﻿SILURIAN 
  ROCKS 
  OF 
  SCANDINAVIA. 
  327 
  

  

  the 
  resemblance 
  between 
  the 
  fauna 
  of 
  the 
  Ceratopyge-limestone 
  

   and 
  that 
  of 
  the 
  underlying 
  beds 
  is 
  so 
  great, 
  that 
  we 
  have 
  much 
  

   difficulty 
  in 
  drawing 
  a 
  boundary 
  between 
  the 
  primordial 
  fauna 
  and 
  

   that 
  which 
  is 
  usually 
  styled 
  Lower 
  Silurian." 
  

  

  Discussion. 
  

  

  Dr. 
  Hicks 
  remarked 
  upon 
  the 
  importance 
  of 
  the 
  paper 
  ; 
  it 
  would 
  

   be 
  a 
  welcome 
  addition 
  to 
  our 
  knowledge 
  of 
  this 
  region. 
  The 
  position 
  

   of 
  the 
  break 
  at 
  the 
  base 
  of 
  the 
  Silurian 
  beds 
  (Upper 
  Silurian 
  of 
  

   Murchison), 
  showing 
  great 
  and 
  widespread 
  movement 
  extending 
  

   into 
  the 
  Scandinavian 
  area, 
  was 
  very 
  interesting. 
  The 
  break 
  does 
  not, 
  

   however, 
  exist 
  everywhere, 
  and 
  therefore 
  does 
  not 
  denote 
  such 
  

   important 
  earth-movements 
  as 
  took 
  place 
  prior 
  to 
  the 
  Cambrian 
  

   or 
  at 
  the 
  close 
  of 
  the 
  Palaeozoic. 
  He 
  was 
  glad 
  to 
  find 
  that 
  Mr. 
  

   Marr 
  agreed 
  in 
  the 
  main 
  with 
  the 
  views 
  he 
  had 
  expressed 
  about 
  

   the 
  physical 
  geography 
  of 
  the 
  Cambrian 
  and 
  Silurian 
  periods 
  and 
  

   the 
  lines 
  of 
  migration. 
  

  

  z2 
  

  

  