﻿605 
  Geological 
  Society, 
  

  

  February 
  25fch, 
  1914.— 
  Dr. 
  A. 
  Smith 
  Woodward, 
  F.E.S., 
  President, 
  

   in 
  the 
  Chair. 
  

   The 
  following 
  communication 
  was 
  read: 
  — 
  

  

  ' 
  Correlation 
  of 
  Dinantian 
  and 
  Avonian.' 
  

   By 
  Arthur 
  Vaug-han, 
  M.A., 
  D.Sc, 
  F.G.S. 
  

   The 
  present 
  paper 
  records 
  the 
  results 
  of 
  applying 
  the 
  time-scale 
  

   deduced 
  from 
  the 
  South-AVestern 
  Province 
  to 
  the 
  Belgian 
  sequence, 
  

   and 
  shows 
  that 
  the 
  faunal 
  succession 
  is 
  practically 
  the 
  same 
  in 
  both 
  

   provinces. 
  Even 
  the 
  specialized 
  and 
  locally 
  exaggerated 
  facies 
  

   which 
  form 
  so 
  striking 
  a 
  feature 
  of 
  the 
  Belgian 
  Province 
  (such 
  as 
  

   the 
  'petit 
  granit,' 
  the 
  ' 
  Waulsortian,' 
  and 
  the 
  *■ 
  sub 
  Ice 
  vis 
  oolite') 
  

   have 
  been 
  discovered 
  at 
  certain 
  points 
  of 
  the 
  South- 
  Western 
  

   Province, 
  and 
  they 
  are 
  adumbrated 
  at 
  man}^ 
  others. 
  [If, 
  further- 
  

   more, 
  we 
  extend 
  our 
  researches 
  and 
  compare 
  the 
  Midland 
  and 
  

   Northern 
  developments 
  of 
  England 
  and 
  Wales 
  with 
  that 
  of 
  Belgium, 
  

   striking 
  identities 
  are 
  observed 
  ; 
  for 
  example 
  : 
  — 
  

  

  The 
  ' 
  Brachiopod 
  Beds 
  ' 
  of 
  the 
  Midlands 
  and 
  of 
  Vise 
  are 
  identical. 
  

   The 
  lower 
  ' 
  knolls 
  ' 
  of 
  the 
  Clitheroe 
  area 
  are 
  typical 
  ' 
  Waulsortian.'] 
  

  

  The 
  following 
  are 
  the 
  most 
  important 
  conclusions 
  from 
  the 
  

   Author's 
  work 
  in 
  Belgium 
  : 
  — 
  

  

  I. 
  Physiographical 
  Phenomena. 
  

   The 
  lateral 
  variation 
  of 
  Mid-Avonian 
  lithology 
  is 
  strikingly 
  

   exhibited 
  in 
  a 
  diagram. 
  Minute 
  correlation 
  of 
  the 
  Belgian 
  

   sequence 
  with 
  that 
  of 
  the 
  South- 
  Western 
  Province 
  demonstrates 
  

   that 
  the 
  periods 
  of 
  partial 
  emergence 
  — 
  of 
  the 
  west 
  of 
  the 
  South- 
  

   western 
  Province 
  and 
  of 
  the 
  east 
  of 
  the 
  Belgian 
  Province 
  — 
  took 
  

   place 
  consecutively 
  and 
  not 
  simultaneously, 
  namely 
  : 
  in 
  the 
  South- 
  

   western 
  Province 
  at 
  the 
  close 
  of 
  Cj-time, 
  in 
  Belgium 
  at 
  the 
  

   beginning 
  of 
  Visean 
  time. 
  At 
  the 
  latter 
  period, 
  England 
  and 
  

   Wales, 
  outside 
  the 
  South- 
  Western 
  Province, 
  had 
  sunk 
  below 
  the 
  

   Carboniferous 
  sea. 
  [Simultaneously, 
  however, 
  Ireland 
  was, 
  like 
  

   Belgium, 
  under 
  emergent 
  conditions.] 
  

  

  II. 
  Palseontological 
  Phenomena. 
  

   The 
  palteontological 
  section 
  contains 
  descriptions 
  of 
  several 
  

   gentes 
  that 
  are 
  common 
  in 
  Belgium, 
  but 
  rare 
  in 
  Britain. 
  The 
  

   most 
  interesting 
  portion 
  of 
  the 
  section 
  is, 
  however, 
  that 
  which 
  

   deals 
  with 
  the 
  evolution 
  of 
  the 
  important 
  Carboniferous 
  corals 
  

   and 
  brachiopods. 
  Two 
  illustrations 
  were 
  selected, 
  and 
  were 
  shown 
  

   as 
  lantern-slides 
  :— 
  - 
  

  

  (i) 
  Phylogenetic 
  history 
  of 
  Caniiiia 
  cijlindrica. 
  

   T3 
  1 
  ■ 
  1 
  f 
  K. 
  Eitilophi/Uum. 
  

  

  Belgium 
  only. 
  H 
  rr 
  /t 
  • 
  • 
  ^ 
  ±- 
  • 
  /-n 
  J 
  l, 
  n 
  ■J\ 
  

  

  ° 
  •' 
  iZ. 
  Caiibtiia 
  hasherensis 
  (Endophylloid). 
  

  

  Migration 
  into 
  Britain 
  at 
  y-^C. 
  cyliiidrica, 
  mut. 
  y. 
  

   Britain 
  and 
  Belgium 
  ... 
  ■{ 
  5 
  and 
  S 
  — 
  mature 
  (Campophylloid) 
  Caninia. 
  

   (ii) 
  Fragments 
  of 
  the 
  history 
  of 
  S})iriferina 
  octoplicata, 
  showing 
  variation 
  

   of 
  relative 
  strength 
  of 
  ribs 
  (departure 
  from 
  normality 
  of 
  early 
  stages) 
  — 
  

   the 
  essential 
  characters 
  fixed. 
  

  

  These 
  facts 
  concerniner 
  mio'ration 
  and 
  evolution 
  are, 
  un- 
  

   questionably, 
  the 
  most 
  important 
  results 
  of 
  extending 
  the 
  area 
  or 
  

   observation. 
  

  

  