254 



C. W. TOMLINSON 



prophecy has now been demonstrated by the writer's work. The 

 Bighorn dolomite is characteristically developed throughout the 

 length of the Absaroka Range, and has yielded Ordovician fossils 



in the Crandall (Wyoming) and Livingston (Montana) quadrangles. 

 It is a remarkable fact that, although this formation is 438 feet 

 thick in Livingston Peak, it has no known continuation north of 

 that point, nor west beyond the Gallatin Range. 



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