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University of California. 



| Vol.. 2. 



CORRELATION OF THE AURIFEROUS GRAVELS WITH THE COAST 

 RANGE NEOCENE. 



For a number of years the relation of the auriferous gravels 

 of the Sierra Nevadas to the marine deposit of the Coast Ranges 

 has furnished one of the most important problems in California!! 

 geology. The correlations that have so far been made have 

 been based largely on comparisons of fossil plants. The plant 

 remains from the Coast Ranges, which have been made use of 

 in these correlations, have been obtained at Kirker's Pass, the 

 Railroad Ranch on the western slope of Mt. Diablo, and Corral 

 Hollow near Livermore Pass. The specimens from Kirker's 

 Pass and Railroad Ranch are from the San Pablo formation. Part 

 of those from Corral Hollow are in a peculiar matrix not known 

 to the writer outside of the San Pablo. The flora is much the 

 same at all three localities. To this flora that of the auriferous 

 gravels shows a considerable degree of relationship. It is probable 

 that the difficult problem of the more exact determination of the 

 age of the auriferous gravels will be most satisfactorily solved 

 through comparison of their flora with that of the San Pablo 

 formation. 



University of California, May, i8q8- 



