PALEOZOIC STRATIGRAPHY OF ROCKY MOUNTAINS 257 



Richmond series above. It is possible that the much thicker 

 massive dolomite characterizing the Upper Bighorn in the Absaroka 

 Range is equivalent to a part of this thin-bedded series (called 

 Member 9), as well as to the underlying more massive beds. On 

 Blacksmith Fork, Member 8 forms the main body of the Upper 

 Fish Haven dolomite. In common with several other parts of the 

 Ordovician system, it is somewhat darker in color there than in 

 Wyoming. 



The highly fossiliferous, thin-bedded dolomites (Member 9) of 

 the Upper Bighorn in the Bighorn Range unfortunately are not 

 typically developed elsewhere. 



There is no representative of the Bighorn in Hintze's 1 section 

 in the central Wasatch, nor in the Uinta Range. 2 



1 F. F. Hintze, Jr., op. cit. 2 F. B. Weeks, op. cit. 



