﻿TYPES 
  OP 
  THE 
  CAMBRIAN 
  BEDS. 
  

  

  211 
  

  

  Pig. 
  1. 
  — 
  Map 
  showing 
  approximate 
  Boundaries 
  of 
  the 
  two 
  British 
  

   Cambrian 
  Basins 
  and 
  of 
  the 
  intervening 
  Archcean 
  Ridge. 
  

  

  Hiberno-Cambrian 
  Basin. 
  

  

  The 
  representative 
  sections 
  in 
  the 
  two 
  areas 
  may 
  therefore 
  be 
  

   approximately 
  coordinated 
  as 
  follows 
  : 
  — 
  

  

  N. 
  W. 
  Highlands 
  of 
  Scotland. 
  

   f 
  Quartzites. 
  

   Lower 
  Siluriax 
  J 
  Limestones 
  with 
  fossils. 
  

   (LlandeiloBeds?)] 
  Fucoid 
  beds. 
  

  

  ^ 
  Quartzites 
  with 
  Annelids. 
  

  

  Not 
  represented 
  . 
  . 
  . 
  Hiatus 
  

  

  Cambrian. 
  

  

  f 
  Bed 
  sandstone 
  and 
  

   \ 
  Conglomerate. 
  

  

  Welsh 
  District 
  

  

  Lower 
  Silurian 
  

   (Llandeilo) 
  beds 
  

  

  Arenig 
  beds? 
  

  

  Tremadoc 
  beds. 
  

  

  Lingida 
  flags. 
  

  

  Menerian 
  beds. 
  

  

  Cambrian 
  beds. 
  

  

  (Harlecb, 
  Llanberris, 
  

   Longrnynd, 
  and 
  

   St.-David's 
  beds). 
  

  

  