HELL CREEK BEDS, CERATOPS BEDS AND EQUIVALENTS 203 



horizon is about 250 feet above the Fox Hills and embraces the 

 following list of species: 



Thuya inter rupta Ncwh. 



Sequoia nordenskioldi Hecr. 



Populus avtblyrliyncJia Ward. 



Populus daphnogenoidcs Ward. 



Sapindus grandifoliolus Ward. 



Aristolocliia cordi/olia Ncwb. 



Cclastrus curoinervis Ward. 



Pali rus pealei? Ward. 



Viburnum sp., cf. V. antiquum (Newb.) Hoi. 



13. AREA IN WESTON COUNTY, WYOMING. 



It is quite probable, however, that the beds under consideration 

 can be traced from the area last considered in more or less contin- 

 uous exposures into Weston and Converse counties, Wyoming. In 

 the southwestern portion of the Newcastle quadrangle which lies 

 mainly in the extreme southwestern corner of Weston County, Mr. 

 N. H. Darton^* has described as ' Laramie' the beds in question which 

 overlie the Fox Hills. 



Although Darton does not mention an unconformity between the 

 Fox Hills and the 'Laramie, ' he speaks of the difficulty of drawing 

 the line between them. However, Mr. Barnum Brown found uncon- 

 formable relations between them. He says:^^ 



On Alkali Creek, about 35 miles northwest of Edgemont, S. D., and 

 6 miles north of the Cheyenne River the dinosaur-bearing beds do 

 rest on the marine Fox Hills. In 1901 I obtained characteristic 

 fossils from both formations near their contact at that locality. At 

 that place the conditions are similar to those in the Hell Creek 

 region. 



From the base of the "series of lignite beds overlying the Converse 

 County beds similar to those overlying the Hell Creek beds" on 

 Seven Mile Creek, 40 miles northwest of Edgemont, Brown obtained 

 the following plants: 



Taxodium occidenlale Newb. 

 Sequoia nordenskioldi Heer. 



^' U. S. Geol. Surv., Folio 120, 1904. 



" Bull. Am. Mas. Nat. Hist., vol. 23, 1907, p. 844. 



