RED BEDS BETWEEN WICHITA FALLS AND LAS VEGAS 259 



of this cannot as yet be suggested. Undoubtedly the Wichita 

 Mountains furnished much of the sediments of the Texas and 

 Oklahoma beds, but where the western land mass lay and what were 

 its limits are yet uncertain. Many suggestions have risen as to its 

 possible outlines but the discussion of the evidence is beyond the 

 limits of this paper. 



