128 THE UNIVERSITY OF OKLAHOMA 



adjacent surroundings may lead to the discovery of evidence in- 

 dicating much weathering since the engravings were made. For 

 example, these are some pictographs near the one shown in Figure 7. 

 at a somewhat higher level, which are now partly obscured from 

 view by large granite blocks which obviously rolled down the 

 slope after pictures were made. Additional evidence of weathering 

 of various sorts, developed on the rocks since the engravings 

 were made may indicate a considerable age to the writings. 



