722 ARTHUR C. TROWBRIDGE 



2. It is the result of immature weathering in the mountains. 



3. In texture the materials range from clay-like particles, to 

 bowlders 30 ft. in diameter. 



4. Some of the large bowlders are ice-shaped, and some have 

 been shaped slightly by water. 



5. Stratified, partly stratified, and entirely unassorted materials 

 occur in something like equal proportions. 



6. Where stratification exists, the materials are sorted into 

 lenses and pockets, never into uniform, continuous layers. 



Fig. 12. — A pocket of stratified gravel in the Sierra bajada seven miles from the 

 mountains on Lone Pine Creek. 



7. The materials become gradually finer as distance from the 

 mountains becomes greater, at least so far as sub-surface material 

 is concerned. 



8. No fossils were found in the material. 



These features will be discussed after the deposits at the foot of 

 the Inyo Mountains have been described. 



TERRESTRIAL DEPOSITS OF THE INYO MOUNTAINS 



Terrestrial deposits are represented in the Inyo Mountains by 

 two distinct types of materials, of two distinct ages. They will 

 therefore be discussed separately. 



PLIOCENE LACUSTRINE DEPOSITS 



No description of the terrestrial deposits of Owens Valley, and 

 no discussion of the older deposits at the foot of the Inyo Mountains 

 would be adequate without mention of certain lacustrine clays and 



