396 University of California Publications in Geology [Vol. 9 



Fig 5. Geological Map of a portion of the Jackson Quadrangle. Adapted from 

 the Jackson Folio. Scale, y 2 inch — 1 mile. 



BC, Basement Complex; ng. Auriferous Gravels; ni, lone Formation; nsg, 

 Neocene shore gravels; na, andesitic tuffs; grv, Pleistocene shore gravels; al, 

 alluvium. 



