F O X H I L L S A N D L O W E R M E D I C I N E B O W 



19 



Locality P. 376: southwest sidc of ridgo, SE. \ sec. 1, T. 6 N., R. 90 W., \ mile 

 northcast of thc Kolasch raiich house. 



Both of these locahties were reported to mc by Dr. T. W. Stanton of the U. S. 

 Geological Survey ^ as ha\ing yielded fossil plants from the basal beds of the so- 

 called "Laramie" formation. The exact position of the localities and the arcal 

 distribution of formations in this region are shown in figure 7. 



Alluviura 



SEDIMENTARY 



ROCKS , b 



■z 

 b: 



< 



C 



M 

 Z 



^^ 

 >o 

 o 



Cd 



Medicine Bow 

 formation 



Fox Hills 

 formation 



Lewis 

 stiale 



Williams Fork 

 formation 



IGNEOUS 

 ROCKS 



< 



H 

 a 

 o 



a 



M 



Basalt 



FiG. 7— Geological setting of Localities P. 375 and P. 376. After U. S. Geological Survey Bull. 297. 



In view of the poor exposures in the vicinity of Craig, the measured section 

 given below was taken farther west along the strike, in the dry valley walls of 

 Spring Creek, 24 miles W. 10° N. of Craig. Here the section is well exposed in 

 steeply dipping beds from the Williams Fork formation up through the Lewis, 

 Fox Hills, Medicine Bow, and Post-" Laramie " formations. Exact stratigraphic 

 positions with relation to the units exposed near Craig wereea sily determined by 

 the persistence of the two massive, fossiliferous sandstones of the Fox Hills above 

 the well-defined Lewis shales,^ and the presence in both regions of a persistent coal 



• Stanton, T. W.. written communication. June 8, 19.35. 

 «Hancock, E. T., U. S. Geol. Survey BuU. 757, 22, 1925. 



