﻿Vol. 
  53.] 
  THE 
  CRETACEOUS 
  STRATA 
  OF 
  COUNTY 
  ANTRIM. 
  593 
  

  

  crenulata, 
  Lam., 
  belong 
  to 
  a 
  higher 
  zone 
  than 
  the 
  beds 
  previously 
  

   described, 
  but 
  are 
  included 
  in 
  the 
  Cenomanian 
  series. 
  

  

  Guillier 
  1 
  has 
  given 
  a 
  long 
  list 
  of 
  the 
  Cenomanian 
  fossils 
  in 
  that 
  

   department, 
  but 
  unfortunately 
  the 
  poverty 
  of 
  the 
  Irish 
  fauna 
  renders 
  

   comparison 
  difficult. 
  Nevertheless 
  Orbitolina 
  concava 
  occurs 
  at 
  the 
  

   base 
  of 
  the 
  French 
  Cenomanian, 
  increasing 
  in 
  abundance 
  in 
  the 
  

   upper 
  strata, 
  till 
  near 
  Le 
  Mans 
  a 
  calcareous 
  yellowish 
  grit 
  containing 
  

   abundant 
  glauconitic 
  grains 
  and 
  numerous 
  quartz-fragments 
  is 
  met 
  

   with, 
  yielding 
  among 
  other 
  fossils 
  Trigonia 
  crenulata, 
  and 
  in 
  lower 
  

   beds 
  Ammonites 
  [Schloenbachia] 
  varians, 
  A. 
  [Acanthoceras] 
  Mantelli, 
  

   and 
  small 
  individuals 
  of 
  Ostrea 
  columba. 
  2 
  

  

  In 
  the 
  Sarthe 
  Exogyra 
  columba 
  gigas 
  and. 
  Gallianassa 
  Archiaci 
  

   also 
  occur 
  in 
  the 
  Turonian. 
  

  

  In 
  the 
  Rhone 
  Basin, 
  as 
  shown 
  by 
  M. 
  Kilian, 
  in 
  the 
  Montagne 
  

   de 
  Lure, 
  3 
  calcareous 
  grits 
  with 
  Exogyra 
  columba, 
  Ammonites 
  [Acan- 
  

   thoceras] 
  rotomagensis, 
  and 
  Trigonia 
  crenulata 
  overlie 
  a 
  glauconitic 
  

   grit 
  filled 
  with 
  Orbitolina 
  concava. 
  

  

  Near 
  Marseilles, 
  at 
  Escragnolles, 
  grits 
  with 
  Exogyra 
  columba 
  

   rest 
  on 
  grits 
  and 
  limestones 
  containing 
  a 
  Rouen 
  fauna, 
  these 
  again 
  

   overlying 
  clays 
  and 
  limestones 
  with 
  Ammonites 
  [Acanthoceras'] 
  Man- 
  

   telli 
  and 
  Orbitolina 
  concava. 
  

  

  In 
  the 
  Gard 
  also, 
  glauconitic 
  marls 
  with 
  Pecten 
  asper, 
  Trigonia 
  

   crenulata, 
  and 
  Orbitolina 
  concava 
  begin 
  the 
  Cenomanian 
  Series, 
  

   being 
  separated 
  from 
  a 
  band 
  with 
  Exogyra 
  columba 
  by 
  a 
  fluvio- 
  

   marine 
  formation. 
  Orbitolina 
  concava 
  is 
  also 
  at 
  the 
  base 
  of 
  the 
  

   Cenomanian 
  in 
  Spain. 
  

  

  Finally, 
  it 
  may 
  be 
  mentioned 
  that 
  in 
  the 
  Orange 
  district 
  the 
  

   Maine 
  beds 
  reappear 
  as 
  a 
  green 
  sandstone 
  or 
  grit 
  with 
  Exogyra 
  

   columba 
  ; 
  but 
  in 
  this 
  instance 
  a 
  bed 
  with 
  large 
  Exogyra 
  columba 
  y 
  

   followed 
  by 
  a 
  marly 
  bluish 
  limestone 
  with 
  Gallianassa, 
  actually 
  

   overlies 
  a 
  limestone 
  containing 
  Turonian 
  ammonites. 
  

  

  "With 
  the 
  above 
  two 
  exceptions, 
  the 
  whole 
  weight 
  of 
  the 
  evidence 
  

   is 
  in 
  favour 
  of 
  the 
  view 
  that 
  the 
  Chloritic 
  Sandstones 
  mainly 
  repre- 
  

   sent 
  the 
  Cenomanian 
  beds 
  of 
  Western 
  England, 
  at 
  the 
  same 
  time 
  

   sharing 
  the 
  shore-line 
  characters 
  of 
  the 
  same 
  strata 
  in 
  the 
  West 
  and 
  

   South 
  of 
  France. 
  It 
  is 
  interesting 
  to 
  note 
  that 
  brown 
  casts 
  of 
  

   bivalves, 
  probably 
  Inoceramus, 
  occur 
  in 
  the 
  sandstones 
  at 
  Colin 
  

   Glen, 
  in 
  this 
  respect 
  recalling 
  the 
  characteristic 
  feature 
  of 
  the 
  

   Chloritic 
  Marl 
  at 
  the 
  base 
  of 
  the 
  Cenomanian. 
  

  

  The 
  lithological 
  characters 
  seem 
  to 
  point 
  to 
  depression 
  and 
  

   subsequent 
  elevation, 
  the 
  lowest 
  or 
  Pecten 
  cequicostatus-beds 
  being 
  

   sandstone, 
  with 
  very 
  small 
  glauconitic 
  grains 
  ; 
  the 
  Exogyra 
  columba- 
  

   layer 
  above 
  is 
  green 
  uncompacted 
  sand 
  with 
  soft 
  calcareous 
  sand- 
  

   stone, 
  the 
  sandstone 
  with 
  but 
  few 
  glauconitic 
  grains 
  subsequently 
  

   reappearing 
  in 
  the 
  Callianassa 
  sub-zone, 
  containing 
  these 
  Crustacea 
  

   in 
  abundance. 
  

  

  There 
  is 
  little 
  doubt 
  that 
  Gault 
  is 
  right 
  in 
  noting 
  a 
  strong 
  uncon- 
  

  

  1 
  ' 
  Geologie 
  de 
  la 
  Sarthe,' 
  pp. 
  244^260. 
  2 
  Ibid. 
  p. 
  226. 
  

  

  3 
  ' 
  Montagne 
  de 
  Lure,' 
  p. 
  293. 
  

  

  Q. 
  J. 
  G. 
  S. 
  No. 
  212. 
  2 
  r 
  

  

  