﻿U. 
  S. 
  GEOLOGICAL 
  SURVEY 
  

  

  BULLETIN 
  NO. 
  322 
  PL. 
  XVII 
  

  

  VAQUEROS 
  (LOWER 
  MIOCENE; 
  PELECYPODA 
  AND 
  BRACHIOPODA. 
  

  

  