PLATE 3 



Black Bighorn Casper Hartville Laramie Northern Westof Garden of Arkansas 



Hills Mountains Range Uplift Range Colorado Denver TheGoda Valley 



EXPLANATION 



Sundance 

 {Marine Jurassic) 



Spearfish 

 red beds ^ 



Minnekahta 

 limestone 



Opeche 

 red beds 



Minnelusa I t :-v 



Pahasapa 



Englewood ^ 



Whitewood / 

 iOrdovician) \ 



Limestone 



Li me stone, sandy 



Sandstone, white, grey, bufl^and brown 



Red, sandy shale e 





Red sandstone and conglomerate 





Granite and schist 



Gypsum m large deposits 



o OO 



Much chert 



f^ Fossils 

 C= Cambrian 



Topof Missi SSI p plan 

 E= E><eter sandstone ? 



Bighorn 

 iOrdovician) 



Scale 



1000 Feet 



Chart of Columnar Sections of Carboniferous and ' ' Red Beds ' ' in the western part of the Plains Province. From Darton. 

 This chart gives Darton's correlation of the beds, the author's exceptions are noted in the text. 



