﻿568 
  DE. 
  W. 
  EKASER 
  HUME 
  ON 
  [DeC. 
  1897, 
  

  

  of 
  the 
  presence 
  of 
  the 
  Glauconitic 
  Sands 
  with 
  Eocogyra 
  laevigata 
  and 
  

   Janira 
  quinquecostata, 
  but 
  these 
  do 
  not 
  as 
  yet 
  appear 
  to 
  have 
  been 
  

   obtained 
  in 
  place. 
  

  

  Downhill 
  to 
  White 
  Park 
  Bay. 
  

  

  Along 
  the 
  northern 
  and 
  north-eastern 
  coasts 
  of 
  Antrim, 
  from 
  

   Downhill, 
  three 
  stations 
  east 
  of 
  Portrush, 
  to 
  White 
  Park 
  Bay, 
  

   the 
  White 
  Chalk 
  is 
  well 
  displayed, 
  the 
  Lias 
  underlying 
  it 
  uncon- 
  

   formably 
  both 
  at 
  Portrush 
  and 
  White 
  Park 
  Bay. 
  It 
  is 
  in 
  this 
  

   region 
  a 
  very 
  compact 
  white 
  limestone, 
  with 
  flint-layers 
  at 
  intervals 
  

   of 
  about 
  4 
  feet. 
  The 
  fossils 
  appear 
  to 
  be 
  of 
  the 
  usual 
  character. 
  1 
  

   At 
  one 
  spot 
  on 
  the 
  east 
  side 
  of 
  White 
  Park 
  Bay 
  Barrois 
  was 
  able 
  

   to 
  make 
  out 
  the 
  following 
  succession 
  : 
  — 
  

  

  Feet. 
  

  

  1. 
  White 
  compact 
  limestone 
  with 
  flints 
  (Belemnitella 
  mucronata 
  1 
  

  

  and 
  Echinocorys 
  scutatus) 
  > 
  100 
  

  

  2. 
  The 
  same 
  with 
  Belemnitella 
  [Actinocamax] 
  quadrata 
  J 
  

  

  3. 
  White 
  limestone 
  with 
  three 
  bands 
  of 
  flints 
  (large 
  Inoceramus- 
  

  

  fragments 
  and 
  Echinocorys 
  gihbus) 
  7 
  

  

  4. 
  White 
  limestone 
  with 
  flints, 
  with 
  Belemnitella 
  [Actinocamax] 
  

  

  vera, 
  Micr 
  aster 
  sp., 
  Marsupites 
  ornatus, 
  Bourgueticrinus 
  ellip- 
  

   ticus, 
  etc 
  5 
  

  

  Below 
  this 
  point 
  the 
  strata 
  present 
  no 
  special 
  features 
  of 
  interest. 
  

  

  My 
  attention 
  has 
  also 
  been 
  called 
  by 
  Mr. 
  W. 
  W. 
  Watts 
  to 
  the 
  

   pinkish 
  marly 
  conglomerate 
  near 
  Ballycastle 
  quay 
  ; 
  but, 
  although 
  

   examined 
  by 
  several 
  members 
  of 
  the 
  Geologists' 
  Association, 
  it 
  has 
  

   not 
  up 
  to 
  the 
  present 
  yielded 
  any 
  conclusive 
  results. 
  The 
  officers 
  

   of 
  the 
  Geological 
  Survey 
  appear 
  to 
  have 
  found 
  Terebratulina 
  gracilis 
  

   in 
  some 
  abundance, 
  but 
  I 
  have 
  hitherto 
  obtained 
  the 
  species 
  in 
  

   Ireland 
  only 
  in 
  specimens 
  of 
  the 
  Spongiarian 
  zone 
  from 
  Hillsport 
  

   (Islandmagee), 
  sent 
  me 
  by 
  Miss 
  Thompson. 
  

  

  The 
  most 
  noticeable 
  points 
  in 
  the 
  Northern 
  Division 
  are 
  : 
  — 
  

  

  1. 
  The 
  great 
  thickness 
  attained 
  by 
  the 
  White 
  Limestone, 
  and 
  the 
  

  

  presence 
  in 
  it 
  of 
  Marsupites. 
  

  

  2. 
  The 
  reappearance 
  of 
  several 
  elements 
  characteristic 
  of 
  the 
  

  

  Eastern 
  Division, 
  such 
  as 
  the 
  Spongiarian 
  layer 
  and 
  the 
  

   Inoceramus-he&s. 
  

  

  3. 
  The 
  presence 
  of 
  Glauconitic 
  Sands 
  with 
  Exogyra 
  laevigata. 
  

  

  II. 
  Chemical 
  and 
  Micro-Mineralogical 
  Sections. 
  

  

  The 
  second 
  portion 
  of 
  this 
  paper 
  is 
  devoted 
  to 
  a 
  chemical 
  and 
  

   microscopical 
  examination 
  of 
  a 
  series 
  of 
  typical 
  rocks, 
  selected 
  from 
  

   the 
  principal 
  lithological 
  or 
  zonal 
  divisions 
  of 
  the 
  Irish 
  Cretaceous, 
  

   the 
  methods 
  adopted 
  being 
  similar 
  to 
  those 
  employed 
  by 
  me 
  in 
  

  

  1 
  For 
  lists 
  see 
  Barrois, 
  ' 
  Recherches 
  sur 
  le 
  Terrain 
  Cretac6 
  Superieur 
  de 
  

   l'Angleterre 
  et 
  de 
  l'lrlande,' 
  Lille, 
  1876, 
  p. 
  206, 
  and 
  Geol. 
  Surv. 
  Irel. 
  Mem. 
  

   Expl. 
  Sheets 
  7 
  & 
  8, 
  pp. 
  45, 
  46. 
  

  

  