PROCEEDINGS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. XI, No. 3, pp. 239-293 August 14, 1909* 



THE AGE AND STRATIGRAPHIC RELATIONS OF THE 

 ''CERATOPS BEDS" OF WYOMING AND MONTANA. 



By Timothy W. Stanton, 

 contents. 



Introduction. 



Local Stratigraphy and Paleontology: 



Converse County, Wyoming 241 



Weston County, Wyoming 244 



Hell Creek, Montana 246 



Areas in North and South Dakota 248 



Localities on Yellowstone River in Eastern Montana 251 



Bull Mountains, Montana 254 



Area northeast of Crazy Mountains, Montana 255 



Area east of the Bighorn Mountains near Sheridan, Wyoming. ... 265 



Bighorn Basin 268 



Black Buttes, Wyoming 270 



Area west of Rawlins, Wyoming 274 



Carbon County, Wyoming 276 



General stratigraphic and structural relations 279 



Physiographic conditions near the close of the Cretaceous 280 



Age of the " Ceratops beds. " 



Evidence from the vertebrate fauna 282 



Evidence from the invertebrate fauna 285 



Evidence from the flora 286 



Conclusions 292 



Throughout a large area in Wyoming and Montana the latest 

 marine Cretaceous strata of the region are overlain by a non-marine 

 formation of light-colored sandstones and darker sandy shales in 

 which an interesting vertebrate fauna consisting mainly of large 



♦Author's separates of this paper were distributed July 20, 1909. 

 Published with the permission of the Director of the U. S. Geological 

 Survey. 



Proc. Wash. Acad. Sci., August, 1909. 



