﻿Vol. 
  53.] 
  THE 
  CEETACEOUS 
  STEATA 
  OF 
  COUNTY 
  ANTRIM. 
  541 
  

  

  My 
  thanks 
  are 
  due 
  to 
  the 
  following 
  members 
  of 
  the 
  Belfast 
  

   Naturalists' 
  Field 
  Club, 
  who 
  have 
  freely 
  placed 
  their 
  local 
  know- 
  

   ledge 
  and 
  experience 
  at 
  my 
  disposal 
  : 
  — 
  Miss 
  Sydney 
  Thompson 
  ; 
  

   Mr. 
  A. 
  McHenrv, 
  M.R.I.A. 
  ; 
  Mr. 
  S. 
  A. 
  Stewart, 
  F.L.S. 
  ; 
  Mr. 
  W. 
  

   Swanston, 
  F.G.S. 
  ; 
  Mr. 
  J. 
  St. 
  J. 
  Phillips; 
  Mr. 
  E. 
  S. 
  Bell; 
  and 
  

   Mr. 
  McLean. 
  Messrs. 
  A. 
  Smith 
  Woodward, 
  F.G.S. 
  ; 
  G. 
  C. 
  Crick, 
  

   F.G.S. 
  1 
  ; 
  A. 
  J. 
  Jukes-Browne, 
  F.G.S. 
  ; 
  R. 
  B. 
  Newton, 
  F.G.S. 
  ; 
  

   Dr. 
  J. 
  W. 
  Gregory, 
  F.G.S. 
  ; 
  Dr. 
  G. 
  J. 
  Hinde, 
  F.R.S. 
  ; 
  and 
  Mr. 
  F. 
  

   Chapman, 
  A.L.S., 
  have 
  also 
  rendered 
  valuable 
  special 
  assistance 
  in 
  

   the 
  examination 
  and 
  identification 
  of 
  the 
  organic 
  remains, 
  the 
  last- 
  

   named 
  contributing 
  a 
  special 
  report 
  on 
  the 
  foraminiferal 
  casts. 
  I 
  am 
  

   also 
  much 
  indebted 
  to 
  Prof. 
  J. 
  W. 
  Judd, 
  C.B., 
  F.R.S., 
  for 
  enabling 
  

   me 
  to 
  carry 
  out 
  my 
  chemical 
  and 
  microscopical 
  work 
  in 
  the 
  Research 
  

   Laboratory 
  of 
  the 
  Royal 
  College 
  of 
  Science, 
  and 
  for 
  having 
  placed 
  

   the 
  whole 
  of 
  his 
  Irish 
  collection 
  at 
  my 
  disposal. 
  2 
  

  

  It 
  will 
  not 
  be 
  necessary 
  to 
  recapitulate 
  the 
  results 
  arrived 
  at 
  by 
  

   writers 
  previous 
  to 
  the 
  year 
  1865, 
  as 
  this 
  has 
  already 
  been 
  done 
  by 
  

   Tate 
  and 
  Barrois 
  in 
  the 
  works 
  previously 
  referred 
  to. 
  Tate 
  was 
  

   the 
  first 
  to 
  clearly 
  recognize 
  the 
  lithological 
  divisions 
  of 
  the 
  Cre- 
  

   taceous 
  system 
  as 
  they 
  are 
  developed 
  in 
  the 
  neighbourhood 
  of 
  Belfast, 
  

   and 
  seeing 
  that 
  these 
  will 
  be 
  constantly 
  referred 
  to 
  in 
  the 
  sequel, 
  it 
  

   may 
  be 
  convenient 
  to 
  define 
  them 
  at 
  once. 
  They 
  are 
  in 
  descending- 
  

   order 
  : 
  — 
  

  

  1. 
  "White 
  Limestone 
  or 
  Hard 
  Chalk. 
  

  

  2. 
  Chloritic 
  Chalk. 
  

  

  3. 
  Chloritic 
  Sands 
  and 
  Sandstones. 
  

  

  4. 
  Grey 
  Marls 
  and 
  Yellow 
  Sandstones 
  with 
  Chert. 
  

  

  5. 
  Glauconitic 
  Sands. 
  

  

  The 
  White 
  Limestone 
  is 
  practically 
  a 
  hard 
  white 
  chalk, 
  in 
  

   general 
  containing 
  well-marked 
  layers 
  of 
  fiint. 
  ■ 
  

  

  The 
  term 
  ' 
  Chloritic 
  Chalk 
  ' 
  has 
  become 
  so 
  well 
  established 
  in 
  

   the 
  literature 
  of 
  the 
  subject 
  that 
  to 
  attempt 
  to 
  alter 
  it 
  would 
  tend 
  

   to 
  confuse 
  rather 
  than 
  to 
  simplify 
  the 
  nomenclature. 
  At 
  the 
  same 
  

   time, 
  it 
  must 
  not 
  be 
  forgotten 
  that 
  the 
  green 
  grains 
  in 
  the 
  rock 
  

   which 
  were 
  formerly 
  believed 
  to 
  be 
  chlorite 
  would 
  probably 
  now 
  

   be 
  classed 
  with 
  glauconite. 
  Typically, 
  Chloritic 
  Chalk 
  is 
  a 
  pink- 
  

   coloured 
  limestone, 
  having 
  minute 
  green 
  grains 
  of 
  glauconite 
  

   scattered 
  through 
  it. 
  

  

  The 
  'Chloritic' 
  Sands 
  and 
  Sandstones 
  are 
  among 
  the 
  most 
  

   variable 
  members 
  of 
  the 
  series, 
  and 
  are 
  thus 
  described 
  by 
  Tate 
  (02?. 
  

   cit. 
  p. 
  23) 
  : 
  — 
  ' 
  The 
  beds 
  between 
  the 
  Grey 
  Marls 
  and 
  the 
  White 
  

   Limestone 
  are 
  generally 
  siliceous 
  sands 
  in 
  a 
  calcareous 
  paste, 
  and 
  

   contain 
  disseminated 
  chloritic 
  grains. 
  The 
  compactness 
  of 
  this 
  zone 
  

  

  1 
  To 
  Mr. 
  Crick 
  I 
  am 
  especially 
  indebted 
  for 
  assistance 
  in 
  the 
  examination 
  

   and 
  identification 
  of 
  the 
  cephalopoda 
  mentioned 
  in 
  this 
  paper, 
  most 
  of 
  the 
  

   notes 
  appended 
  on 
  this 
  subject 
  being 
  the 
  result 
  of 
  my 
  conversations 
  with 
  him. 
  

  

  2 
  For 
  the 
  beautiful 
  photograph 
  of 
  the 
  conglomerate 
  at 
  Murlough 
  Bay 
  I 
  have 
  

   to 
  express 
  my 
  hearty 
  thanks 
  to 
  Mr. 
  J. 
  R. 
  Welch, 
  of 
  Belfast. 
  

  

  