tL 8. GEOLOGICAL SURVEY 



BULLETIN 612 PLATE XII 



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A. PLATTE RIVER AT FORT STEELE, WYO. 



A characteristic view of the Cretaceous rocks in centra! Wyoming. Photograph furnished by Union Pacific 



Railroad Co. 



B. ELK MOUNTAIN. THE NORTH END OF THE MEDICINE BOW RANGE. 



This mountain may be seen during nearly 1 50 miles of the journey over the Union Pacific Railroad. Photograph 



furnished by Union Pacific Railroad Co. 



