TERRESTRIAL DEPOSITS OF OWENS VALLEY 737 



as 1 in. in diameter. The pieces are distinctly angular. The 

 section follows: 



3 ft Fine clay and gravel, not laminated. 



1 ft clay 



2 ft fine gravel 



\ in clay 



3 ft fine gravel 



2 in clay 



2. Ten feet of material are exposed in the fan northeast of Aber- 

 deen. It is not stratified. Angular bowlders are imbedded in a 

 matrix of clay. 



3. Near the upper end of fan No. 2, a gully affords an exposure. 

 The section consists of both stratified and unstra titled material. 

 In the unstratified parts, the main constituent is clay, in which are 

 imbedded numerous angular bowlders. One 3^ ft. in diameter 

 occurs in a mass of clay. 



4. Distinctly angular alluvium is shown in Fig. 24. 



SUMMARY 



It is apparent from the foregoing that there are two sorts of 

 terrestrial deposits in and at the foot of the Inyo Mountains, of two 

 distinct ages. The first deposits appear to have been made when 

 the mountains were low and bordered by a lake. Mazourka Can- 

 yon had been cut and brought to grade, deposition taking place in 

 its bottom from its mouth up. The deposits of the time are all 

 fine, fairly well sorted in Mazourka Canyon, and very well sorted 

 in Waucobi Canyon and along the mountain foot. 



Conditions so changed that these first deposits were largely 

 removed by erosion. The change was probably brought about 

 by the uplift of the mountains, as the later alluvium is much coarser 

 than the older. After the uplift, new canyons were cut in the 

 mountains, and new fans deposited among the remnants of the old 

 lacustrine deposits. This process is still going on. 



SOME PROBLEMS OF THE TERRESTRIAL DEPOSITS 



The fluvial deposits of Owens Valley, as described above, offer 

 several problems. In some cases the solutions of the problems are 

 simple and obviously correct; in others the solution is not so clear, 



