An Unique Region 



181 



Coso range, separated from the Inyo range by a high valley. 

 To the south of Owens Lake is Rose Valley, separated from 

 Owens Valley and Owens Lake by an alluvial divide 3,760 feet 

 above sea level, or 160 feet above Owens Lake. 



Rocks Faulted and Capped by Lava 



The Inyo range (including the White Mountains) is a 

 faulted block, a "horst." (See p. 155, Chap. XIII.) The 

 stratified sedimentary rocks of which the range is made up in- 

 clude those of all ages from pre-Cambrian to Triassic, except 



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Photo by Adolph Knopf, U. S. Geol. Survey 

 FIG. 57. Sierra escarpment, south of Owens Lake. 



Silurian. The rocks are very much broken by faulting. They 

 are upturned, folded, bent, and broken. The southern part of 

 the range east of Owens Lake is capped by a vast lava flow. 

 These lava beds lie horizontally over the eroded ends of Car- 

 boniferous and Triassic rocks that were upheaved into vertical 

 position before the lavas were poured forth. The lava beds are 



