108 Remarks on the Cretaceous, etc. [February, 



cene by Dr. Newberry from the Fort Union group, are iden- 

 tical with those abundantly represented at Golden. If this fact 

 has not been acknowledged by the eminent geologist of New 

 York, the cause is most probably due to the mingling of the 

 specimens submitted to him, which, derived from divers localities, 

 were representatives of two formations, but were labeled as from 

 the same locality, as would be, for example, the specimens of 

 Carbon mixed with those of Golden, or those of Washakie mixed 

 with those of Black Butte. A lot of specimens sent to me by 

 the U. S. Geol. Survey, and labeled Point of Rocks, were certainly 

 obtained from the Washakie group, as all represent Miocene spe- 

 cies without analogy to those collected later by Dr. Hayden at 

 Point of Rocks. This supposition only can explain the aggre- 

 gation in the same geological group, of species like Taxodiinn 

 occidental, the large palms, Sabal Campbelli, the remarkable 

 leaves of Platanus Haydeni, P. Ra -ua, etc., with 



such positively Miocene plants as Sequoia Langsdorffi, the forms 

 of Populus allied to P. arctica, even species of our time, Onoclea 

 sensibilis, Cory/us Americana, C. rcstrata, etc. All this gives to 

 the Union group an evident Miocene facies, and therefore, from 

 this consideration only, and in substituting Miocene for Tertiary, 

 it would be possible and right to say, that no Miocene plant has 

 been found in the Laramie group. 



On the identity of some of the species of plants of the Union 

 group with those of the Laramie, there is no possible doubt. 

 The most abundant remains procured at the Raton mountains, by 

 divers explorations, represent Sabal Campbelli; some of the 

 finest specimens procured at Golden are of Platanus Haydeni 

 and P. RaynoldsL Some large pieces of sandstone, procured at 

 Golden for the Museum of Princeton College, represent both the 

 species figured in the illustrations of Dr. Newberry, Pis. xix and 

 xxi. And as all the specimens I have described from the collec- 

 tion made by the Geological Survey of Dr. F. V. Hayden, are 

 now deposited in the National Museum, the determination of the 

 species can be there critically examined. 



