142 STANTON & KNOWLTON LARAMIE AND RELATED FORMATIONS. 



Populus hiiglitii, n. sp.* Kn. Greiviopsis saportanea, Lx. 



Quercus platania, Heer. Asimina eocenica, Lx. 



Alnus Jceeferstenii, (Gopp) Ung. Sapindus, n. sp. 



Corylus macquarryi, (Foob.es) Heer. Cissus Iricuspidata, Lx. 



Trapa, n. sp. Fraxinus sp. 



Betula stevensoni, Lx. Magnolia temdraekis, Lx. 

 Platanus sp. 



Of the 15 species identified with previously known forms, no less than 

 7 are found at Carbon, often in great abundance, and 3 of these are known 

 from no other place. Several of the remaining species are reported from 

 Evanston or in higher beds. There can be little doubt as to their affini- 

 ties with Carbon, and we therefore refer these beds provisionally to this 

 horizon. 



It is evident from the preceding notes that the coal-bearing series of 

 the Laramie plains is in large part, if not wholly, older than the true 

 Laramie, as that formation is usually defined, although it yields what 

 has been supposed to be a Laramie flora ; that is, instead of conformably 

 overlying the Fox Hills beds, it is overlain by them or included within 

 them. Such an occurrence is, however, by no means exceptional in the 

 Cretaceous of the northwest. The Belly River series of the Canadian 

 geologists is a coal-bearing formation holding a similar, but perhaps 

 somewhat lower, position in the Cretaceous section. It also has a fresh- 

 water fauna, and a flora consisting mostly of Laramie species. The 

 principal coal bed, near the mouth of Judith river, Montana, is several 

 hundred feet below the top of the Fox Hills beds, and from another Mon- 

 tana locality north of the Musselshell river, Mr Lindgren f has reported 

 several marine Cretaceous species from a bed overlying coal that he re- 

 ferred to the Laramie. Mr R. C. Hills X has found marine Cretaceous 

 fossils above " Laramie " coal beds, with a so-called Laramie flora in 

 western Colorado, and one of the present writers § has collected about a 

 dozen species of plants, including several Laramie species, from a bed at 

 Coalville, Utah, that is overlain bv about 1,800 feet of marine Cretaceous 



i 1 *j 1 



beds. The Fox Hills beds are coal-bearing at Durango, and in the Mesa 

 Verde, in southwestern Colorado, and will doubtless yield a flora of land 

 plants, though no identified species have been recorded from them. 

 During the past season we have also found that the well-known plant 



* Similar to P. arctica, but differing in being generally smaller and in having prominent, ob- 

 tuse teeth, amounting almost to lobes. It is named in honor of Professor W. C. Knight, who did 

 so much to facilitate our investigations. 



f Tenth Census Report, vol. xv, Mining Industries, p. 744. 



X Proc. Colorado Scientific Society, vol. iii, part 3, 1890, p. 381. 



\ Bull. U. S. Geol. Survey, no. 106, p. 42. 



