GEOLOGICAL WORK OF THE ATMOSPHERE 101 



Fig. 62. Wind erosion. Cave rocks near Sierra La Sal, in Dry Valley, Utah. 

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



Fig. 63. Wind erosion. Casa Colorado, Dry Valley, Utah, between Abajo 

 and La Sal Mountains. La Plata (Jurassic) sandstone. (Cross, U. S. 

 Geol. Surv.) 



