2 52 E. C. CASE 



trip from this point west to the mountains was to detect any recur- 

 rence of the Permian Red Beds, but, as will be shown, nothing below 

 the Triassic was found. 



Farther west the breaks of San Juan Arroya or Trujillo Creek are 

 locally known as the Bad Lands; here there is a very considerable 

 exposure of Red Beds. The beds, as in Salavito Arroya, are con- 

 siderably below those which are exposed in the bluff forming the 



Fig. 5. — Larger view of the pillar shown in Fig. 4. The light-blue layer of sandy 

 clay is seen just below the conglomerate cap. Below is red clay. 



western edge of the Staked Plains a few miles to the south. A layer 

 of heavy sandstone and conglomerate, varying rapidly in character, 

 but as a whole very persistent, determines a shelf extending north 

 from the foot of the plains and covered with grass. It is only in 

 the valleys of the streams that it is broken through and the lower 

 part of the section exposed. A short distance to the north the 

 streams run out upon the shelf which is not again broken until 

 the breaks of the Canadian River to the north are reached. A 



