﻿Vol. 
  53.] 
  THE 
  CRETACEOUS 
  STRATA 
  OF 
  COUNTY 
  ANTRIM. 
  547 
  

  

  careous 
  paste, 
  in 
  which 
  organic 
  remains 
  are 
  numerous. 
  Small 
  single 
  

   chambers 
  of 
  foraminifera, 
  *06 
  mm. 
  in 
  diameter, 
  are 
  the 
  most 
  

   common, 
  though 
  unions 
  of 
  two, 
  three, 
  or 
  more 
  such 
  are 
  very 
  frequent. 
  

   The 
  only 
  identifiable 
  forms 
  are 
  several 
  minute 
  globulcse 
  Textularice, 
  

   •2 
  mm. 
  in 
  length. 
  Nautiloid, 
  rod-like, 
  spiral, 
  spindle- 
  and 
  dumbbell- 
  

   shaped 
  sections 
  are 
  also 
  abundant, 
  the 
  remaining 
  organic 
  constituents 
  

   being 
  unidentifiable 
  calcareous 
  rods 
  ('75 
  mm. 
  in 
  length), 
  sponge- 
  

   meshes, 
  and 
  fragments 
  built 
  up 
  of 
  hexagonal 
  columns 
  closely 
  set 
  

   together. 
  In 
  addition 
  to 
  the 
  above 
  the 
  Chalk 
  contains 
  angular 
  

   grains 
  of 
  quartz, 
  some 
  of 
  which 
  enclose 
  apatite, 
  and 
  irregular 
  green 
  

   patches 
  of 
  glauconite. 
  A 
  pebble 
  of 
  a 
  glauconitic 
  felspathic 
  sand- 
  

   stone 
  is 
  also 
  present, 
  and 
  round 
  its 
  borders 
  the 
  limestone 
  has 
  lost 
  

   all 
  trace 
  of 
  the 
  organic 
  contents, 
  becoming 
  a 
  fine-grained 
  paste, 
  

   and 
  at 
  one 
  point 
  passing 
  into 
  crystalline 
  calcite. 
  Some 
  flakes 
  of 
  

   pyrites 
  are 
  visible 
  in 
  the 
  latter 
  constituent. 
  

  

  Near 
  Maghaberry, 
  2 
  miles 
  east 
  of 
  Soldierstown, 
  greensand 
  is 
  

   said 
  to 
  have 
  been 
  reached 
  at 
  the 
  base 
  of 
  the 
  quarry. 
  It 
  would 
  

   appear 
  from 
  all 
  the 
  cases 
  that 
  have 
  come 
  under 
  my 
  notice 
  in 
  this 
  

   district 
  that 
  this 
  ' 
  greensand 
  ' 
  is 
  in 
  reality 
  a 
  ' 
  mulatto-stone,' 
  the 
  

   true 
  greensand, 
  the 
  ' 
  Glauconitic 
  Sands,' 
  appearing 
  to 
  be 
  entirely 
  

   absent 
  in 
  these 
  localities. 
  At 
  Balmer's 
  Glen, 
  close 
  to 
  the 
  above 
  

   village, 
  beds 
  rich 
  in 
  silicate 
  of 
  iron 
  (probably 
  glauconite) 
  are 
  said 
  

   to 
  have 
  a 
  thickness 
  of 
  5 
  feet. 
  1 
  Similar 
  beds 
  are 
  recorded 
  from 
  

   Mullaghcarton, 
  as 
  occurring 
  between 
  the 
  Chalk 
  and 
  red 
  Triassic 
  

   shales, 
  and 
  also 
  south-east 
  of 
  Kilcorig, 
  near 
  Lisburn. 
  

  

  In 
  this 
  division 
  the 
  junction-beds 
  between 
  the 
  basalt 
  and 
  the 
  

   Chalk 
  are 
  finely 
  exhibited 
  in 
  several 
  localities. 
  At 
  Kilcorig 
  a 
  

   deposit 
  of 
  lignite 
  and 
  red 
  flints 
  underlies 
  the 
  basaltic 
  mass 
  ; 
  while 
  

   at 
  Soldierstown 
  the 
  entrance 
  to 
  the 
  quarry 
  previously 
  mentioned 
  is 
  

   cut 
  through 
  a 
  dyke 
  of 
  considerable 
  breadth. 
  The 
  Chalk 
  on 
  each 
  

   side 
  has 
  a 
  bluish 
  tint, 
  while 
  the 
  flints 
  are 
  coloured 
  various 
  shades 
  

   of 
  pink 
  or 
  red. 
  The 
  basalt 
  itself, 
  for 
  a 
  space 
  of 
  2 
  feet 
  from 
  its 
  

   junction 
  with 
  the 
  Chalk, 
  is 
  split 
  into 
  a 
  number 
  of 
  thin 
  layers 
  running 
  

   parallel 
  to 
  the 
  sides 
  of 
  the 
  dyke. 
  

  

  The 
  Southern 
  Division 
  is 
  characterized 
  : 
  — 
  

  

  1. 
  By 
  the 
  frequency 
  of 
  paramoudras. 
  

  

  2. 
  By 
  the 
  existence 
  of 
  a 
  conglomeratic 
  chalk 
  at 
  the 
  base 
  of 
  the 
  

   white 
  limestone, 
  containing 
  very 
  large 
  pebbles, 
  which 
  point 
  to 
  the 
  

   conclusion 
  that 
  the 
  area 
  from 
  which 
  they 
  were 
  derived 
  could 
  not 
  

   have 
  been 
  far 
  distant. 
  The 
  presence 
  of 
  Belemnitella 
  mucronata 
  in 
  

   the 
  rock 
  leads 
  one 
  to 
  infer 
  that 
  it 
  was 
  formed 
  towards 
  the 
  close 
  of 
  

   the 
  Upper 
  Cretaceous 
  period. 
  

  

  Note. 
  — 
  The 
  officers 
  of 
  the 
  Geological 
  Survey 
  have 
  marked 
  the 
  

   Upper 
  Greensand 
  as 
  occurring 
  along 
  the 
  line 
  of 
  outcrop 
  throughout 
  

   the 
  district. 
  This 
  arises 
  from 
  a 
  misuse 
  of 
  the 
  term 
  Upper 
  Greensand, 
  

   which 
  in 
  most 
  of 
  the 
  Memoirs 
  has 
  been 
  used 
  for 
  mulatto-stone 
  

   (even 
  though 
  the 
  latter 
  contained 
  fossils 
  of 
  higher 
  zones), 
  as 
  well 
  

   as 
  for 
  the 
  underlying 
  Cretaceous 
  Beds, 
  if 
  present. 
  2 
  

  

  1 
  Mem. 
  Geol. 
  Surv. 
  Irel. 
  Expl. 
  Sheet 
  36, 
  p. 
  32. 
  2 
  Ibid. 
  p. 
  10. 
  

  

  2o2 
  

  

  