﻿PLATE 
  XIX. 
  

  

  Monterey 
  (Middle 
  Miocene) 
  Diatoms. 
  

  

  Fig. 
  1. 
  Photomicrograph 
  of 
  slide 
  of 
  partially 
  cleaned 
  diatomaceous 
  shale 
  material 
  

   from 
  the 
  Lompoc 
  quadrangle, 
  X 
  100. 
  All 
  the 
  larger 
  individuals 
  and 
  

   fragments 
  are 
  Coscinodiscus 
  oculus 
  iridis 
  Ehrenberg. 
  

  

  Fig. 
  2. 
  Photomicrograph 
  of 
  slide 
  of 
  diatoms 
  from 
  the 
  Monterey 
  shale 
  at 
  Santa 
  Monica, 
  

   Los 
  Angeles 
  County, 
  Cal 
  , 
  X 
  60. 
  Nearly 
  all 
  the 
  species 
  shown 
  on 
  this 
  

   slide 
  occur 
  in 
  the 
  diatomaceous 
  deposits 
  in 
  the 
  Santa 
  Maria 
  district. 
  

  

  140 
  

  

  I 
  

   • 
  

  

  