2l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Organic rcviains. — The most abundant fossils are undetermined 

 forms of cephalopods and gastropods. A study of the fauna indicates 

 a Chazyan age for the Skoki formation.^ 



Observations. — The Skoki formation has not been identified in the 

 Clearwater section (E on map), although it may possibly be present 

 there in the upper part of the limestones that are now included in the 

 Sarbach, immediately beneath the Mount Wilson quartzite. 



It was not recognized in the Glacier Lake area (B on map), but it 

 should be looked for there beneath the Devonian and above the 

 Sarbach. 



RoBSON Formation. Walcott, 1913' 



Type locality. — Robson Peak District, Robson Peak and probably 

 east of Moose Pass. 



Derivation. — From Robson Peak. 



Character. — Bands of thin layers of bluish-gray limestones, with 

 interbedded siliceous, arenaceous, and dolomitic limestones. 



Thickness. — Estimated 500+ feet (152.4+ m.) on Robson Peak. 



Geographic distribution. — Robson Peak and east of Moose Pass, 

 and presumably on the strike of the latter to the north and south. 



Fauna. — None known to a certainty. 



Observations. — This formation is of doubtful value. All the strata 

 included in it may belong to the subjacent Chushina. No Canadian 

 fossils have been found in the debris brought down on the glacier. 

 It was referred by me to the Ordovician in 191 3 because of the 

 presence of a fauna at Billings Butte which was then regarded as 

 of Ordovician age but which is now referred to the Ozarkian. Only 

 the upper 500 feet (152.4 m.) of the Robson formation of 1913 

 are now being even tentatively referred to the Ordovician. 



CANADIAN 



Glenogle Formation. Burling, 1922^ 



Type locality. — Kicking Horse Canyon, in vicinity of Glenogle Sta- 

 tion on the Canadian Pacific Railway, and north end of Beaverfoot 

 Range. 



^ In 1926 Dr. Charles S. Evans of the Canadian Geological Survey secured 

 a collection on the north side of Sinclair Canyon, 11 feet below the Wonah 

 quartzite, that contains a species of Ampyx. This discovery indicates that the 

 uppermost beds assigned to the Glenogle formation, at some places at least, 

 must be separated and placed into a formation of Chazyan age, perhaps into 

 the Skoki.— C. E. R. 



^ Smithsonian Misc. Coll., Vol. 57, No. 12, 1913, p. 336. 



* Geol. Mag., Vol. 59, 1922, p. 456. 



