346 CHARLES D. WALCOTT 



means at his command, in the large pools into which the springs 

 flow, and that where wagons formerly crossed, at the south- 

 eastern end of the flat surrounding the springs, animals are fre- 

 quently mired in the soft mud of the flat. The fault cuts through 

 the Pleistocene, leaving a northward-facing wall from twenty 

 to thirty feet in height overlooking the pools and bogs. A 

 distant view of the ridge on the southeastern side of the valley is 

 shown in Fig. 5. The fault scarp mentioned is directly beneath 

 a, and the extension of the fault crosses the ridge a little to the 

 right of a. 



The eastern slopes of the Inyo Range ten miles south of 

 Waucobi Canyon, and south of the road which passes east from 

 the divide to Saline Valley, are very steep and join the bottom 

 of Saline Valley as abruptly as the ridge on the southeastern side 

 of Deep Spring Valley meets the level valley bottom. (Fig. 5.) 

 Until a good topographic map of this region is made, it will be 

 impossible to trace and connect the relations of the various faults 

 and evidences of comparatively recent disturbance ; but I think 

 that there is sufficient evidence in the sinking of the southern 

 margin of Deep Spring Valley, in the phenomena observed to 

 the south in Saline Valley, and in the position of the Waucobi 

 lake beds, to sustain fairly well the view that the range has been 

 elevated to the eastward and tilted to the westward. 



The total amount of the uplift cannot be accurately deter- 

 mined, as there was undoubtedly a slope at the bottom of Waucobi 

 Lake from its margin toward the present site of Owens Valley. 

 It was probably not much greater than, if as great as, the elevation 

 of the present divide south of Owens Lake, which is about 220 

 feet. It is to be borne in mind, however, that perhaps in the tilt- 

 ing of the range the western edge under Owens Valley has been 

 depressed, and that the valley has been silted up by the wash 

 brought down by the river and from the adjoining mountains, 

 quite as rapidly as, if not more rapidly than, the tilting of the 

 Inyo Range has carried down the floor of the valley. If this is 

 correct, the total elevation of the range since the lake beds were 

 deposited may be as great as or greater than the difference in the 



