230 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



During the past three years Mr. Allan has been making a detailed 

 area! survey of the Ice River Valley region east of Leanchoil on the 

 Canadian Pacific Railway, British Columbia. He found a series of 

 thin-bedded gray argillaceous and calcareous slates, weathering red- 

 dish, yellowish, and fawn ; underlain by grayish calcareous slates, 

 shales, and argillites, highly cleaved and phyllitic; and weathering 

 greenish, grayish, reddish, yellowish, and buff, about 2500 feet in 

 thickness, which he has named the Chancellor formation and which 

 he places above the Sherbrookc formation limestones as developed 

 on Mount Dennis, south of Field. 



Above the Chancellor formation Mr. Allan has named a series of 

 massive blue limestones, with included shaly bands, the Ottertail 

 formation, assigning to it a thickness of 1550+ feet. In this lime- 

 stone he collected a Lingidella very much like Lingulella isse Wal- 

 cott, an undetermined species of Agnostiis, and a rather large but 

 undetermined species of Ptychoparia. 



Above the Ottertail formation there is a great series of inter- 

 bedded cherts, cherty limestones, dolomitic limestones, and siliceous 

 and calcareous slates and shales, forming the main portion of Mount 

 Goodsir. This great series over six thousand feet in thickness he 

 designates as the Goodsir formation. In the lower portion of it he 

 collected several species of fossils which were sent tO' me for study. 

 In addition to an obscure species of Agnostus and one small Obolus. 

 four species have been identified and named as follows : 



Obolus mollisonensis, new species 

 Lingulella f allani, new species 

 Lingulella mooscnsis, new species 

 Ceratopyge canadensis, new species 



The discovery of fairly well characterized specimens of tlic trilo- 

 bitic genus Ceratopyge associated with brachiopods of the same gen- 

 eral type as those found in the Ceratopyge shale of Sweden is most 

 important, as it gives the first definite suggestion of a base for the 

 Ordovician in the section along the Canadian Pacific Railway west 

 of the Continental Divide. In Sweden the Ceratopyge shale and 

 limestone are now by general assent placed at the base of the 

 Ordovician, and with our knowledge of the stratigraphy of the upper 

 portion of this section as determined by Mr. Allan I am inclined to 

 agree with him in placing, at least tentatively, the boundary between 

 the Cambrian and Ordovician at the summit of the Ottertail lime- 

 stone and the base of the Goodsir formation. 



