THE WOPiK OF RUNNING WATER. 



95 



^f ■> 



Fig. 77. — Detail of bad-land topography. Head of Indian Draw, Washington Co., 

 S. D. Protoceras sandstone on Oreodon clay. (Darton, U. S. Geol. Surv.) 



Fig. 78. — Detail of bad-land topography. Southwest foot of Mesa Verde, Colo. 

 (Matthes, U. S. Geol. Surv.) 



