222 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



The presence in the Sinclair section (N on map) in the Stanford 

 Range ^ of a Hmestone identical in appearance with the gray lime- 

 stones of the Clearwater and Fossil Mountain sections and carrying 

 similar fossils clearly indicates a thin deposit of the Sarbach beneath 

 the Glenogle and above the Mons formation, and from the presence 

 of a variety of Phyllograptus ilHcifoHus Hall and a species of Di- 

 dymograptus in the lower Sarbach of Fossil Mountain, (see p. 283) 

 it is highly probable that the Glenogle shales are the stratigraphic 

 equivalent of a portion of the Sarbach formation. 



Observations. — The Sarbach limestones in the lower Sinclair Can- 

 yon are undoubtedly a portion of a thin deposit or lentil beneath 

 the lower Glenogle. 



Mr. J. F. Walker, of the Geological Survey of Canada, when 

 mapping the geology of the Windermere topographic sheet east of 

 the Columbia River Valley in 1924, found at the head of Windermere 

 Creek near the summit of the Stanford Range a band of compact, 

 dark, bluish-gray limestone beneath the Glenogle shales and above 

 the Mons limestones ; among the fossils he collected from this lime- 

 stone are numerous specimens of a species of Megalaspis that is simi- 

 lar to one from the lower part of the Sarbach formation on the 

 northeast shoulder of Fossil Mountain (see p. 287). Dr. E. O. Ulrich 

 also recognized the genus Shiimardia in the Walker collection, buL 

 I did not find it at Fossil Mountain. Dr. Ulrich considered the species 

 of Megalaspis as closely allied to the M. limbatns of Sweden. This 

 fauna had not before been recognized in America and marks a horizon 

 that must be searched for elsewhere in the Cordilleram area. It may 

 be that it will be found in the limestones above the Mons formation 

 in the Stoddard-Dry Creek or Sinclair sections.^ It should also be 

 looked for in the Clearwater Canyon and Glacier Lake sections of 

 the Lower Sarbach. 



Fauna. — The fauna of the Sarbach is best known in the Clearwater 

 and Fossil Mountain sections (p. 283). where the presence of " Ca- 

 nadian " graptolites and Lecanospira proves the fauna to be of 

 Canadian age. The genera and species as far as determined are listed 

 in the stratigraphic sections. 



OZARKIAN 



The Upper Ozarkian, as defined by the recent work of Ulrich, is 

 represented throughout much of the Canadian Rocky Mountain region 

 where the lower Paleozoic beds are present. Lower Ozarkian fossils 



* Smithsonian Misc. Coll., Vol. 75, No. i, 1924, p. 15. 

 ^ Idem, pp. 16, 22. 



