﻿Fig. 
  1. 
  

  

  Fig. 
  1. 
  — 
  Later 
  Lower 
  Cambrian. 
  White 
  areas 
  are 
  lands; 
  ruled, 
  the 
  

   seas; 
  broken 
  lines, 
  the 
  probable 
  seas. 
  

  

  Fig. 
  2. 
  

  

  /- 
  -L> 
  

  

  

  Fig. 
  2. 
  — 
  Later 
  Middle 
  Cambrian. 
  

  

  