346 UNITED STATES GEOLCGICAI. SURVEY— TEETIARY FLORA. 



foniiatioii of Altiska, Grcculaiul, aii(] fspecially from (he Fort Union group, 

 with wliicli (he Porcu|iiMe Creek group ai)pcars closely allied. These plants 

 ore: — 



Equisctum species, similar to E. ardicuni, H. 



Glyplosfrohus Europeus, H. 



Srquoia La7tg.sdorj[)il, Brgt. 



Thuya inierrupta., Ny. 



riirngmit.es? species. 



Scirj'us species. 



Populus Richardsoni, H. 



Corylus rostrata. Ait. 



Corylus Americana, Walt. 



Diospyros species. 



Rlininnus concinnus, Ny. 



Carya antiquorum, Ny. 



Juglans cmereal or J. blUnica, U. 



Vihurnu7n pubescens, Pursh. 

 To this, and by comparisons, are added the species catalogued by Heer, 

 from Richardson's collection on the Mackenzie, which, says Prof. Dawson, 

 belong to the same region. They are : — 



1. Gyptostrobus Europceus, H. 



2. Sequoia Langsdorjfi'i, Brgt. 



3. Pinus species 



4. Smilax FrankUni, H. 



5. Poptdus Richardsonl, H. 



6. Populus ardica, H. 



7. Populus Hookeri, H. 



8. Salix Rheana, H. 



9. Betula species. 



10. Corylus MacQuarrii, H. 



11. Quercus Olafseni, H. 



12. Plat an us nceroides, G. 



13. Hcdera McClurii, H. 



14. Pterospermites dental us, H. 



15. Phyllltes aroideus, 11. 



16. Antholithes omissus, H. 



17. Carpolitlfs seminulus, H. 



