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. Betula fallax, 
with 32 specimens, has the same degree of relation to Betula nigra, 
Linn., the Red Birch. Populus Nebrascensis, typically and closely allied 
to P. arctica and P. Richardsoni, two very common species of the Arctic 
Miocene, is represented with its varieties by more than 300 specimens. 
Platanus Guillelme, abundant in most of the localities where Miocene 
plants have been found, is represented by 70, and the allied species, 
Platanus aceroides, P. Haydenwi, 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 which 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 Mountains. There were also a few identical species found at 
Golden and Fort Union: Platanus Haydenii, P. Raynoldsii, 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 
