HELL CREEK BEDS, CERATOPS BEDS AND EQUIVALENTS 223 



occurring at Point of Rocks, Rock Springs, Bhick Buttcs, Evanston, 

 and Carbon, Wyoming, Marshall, Colorado, and the Livingston 

 of Montana. Myrica torreyi is present in the lower Fort Union of 

 Converse County, w^here a single specimen was doubtfully so deter- 

 mined; its principal distribution is in the Montana and Laramie, 

 and also at Black Buttcs. Magnolia tenuinervis was originally 

 described from the Denver, has been found at Black Buttes and 

 Hodge's Pass, Wyoming, and doubtfully in the Montana at Coal- 

 ville, Utah. Palmocarpon palmarum is a fruit of uncertain status. 

 Of the four species of Platanus, two (P. haydenii and P. raynoldsii) 

 are very abundant and widely distributed in both lower and upper 

 members of the Fort Union, and of rare or exceptional occurrence in 

 the Laramie. Of the others, Platanus marginata is found at Point 

 of Rocks and Black Butte?, and in the Laramie at Crow Creek, 

 Colorado, and P. platanoides at Black Buttes and the supposed 

 Montana of the Grand Mesa region of Colorado. Quercus viburn- 

 ifolia is found in Arapahoe and Denver and the Laramie of Crow 

 Creek. Rhamnus salicifolius, reported only from the "Hell Creek 

 beds," is mainly a Laramie species but has been found in the Mon- 

 tana at Rock Springs, Wyoming. Sahallites grayanus is of wide 

 distribution in the Montana, Laramie, Denver, and Livingston; it is 

 usually obscurely preserved and difficult of certain identification. 

 Trapa micro phylla has now been found at so many points from 

 Montana to upper Fort Union that it is of little value in fixing the 

 age of beds. Viburnum whymperi has been found at Point of 

 Rocks, Black Buttes, and in the upper Fort Union. 



It is significant that of the 84 species found in the lower Fort 

 Union only 16 are distributed into the Cretaceous, while no less than 

 68 are confined to the Tertiary. 



As might be expected, the relationship between the flora of the 

 Arapahoe and Denver and that of the lower Fort Union is much 

 stronger, there being some 22 of the 84 species that are common. 

 As the flora of the Arapahoe and Denver now numbers about 200 

 species, it is seen that the species common to the lower Fort Union 

 is not strong enough to bring them together, though, as most of the 

 common species come from the areas nearest to the Denver Basin, it 

 may be shown that the relationship is closer when larger collections 

 from intermediate points are available for comparison, but for the 



