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1. Castanea c&stanecefolia. Oliogocene ? U. E., to L. M. 



2. Diospyros alaskana. Cret., Lig. Ter., U. Miocene. 



3 Fagus feronice. Oligocene 1 Lig. Ter., M., Pliocene. 



4. Sequoia langsdorfii. Cret., Lig. Ter., L. Miocene. 



5. Taxodium occidentale. Lig. Ter., Oligo., L. Miocene. 



6. Thuya interrupta. Lig. Ter. and Oligocene. 



Castanea castanecefolia occurs in only three other localities, the Horsefly river, Quesnel 

 and Kamloops, of which the first and second are Upper Eocene and the last is Lower 

 Miocene. 



In his catalogue for 1898 Knowlton records this species as found in the Miocene of the 

 John Day basin, Oregon ; but in a revision of this flora at a later date (1902), he notes more 

 specifically that it occurs in the Lower Clarno beds of Cherry creek, which he regards as of 

 Lower Eocene age. It therefore has a definitely Laramie aspect which is only partially offset 

 by its occurrence in the Upper Eocene and Lower Miocene as stated, but is probably sufficient 

 to place it in the Oligocene or Upper Eocene age. 



Diospyros alaskana is found in Canada, only at the Black water river, and we must there- 

 fore look elsewhere for its proper stratigraphical position. In the United States it is an 

 Eocene type, chiefly of Laramie age, though it does not appear to have been found in the 

 Fort Union group, it has, however, been recorded from the Lower Clarno beds of Cherry 

 creek, Oregon, regarded as Lower Eocene. It may be pointed out that, with the exception 

 of Diospyros elliptica, Kn., recorded by Knowlton from the Mascall beds of Van Home's 

 ranch, and regarded as Upper Miocene, and D. virginiana turneri, the genus as a whole, 

 as represented by nineteen out of twenty-one species, is distinctly older than the Miocene, 

 ranging from the Dakota group to the Lignite Tertiary. This relation also holds true of its 

 occurrence in Greenland and Saghalien as shown by Heer. The genus is clearly and strongly 

 Lower Eocene, and the evidence also favours the application of the same view to the species. 



Fagus feronice is at present known to only two localities — the Blackwater river and 

 Quesnel, the latter being Upper Eocene. In the United States this species is known to 

 the Green River station at Elko, Nevada. In Alaska it occurs in the Eocene of Port 

 Graham, and the same horizon holds for Saghalien. In Europe, on the other hand, it ranges 

 from the Oligocene to the Pliocene, being about equally devided between the Lower Eocene 

 and the Upper Miocene. The general tendency of the evidence afforded by this plant 

 would seem to be toward an Oligocene age. 



Sequoia langsdorfii, dealt with elsewhere, has already been shown to afford evidence of 

 a Lower Eocene age, and the same may also be held as true of Thuya interrupta. 



Taxodium occidentale occurs in a large number of localities, both Eocene and Miocene, 

 throuffhout western Canada. It is a well defined constituent of the Porcupine Creek and 



O 



Great Valley groups, and of the Mackenzie river, both of them of undoubted Lignite Tertiary 

 age. This appears in perfect accord with the distribution of the species in the United 

 States, within the limits of the Eort Union group only. It does not appear to have been 

 found in the more recent collections from Alaska. It is found in the Similkameen river, 

 the Horsefiy river and at Quilchena, all of Upper Eocene or Oligocene age. It is also known 

 to the flora of the Tranquille river which is Lower Miocene or Oligocene. 



