346 U:>I1TED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



formation of Alaska, Greenland, and especially from the Fort Union group, 

 with which the Porcupine Creek group appears closely allied. These plants 

 are: — 



Equisetum species, similar to E. arcticum, H. 



Glyptostrohus Europeus, H. 



Sequoia Langsdorffii, Brgt. 



Thuya inten-upta, Ny. 



Phragmitesl species. 



Scirpius species. 



Populus Rlchardsoni, H. 



Corylus rostrata. Ait. 



Corylus Ainericana, Walt. 



Diospyros species. 



Rluunnus concinnus, Ny. 



Carya antiquorum, Ny. 



Juglans cinerea? or J. bilinica, U. 



Vibwnum 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 Langsdorffil, Brgt. 



3. Finns species 



4. Smilax Franklini, H. 



5. Popidus Rlchardsoni, 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 anus aceroides, G. 



13. Hedera McClurii, H. 



14. Pterospermites dentatus, H. 



15. PhylUtes aroideus, H. 



16. AntholitJies omissus, H. 



17. Carpolithfs seminulus, H. 



