TERRESTRIAL DEPOSITS OF OWENS VALLEY 731 



fication. Instead of being in definite layers, as are the deposits 

 at the foot of the mountains, the materials in the canyon are in 

 indefinite lenses and pockets, similar to those of the Sierra bajada, 

 though on a much smaller scale. 



An examination of two detailed sections noted just above Barrell 

 Springs brings out the difference between these deposits and those 

 east of Citrus and Mt. Whitney station: 



1. 



1^ ft Angular fragments the size of cobble, and clay. 



1 ft Well-sorted, very fine gravel. Pinches out in both directions. 



1^ ft Mixture of cobbles and clay. Pinches out upstream. 



1^ ft Clay with some small angular bits of rock. 



1 ft Well-sorted, loose, fairly well-rounded cobbles; average size 



i| in.; one-inch clay layer in middle. 

 3 ft.. Mixture of sand, clay, and gravel; little or no stratification; 



pockety; contains one bowlder one foot in diameter. 



2\ ft Clay, sand, some gravel; poorly sorted. 



25 ft Fine angular fragments; little or no clay or sand; well 



assorted. 



2. Fifty feet down the valley from the last, the following section 

 occurs: 



3 ft Mixture of coarse and fine angular gravel, with clay in the 



interstices; average size of constituents 1 in. in diameter; 

 occasional bowlders 1 ft. in diameter. 



1 ft Moderately fine gravel; little or no clay; no pieces larger than 



3 in. in diameter; pinches out in 12 ft. up valley. 



2 ft Clay and pebbles intermixed; rude layer of cobbles in middle. 



2§ ft Fairly well-sorted gravel, coarser at bottom. Pinches out 



rapidly in both directions. Loosely packed, interstices not 

 filled. 



3 ft Irregularly bedded bowlders, cobbles, fine gravel, clay. 



2 ft Indefinitely bedded fine angular gravel. Average \ in. in 



diameter. 

 1 ft Pockety, coarse gravel, constituents up to 10 in. in diameter. 



In both sections, the materials are slightly cemented. Not a 

 single subdivision of one could be traced 50 ft. to the other. For 

 further details of these materials see Figs. 21 and 22. 



It is thus seen that the materials of Mazourka Canyon differ 

 from the rest of the older deposit at the foot of the mountains in 



