RED BEDS BETWEEN WICHITA FALLS AND LAS VEGAS 253 



section of the upper portion of the Triassic taken on the west side 

 of the plains just west of Adrian is as follows : 



Tertiary marl 6-20 feet 



Fine white sandstone 20 



Red clay 10 



Red sandstone or hard sand 12-15 



Dark-red clay containing a layer of variable sandstone and 

 conglomerate 20+ 



It is the conglomerate at the base of the section which forms 

 the top of the shelf described above; it rises and falls in the layer 



Fig. 6. — -Variegated clays of Triassic age in the Bad Lands of Trujillo Creek. The 

 remnants of the conglomerate cap may be seen. The clays are red, purple, and light 

 orange. 



of clay and changes its character very suddenly, being strongly 

 reminiscent of the conditions in the Clear Fork beds. In the breaks 

 of the streams mentioned above the conglomerate forms the top of 

 the section. A general section in the Bad Lands of Trujillo Creek is 

 as follows: 



1. Conglomerate (top). Grayish in general, but locally reddish 

 and overlain by red sandstone in places. The pebbles variable in 

 size and character. Some thin layers of clay and shale. In places 

 replaced by sandstone (in one place a true arkose). 



2. Thin, blue, sandy clay; very persistent just beneath the con- 

 glomerate and frequently much distorted, apparently by local 

 movements due to pressure. From 6 to 12 inches thick. 



