32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



He collected a few fossils corresponding in age to those of the 

 Pipestone formation. A preliminary examination gave 



Heliophyllum sp. 

 Schizophoria macfarlani Meek 

 Martinia nieristoides Meek 

 A try pa reticularis Lin. 

 Spirifera cf. compactus Meek 

 Productella cf. lachrymosa (Con.) 



This fauna is referable either to the uppermost Middle Devonian 

 or to the Upper Devonian. (Kirk.) 



SILURIAN 



The Silurian limestones form the higher summits and ridges of the 

 range from Kicking Horse Canyon to Sabine Mountain. They are 

 grouped under the Brisco and Beaverfoot formations and described 

 in the Sinclair section (p. ii), where the Brisco is assigned a thickness 

 of 1,200 feet (365.8 m.) and the subjacent Beaverfoot 400 feet 

 (121. 9 m.). The fauna of the Brisco is about middle Silurian (see 

 p. 11) and that of the Beaverfoot low in the Silurian (Richmond) 

 (see p. 13). 



WoNAH Quartzite: 



This quartzite is subjacent to the Beaverfoot and superjacent to 

 the Sinclair formation which is of lower Ordovician (Beekmantown) 

 age. It was deposited in the interval between the close of the Sin- 

 clair and the beginning of the deposition of the Beaverfoot Hmestones. 

 It may have been deposited by the transgressing Silurian sea or 

 during late Ordovician time. A quartzite at about this horizon in 

 the Beaver Mountains section in northern Utah contains fossils 

 referred to the lower Ordovician (see p. 43). 



The Wonah Quartzite has a thickness of no feet (33.5 m.) at the 

 Sinclair Canyon section, and a quartzite 800+ feet (243.8+ m.), 

 thick, 60 miles (96.5 km.) northwest on the north end of the Beaver- 

 foot Range (Allan) may possibly be of the same age. 



ordovician 

 Glenogle Formation : ^ •': 



This formation is known only from its occurrence near Glenogle 

 station on the Canadian Pacific Railway in Kicking Horse Canyon, 

 and in the north end of the Beaverfoot Range to the south of the 



^ See ante, p. 6. 



