166 



AN AMERICAN GEOLOGICAL RAILWAY GUIDE. (WY.) 



Wyoming, Utah and Nevada. 



BY MR. ARNOLD HAGUE, ASSISTANT GEOLOGIST ON THE UNITED STATES GEOLOGICAL EXPLOR- 

 ATION OF THE 40TH PARALLEL. 



LIST OF GEOLOGICAL FORMATIONS IN THESE TERRITORIES, 



In the region of the Union Pacific and Central Pacific Eailroads. 



Upper Helderberg to Chemung. 



1. At Chalk Bluffs, 15 miles southeast from Cheyenne, the Niobrara Pliocene and "White River 

 Miocene are both exposed, the latter resting unconformably upon the beds of the Laramie 

 Cretaceous. 



2. Both to the north and south of Granite Canon the Paleozoic beds may be seen" resting 

 against the Archaean rocks. 



3. Sherman, the highest station along the line of the Union Pacific Kailroad, lies 8,271 feet 

 above sea-level, and is on the summit of the Colorado Range. 



