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AN AMERICAN GEOLOGICAL RAILWAY GUIDE. (COL.) 



Colorado.* 



List of the Geological Formations in Colorado: 

 17. Jurassic. 

 16. Triassic. 

 1. Archaean. (Cold and Silver Mines) 



19. Tertiary. 



Lignitic Group (producing coal.) 



18. Cretaceous, Nos. 2, 3, 4 and 5. 



Ms. I 1 Kansas Pacific R. R. and Branches. 



Ms. | Denver and Boulder Valley Con. 



