POS T- PLEIS TO CENE ELE VA Tl ON OF INYO RA NGE 3 4 S 



The view of the lake beds taken from the foothills of the 

 Sierra Nevada, looking eastward across Owens Valley, shows the 

 lake beds at a, Fig. 2, at the level of the valley, and various out- 

 crops from point to point toward the foot of the mountain at b. 



SierrtgNei'ada Inyo Ffsngi 



Lake beds 



Oyve/vs Vs/Zey 



Fig. 4. Diagrammatic outline section from the Sierra Nevada to the summit of 

 the Inyo Range, a little north of Waucobi Canyon. 



The lake beds continue up Waucobi Canyon to a point approxi- 

 mately beneath the letter c, where, as previously stated, they are 

 3000 feet higher than the lowest beds at a. 



The view includes the greater part of the Waucobi embay- 

 ment, but does not extend on the north (left) as far as Soldier 

 Canyon. The high point at^ forms the summit of the ridge east 

 of the Waucobi embayment and overlooks Deep Spring Valley 

 to the northeastward. This part of the range, from d to the 

 head of the Waucobi Canyon above c, forms the eastern portion 

 of the block which appears to have been tilted toward the base 

 of the range at a. On the northeastern side the slope of the 

 range extends down to the level of Deep Spring Valley. It was 

 on the southeastern side of this valley that I found evidence of a 

 comparatively recent fault which is of great interest in con- 

 nection with the view that the Inyo Range has been raised to 

 the eastward and tilted to the westward within comparatively 

 recent times. The best locality at which to examine the fault 

 line is on the southern side of the valley, at a point about 

 seventeen miles north of the head of Waucobi Canyon. Here 

 there is evidence that the bottom of the valley is sinking in rela- 

 tion to the mountains on the southeastern side. This is shown 

 by the presence of a comparatively recent fault scarp at the foot 

 of the ridge and the truncating of the spurs along the base of the 

 ridge where the fault scarp is not otherwise defined. Great 

 springs flow out along the line of the fault, and Mr. Lewis Pa3'son 

 informed me that he had been unable to find bottom, by any 



