360 F. H. KNOWLTON 



the matter definitely. Incidentally it may be mentioned that we 

 were able to confirm in every particular Veatch's mapping of the 

 formations in this vicinity. 



On the west side of the North Platte River, opposite the mouth 

 of the Medicine Bow River, the bluff in the "Laramie" is about 

 a mile back from the river. The beds, which consist of alternations 

 of soft shales and beds of shaly brownish sandstones and numer- 

 ous thin beds of coal, dip to the southeast at angles between 20 

 and 2 5 . From the bluff the surface slopes gently to the stream, 

 and exhibits admirable exposures throughout. A very careful 

 search was made of the "Lower Laramie" section, and although 

 invertebrates pronounced by Dr. Stanton to be of "Laramie" 

 age were found at numerous horizons, not a scrap of bone could 

 be detected. 



The contact between the "Lower Laramie" and "Upper Lara- 

 mie" is very distinct and undoubtedly has been correctly placed 

 by Veatch. There is a distinct change in the dip, apparently 

 a slight change in the strike, and a marked change in the lithology 

 between the lower and upper beds. The basal 300-400 feet of 

 the beds above the line are composed of somber-colored soft sand- 

 stones and shales, often cross-bedded, with occasional small iron- 

 stone concretions, and in every way suggest the "Ceratops beds" 

 to the northeast. Fragments of bone are scattered over the 

 surface, and although no large pieces were secured at this particular 

 point, enough was found to prove the presence of turtles, croco- 

 diles, and dinosaurs. On the strike of these beds at a point about 

 six miles southeast (T23N, R84W) we found in place about 

 300 feet above the base of the "Upper Laramie" beds a number 

 of large vertebrae. These have been studied by Mr. C. W. Gil- 

 more of the U.S. National Museum, and Mr. Barnum Brown of 

 the American Museum of Natural History, and by both pro- 

 nounced unqualifiedly to belong to Triceratops. It is not possible 

 to fix with certainty the species to which these vertebrae belong, 

 since the characters separating the species are drawn mainly from 

 the skull, but Mr. Gilmore permits me to say that it is impossible 

 to distinguish them from vertebrae of certain species from Con- 

 verse County in which both skull and vertebrae are known. It 



