6 AGE OF FLORAS [ch. 



referred the Western Norwegian flora to the Middle Devonian, 

 while Halle assigned that of Roragen to the Lower Devonian. 



Russia. In the Devonian of the Donetz Basin in Russia, 

 plants occur associated with a fauna believed to be Upper 

 Devonian. 



Bear Island and Ellesmereland. The Upper Devonian horizon 

 of these beds is determined by the occurrence of fish remains. 



Spitzhergen. In Spitzbergen two floras on different horizons 

 occur associated with fish remains. That of Mimers-Thal is 

 probably Upper Devonian, that of Dickson Bay, Lower Devonian. 



Canada. In New Brunswick, plants occur on at least two 

 horizons, but until these beds have been more carefully studied, 

 it will not be certain whether the higher plant-bearing beds 

 are of Middle or Upper Devonian age. The lower plant horizon 

 of Gaspe is, however, undoubtedly Lower Devonian, as the 

 associated fish remains clearly indicate. 



United States. Plant-bearing beds occur on several horizons 

 in the United States. Of these, the best known at present is the 

 Upper Devonian flora of the Perry Basin (S.E. Maine) probably 

 referable to the Chemung series. In New York State and else- 

 where other plants occur, some of which may be older thau the 

 Upper Devonian. 



Australia. In New South Wales and Victoria, Devonian plant- 

 bearing rocks occur, some of which are believed on strati- 

 graphical grounds to be of Upper Devonian age. Certain plants 

 may even occur on lower horizons, but naturally a strict 

 correlation between these far distant rocks and the Devonian 

 horizons of Europe is a difficult matter. 



The above are here relied upon as the best known Devonian 

 floras of which the horizons have been more or less satisfactorily 

 determined. Isolated members of these floras, particularly 

 examples of Psilophyton, occur in many other countries, such as 

 France and China, but these are not taken into consideration 

 here. 



