196 CALIFORNIA ACADEMY OF SCIENCES. 



great general similarity with the Sierra Nevada. There is 

 the same gentle western and steep eastern slope — there is 

 the same mainly granitic mass with smaller areas of aurifer- 

 ous metamorphic slate; there are finally the auriferous 

 gravels and the recent volcanic outbursts at the eastern foot. 

 When, going one step further, we consider that the eastern 

 fault of the Peninsular Sierra, lies nearly in the direct S.S. 

 E. continuation of the eastern fault of the Sierra Nevada, 

 the intimate connection of the two ranges becomes still 

 more apparent. 



