BULL. GEOL. SOC. AM. 



VOL. 18, 1906 PL. 36 



Figure 1. — A Mesozoic ai.'ueoij.s Foumation 



The subaerial strata of the Fire mountains, in the Tuyok valley of Turfan, 

 showing a layer in formation 10 of page 378. The upper half is ripple-marked and 

 the lower mud-cracked 





■ 



^ 



i 



g 



W^^-::.- 





^^^^^^^fc^^^^ 



P 





■ftHH^^"" 



..] 







^i^^^H 



B^iGuiiE 2. — A MODERN ;eolian Formation 



Cross-bedded seolian sand at the northern base of the Kwen Lun mountains, south 



of the Takla-Makan desert 



TYPES OF SUBAERIAL DESERT DEPOSITS 



