TERRESTRIAL DEPOSITS OF OWENS VALLEY 733 



mountains immediately to the east. The dissection of the deposit 

 probably took place subsequent to the uplift of the mountains and 

 the draining of the lake. If lacustrine beds corresponding to them 

 were deposited at the foot of the Sierras, they have been covered 

 and concealed by the more recent alluvium. 



The deposits in Mazourka Canyon are obviously not lacustrine, 

 but of stream origin. They were probably laid down on the floor 

 of a mature valley, which was tributary to the lake east of Citrus. 



Fig. 22. — Photograph to show the shapes of the cobble in the terrace of Mazourka 

 Canyon. 



The differences between these deposits and those along the foot of 

 the mountains may be taken as differences characteristic of lacus- 

 trine and fluvial deposits. 



THE PRESENT FANS 

 DISTRIBUTION 



Between Mt. Whitney station and Aberdeen there are nine sepa- 

 rate fans at the foot of the Inyo Mountains. On the map (Plate I) 

 they are numbered 1 to 9, beginning at the south. Of the nine fans, 

 1, 2, 4, and 8 are large, each covering more than a square mile, 

 and 3, 5, 6, and 9 are smaller. All of them occur at the mouths 

 of mountain canyons. The largest one, No. 4, is at the mouth of 

 the largest canyon, Mazourka, though it is not so well shaped as 

 the others. Between the mouths of the main canyons and between 

 the main fans are some patches of alluvium too small to map and 

 not important in any way. These patches occur at the lower ends 



