12 



SMITHSONIAN INSTITUTION 



^MF^jg 





l-"iG. 1 1. -Sedimentary deposits of Pleistocene Age. Typically eroded ex- 

 posure near top of plains a few miles northwest of Curtis, Oklahoma. 



Fig. 12. — Cut-bank of Pleistocene and recent deposits in valley fill about 

 6o miles west of Alva, Oklahoma. Bones of mammoth were found at base 

 of bank. 



