256 



E. C. CASE 



head of the Conchas Canyon, the party proceeded to Las Vegas 

 Hot Springs. Here the red again appears in vertical layers on the 

 edge of the mountains. This class of exposures is obviously an 

 exceedingly unfortunate one in which to search for vertebrate 

 fossils. The Red Beds had been lost when we ascended to the top 

 of the mesa from the Conchas Canyon, but the nearly horizontal 



Fig. 9. — Cla\'s, sandstones, and impure limestones in the wall of Bull Canyon 

 just south of Montoya. Contrast the horizontal condition of the beds in this the 

 upper portion of the Triassic with the disturbed condition shown in the lower beds 

 (Fig. 3). 



condition of the beds in the sides of the mesa and the Cretaceous 

 cap leave little possibility of doubt that the beds turned up on the 

 sides of the mountains at Las Vegas Hot Springs are the same as 

 those we left a few miles to the east. On the Geological Map of 

 the United States the Red Beds on the flanks of the mountains 

 are called Permian. Girty examined the beds at Las Vegas 

 Hot Springs but was unable to determine their age. A day's 

 careful search by the author in the vicinity of Las Vegas Hot Springs 



