BULL. GEOL. SOC. AM. 



VOL. 19. 1907, PL. 3 



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FiouiiB 1. — View in Dry Yali.ey, Utah, hetweex Aba.jo a.\d La Sal Mouxtaix.s 



To show the level floor and desert vegetation : an isolated hill of .Jurassic sandstone 

 with characteristic deflation sculpture, and the distant plateau herder of the valley 

 made of the same sandstone. Photograph hy Cross, lOO.j 



Fkjukb 2. — Casa Colorado, Dry Valley, Utah 



A hill of white Jurassic sandstone with alcoves such as are common in the district. 



Photograph Ijy W. II. .Tackson 



WIND EROSION IN THE PLATEAU COUNTRY 



