58 BULLETIN OF THE 



P. aceroides, Goepp., two species also abundantly distributed in the Ter- 

 tiary, especially the Miocene of both continents. As from the Upper 

 Cretaceous or Senonian measures no species of fossil plants have as 

 yet been recognized as identical with or even related to any of those of 

 the Laramie Group, the assertion that the flora of this last formation is 

 Tertiary in its character remains positive and as yet unrefuted. 



Indeed, as it can be seen in looking over the table of distribution, 

 not only some of the more predominant species of the Flora of the 

 Laramie Group are Miocene in characters ; but some of them are iden- 

 tified with species of the present epoch, or at least closely allied to them. 

 Woodwardia latiloba, for example, represented in the collection by 53 

 specimens, is a near relation of Woodwardia Virginica, Smith, not rare 

 in the woody swamps of the Northern United States. Bettda fallax, 

 with 32 specimens, has the same degree of relation to Betula nigra, 

 Linn., the Red Birch, Populus Nebrascerisis, typically and closely allied 

 to P. arctica and P. Pichardsoni, two very common species of the Arctic 

 Miocene, is represented with its varieties by more than 300 specimens. 

 Platanus Guillelmoe, abundant in most of the localities where Miocene 

 plants have been found, is represented by 70, and the allied species, 

 Platanus aceroides, P. Haydenii, P. Raynoldsii, by 45. The authority 

 of Professor Newberry is still more conclusive on the subject ; for in 

 describing the plants of the Fort Union Group in his Notes on the 

 Later Extinct Flora of North America, he not only finds most of them 

 related to Miocene species, but he identifies four of them with common 

 plants of the present epoch : Onoclea sensibilis, Corylus rostrata, Corylus 

 Americana, and Amelanchier similis, this last considered as a form of the 

 very variable and common Amelanchier Canadensis, Tor. & Gr. 



Formerly, or before the examination of the new specimens sent from 

 Golden was made, I did not consider the Flora of the Union Group as 

 of the same age as that of the Laramie, known as it was to me by the 

 plant remains obtained at Golden, Black Buttes, and Point of Rocks. 

 There were between the plants of these localities and those of Fort 

 Union and the Yellowstone River, some points of affinity, marked in 

 the profusion of Palm remains, especially Sabal, of w^iich the most 

 common species, ^S*. Campbellii, Newby., first described from large speci- 

 mens of the Yellowstone, was found equally abundant at Golden and 

 the Raton IMountains. There were also a few identical species found at 

 Golden and Fort Union ; Platanus Haydenii, P. Baynoldsii, two species 

 of Juglans, two of Cissus, and a Carpolithes. But the facies between 

 the groups appeared different, that of the Union Group being strikingly 



