728 ARTHUR C. TROWBRIDGE 



deposit was laid down here, its remnants being represented by the 

 hills. Conditions changed so that erosion took place, the old 

 deposit being dissected into hills and valleys. Later, as the streams 

 were brought to adjustment again, they deposited new fans among 

 the remnants of the old deposit (Fig. 17). 



Due east of Citrus, a series of low spurs projects from the foot of 

 the mountains into Owens Valley. At the foot of the mountains they 

 stand 50-75 ft. above the plain, and become gradually lower west- 

 ward. They are not in direct contact with the present fans, though 

 fans occur at lower levels north and south of them. These projec- 

 tions are not at the mouths of present canyons (Figs. 18 and 19). 



Fig. 18. — Lacustrine beds (light colored) lying against rocks of the Inyo Moun- 

 tains (darker rock to the right), east of Citrus. Stratification may be seen in the left 

 center. .' 



The deposits in Mazourka Canyon, the canyon east of Aber- 

 deen, and on the flanks of the mountains east of Keeler should also 

 be included in this category. In the two canyons, older cemented 

 gravels occur as distinct, flat-topped, but eroded terraces, 50 ft. 

 above the stream beds. East of Keeler, hills of conglomerate 

 rise 200 ft. above present alluvial surfaces. 



Constitution. — The materials of the older deposit at the foot of 

 the Inyos differ from those of the Sierra bajada in various ways; 

 especially in (1) lithological composition, (2) texture and shape of 

 pieces, (3) structure, (4) cementation. 



1. This deposit is made up of fragments of all rocks occurring 

 in the Inyo Mountains, from which they are derived, including 

 both igneous and sedimentary rocks. 



