8 University of Texas Bulletin ' ■; 



1 



ings in these beds. The layer had a definite relation to the ] 

 seams of bentonite, and, with this additional evidence, I | 

 was confident there was no possible chance of a mistake. i 

 It enabled me to locate not only the right horizon but also ; 

 a horizon in the underlying heavy Comanchean limestone, 

 which is water-bearing, and which must be avoided to pre- 

 vent serious injury to the underground operations. I need , 

 not add that the information obtained was of real practical 

 value in this case. j 



