Jurassic Formations in 8. E. Idaho, etc. 



57 



related the Woodside and Thaynes with the Meekoceras 

 zone of southern Idaho (the Lower Triassic of Hyatt and 

 Smith 8 ) and restricted the name Ankareh shale to red 

 beds between the Thaynes formation and a light-colored 



Kanefield 



•Pt.Kall Indian riee. 



Jour .Jaehin^ton Acad.Sci.VI. 



Mansfield 

 Lanes Creek and Freedom 

 Quadrangles, Ida.- Wyo.' 



Veatch 

 Southweetern Wyoming 

 U.S.G.S. Prof. Paper % 



500| 

 1000 



«500 



2000 



2500 

 5000 



5500 



4000 

 4500 

 5000 

 5500 

 6000 



6500 

 7000 

 7500_ 



6000 

 8500 

 9000 

 9500 

 10000 



10500 



Twin Creek form 



Light colored 



> Nugget form. ; 



Thaynes form. 



Woodaide form. 



Fig. 3. Diagram showing thickness, nomenclature, and relations of 

 Triassic and Jurassic formations in southeastern Idaho and southwestern 

 Wyoming. 



sandstone, which he had formerly included in his term 

 Ankareh, but to which he now gave the name Nugget 

 sandstone, using Veatch ? s name for similar beds in 

 southwestern Wyoming. Boutwell's Ankareh and Nug- 



8 Hyatt, A., and ' Smith, J. P. : The Triassic Cephalopod genera of 

 America, TJ. S. Geol. Survey, Prof. Paper No. 40, pp. 17-19, 1905. 



