﻿540 
  DR. 
  W. 
  FRASER 
  HUME 
  ON 
  [Dec. 
  1 
  89 
  7, 
  

  

  36. 
  The 
  Cretaceous 
  Strata 
  of 
  County 
  Antrim. 
  By 
  Dr. 
  W. 
  Fraser 
  

   Hume, 
  E.G.S. 
  (Head 
  June 
  9th, 
  1897.) 
  

  

  [Plates 
  XLIV 
  & 
  XLV.] 
  

  

  Contents. 
  

  

  Page 
  

   I. 
  Introductory 
  and 
  Descriptive 
  540 
  

  

  (1) 
  The 
  Southern 
  Division 
  545 
  

  

  (2) 
  The 
  Central 
  Division 
  548 
  

  

  (3) 
  The 
  Eastern 
  Division 
  554 
  

  

  (4) 
  The 
  Peninsular 
  or 
  Insular 
  Division 
  565 
  

  

  (5) 
  The 
  Northern 
  Division 
  , 
  567 
  

  

  II. 
  Chemical 
  and 
  Micromineralogical 
  Sections 
  568 
  

  

  III. 
  Conclusions 
  as 
  to 
  the 
  Sequence 
  and 
  Correlaticn 
  of 
  the 
  

  

  Irish 
  Cretaceous 
  Strata 
  585 
  

  

  IV. 
  General 
  Considerations 
  599 
  

  

  Table 
  I 
  facing 
  568 
  

  

  Table 
  II 
  „ 
  584 
  

  

  Table 
  III 
  „ 
  584 
  

  

  Table 
  IY 
  „ 
  598 
  

  

  I. 
  Introductory 
  and 
  Descriptive. 
  

  

  Although, 
  during 
  the 
  last 
  twenty 
  years, 
  the 
  Upper 
  Cretaceous 
  

   strata 
  of 
  England 
  and 
  the 
  Continent 
  have 
  been 
  the 
  objects 
  of 
  detailed 
  

   investigation, 
  the 
  deposits 
  of 
  the 
  same 
  age, 
  which 
  form 
  so 
  con- 
  

   spicuous 
  a 
  feature 
  in 
  the 
  North-east 
  of 
  Ireland, 
  have 
  been 
  practically 
  

   neglected. 
  Two 
  observers 
  only, 
  Prof. 
  R. 
  Tate 
  l 
  and 
  Dr. 
  C. 
  Barrois, 
  2 
  

   have 
  seriously 
  attempted 
  to 
  classify 
  these 
  formations 
  on 
  definite 
  

   palaeontological 
  principles, 
  but 
  the 
  results 
  at 
  which 
  they 
  respectively 
  

   arrived 
  differ 
  in 
  several 
  material 
  particulars. 
  The 
  present 
  paper 
  is 
  

   the 
  outcome 
  of 
  two 
  excursions 
  carried 
  out 
  in 
  the 
  summers 
  of 
  1895 
  

   and 
  1896 
  : 
  the 
  first 
  connected 
  with, 
  and 
  following 
  on, 
  the 
  Geologists' 
  

   Association's 
  visit 
  to 
  County 
  Antrim, 
  under 
  the 
  guidance 
  of 
  Mr. 
  A. 
  

   McHenry 
  ; 
  the 
  second 
  aiming 
  at 
  a 
  more 
  detailed 
  examination 
  of 
  the 
  

   stratigraphy 
  of 
  the 
  same 
  district. 
  The 
  first 
  and 
  second 
  parts 
  will 
  be 
  

   devoted 
  to 
  the 
  consideration 
  of 
  the 
  various 
  sections 
  visited, 
  together 
  

   with 
  an 
  account 
  of 
  the 
  results 
  obtained 
  by 
  applying 
  the 
  methods 
  of 
  

   analysis 
  and 
  microscopical 
  examination 
  previously 
  employed 
  by 
  me 
  

   in 
  considering 
  the 
  Upper 
  Cretaceous 
  zones 
  of 
  the 
  South 
  of 
  England. 
  

   In 
  the 
  third 
  and 
  fourth 
  parts 
  it 
  is 
  proposed 
  to 
  examine 
  the 
  theo- 
  

   retical 
  questions 
  arising 
  out 
  of 
  these 
  researches, 
  dealing 
  with 
  the 
  

   zonal 
  classification 
  of 
  the 
  Irish 
  Cretaceous 
  strata, 
  the 
  probable 
  

   distribution 
  of 
  the 
  land-masses, 
  and 
  the 
  sequence 
  of 
  physical 
  changes 
  

   during 
  the 
  period 
  under 
  consideration. 
  

  

  1 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxi. 
  (1865) 
  pp. 
  15-44 
  & 
  pis. 
  iii.-v. 
  

  

  2 
  ' 
  Recherches 
  sur 
  le 
  Terrain 
  Cretace 
  Superieur 
  de 
  l'Angleterre 
  et 
  de 
  

   l'lrlande,' 
  Lille, 
  1876. 
  

  

  