BULL. GEOL. SOC. AM. 



\/0L. 18, 1906, PL. 38 



FiGUKE 1. CliOSS-LiEDDI.NG IN THE Du.N'ES OF SEYISTAN 



The scale may be judged from the hat. These dunes move with extraordinary rapid- 

 ity, objects 10 or 12 feet high being buried and exposed again in a single year 



Figure 2. — Detail or cross-beddixg at Seyistax 



Showing the tangeney peculiar to seolian deposits 



AEOLIAN DEPOSITS IN PERSIA 



