The known fauna includes 28 genera and 60 species, and 

 a restudy of the material now in progress will undoubtedly add a 

 large number of species and probably genera. The fauna includes 

 representatives of both Lower and Middle Cambrian genera.* In 

 fact at the present time, until more diastrophic evidence has been 

 obtained, the exact boundary between the Middle and Lower Cam- 

 brian cannot be drawn with any degree of certainty. 



Observations. — The formation name Mount Whyte was proposed 

 in 1908^ for a series of alternating bands of limestone and siliceous 

 and calcareous shale some 386 feet (117.7 m.) in thickness as found 

 on the north slope of Mount Whyte above Lake Agnes and about 

 2 miles (3.2 km.) west of the outlet of Lake Louise, Alberta. Later ' 

 a detailed section was published, accompanied by preliminary lists of 

 the genera and species of fossils that had been found at several hori- 

 zons, and a list of species found in drift blocks on the south slope 

 of Mount Bosworth that were supposed to have been derived from 

 the Mount Whyte formation, but which later work has proved to 

 have come from a higher horizon. 



St. Piran Formation. Walcott, 1908 ' 



Type locality. — Slopes of Mount St. Piran a little northwest of 

 Lake Louise. 



Derivation of name. — From Mount St. Piran. 



Character. — This is essentially a sandstone formation, with some 

 greenish, siliceous and arenaceous shales in its upper portion. The 

 sandstones are more or less quartzitic in the middle and lower parts 

 of the section, and vary in color from light gray to dirty gray, 

 brownish, purplish, and pink. 



Thickness. — At Mount St. Piran, 2,705 feet (824.5 ^'^■)- Li the 

 Mount Bosworth section, about 5 miles (8 km.) northwest of Mount 

 St. Piran, 503 feet (153.3 "''•) ^^ exposed, followed below by the 

 Lake Louise shale, 105 feet (32 m.), and the Fort Mountain quartzitic 

 sandstone, 600+ feet (182.9+ ""■•) i^i thickness, Jill of which may be 

 included but have not been recognized in the Mount St. Piran section. 

 At Castle Mountain, 24 miles (38.7 km.) southeast of Mount St. 



^ Smithsonian Misc. Coll., Vol. 67, No. 3, 1917, pp. 62-67. 

 ^ Idem, Vol. 53, No. i, 1908, p. 4. 



* Idem., No. 5, pp. 212-215. 



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



