﻿Vol. 
  53.] 
  THE 
  CRETACEOUS 
  STRATA 
  OF 
  COUNTY 
  ANTRIM. 
  551 
  

  

  from 
  that 
  observed 
  at 
  the 
  previous 
  locality. 
  In 
  view 
  of 
  this 
  fact, 
  we 
  

   may 
  content 
  ourselves 
  here 
  with 
  noting 
  the 
  variations 
  observed. 
  

  

  1. 
  At 
  the 
  base 
  is 
  a 
  yellowish-green 
  sand, 
  which 
  yielded 
  

   very 
  delicate 
  shells, 
  resembling 
  small 
  Exogyrce. 
  

  

  2. 
  The 
  Glauconitic 
  Sands 
  are 
  of 
  the 
  usual 
  deep-green 
  colour, 
  

   containing 
  Exogyra 
  laevigata, 
  Sow., 
  in 
  abundance, 
  Pecten 
  [Janira~] 
  

   quinquecostatus, 
  Sow., 
  P. 
  [Amussiurri] 
  orbicularis 
  (Mant.), 
  a 
  Littorina- 
  

   like 
  gasteropod, 
  Vermicularia 
  quinquecarinata, 
  B-om., 
  and 
  an 
  unde- 
  

   termined 
  bivalve. 
  

  

  3. 
  There 
  is 
  a 
  passage 
  upward 
  into 
  dark 
  glauconitic 
  marls, 
  

   which 
  at 
  the 
  base 
  contain 
  Vermicularia 
  quinquecarinata, 
  Horn. 
  

  

  4. 
  The 
  Yellow 
  Sandstone, 
  of 
  typical 
  character, 
  is 
  here 
  at 
  least 
  

   25 
  feet 
  thick, 
  and, 
  although 
  not 
  very 
  fossiliferous, 
  yielded 
  Pecten 
  

   cequicostatus, 
  Lam., 
  Rhynclionella 
  convexa, 
  Sow., 
  Vermicularia 
  

   quinquecarinata, 
  B,6m., 
  V. 
  concava, 
  Sow., 
  and 
  fish-scales. 
  

  

  5. 
  The 
  'Chloritic' 
  Sands 
  and 
  Sandstones 
  are 
  also 
  well- 
  

   developed, 
  but 
  whereas 
  the 
  fossils 
  at 
  Colin 
  Glen 
  were 
  mainly 
  in 
  the 
  

   softer 
  sandstones, 
  here 
  they 
  are 
  present 
  in 
  the 
  harder 
  beds. 
  These 
  

   strata 
  consist 
  of 
  three 
  hard 
  sandstone-bands 
  separated 
  by 
  two 
  layers 
  

   of 
  softer 
  greensand. 
  In 
  the 
  lowermost 
  hard 
  stratum, 
  Pecten 
  cequi- 
  

   costatus, 
  Lam., 
  and 
  Vermicularia 
  concava, 
  Sow., 
  are 
  present, 
  Rhyn- 
  

   chonella 
  Schlcenbachi, 
  Dav., 
  being 
  also 
  recorded. 
  The 
  second 
  hard 
  

   band 
  is 
  full 
  of 
  Exogyra 
  columba, 
  Lam., 
  to 
  the 
  apparent 
  exclusion 
  of 
  

   other 
  organisms, 
  while 
  the 
  soft 
  quartzose 
  greensand 
  above 
  contains 
  

   fish-remains 
  (Lamna 
  appendicidata, 
  Ag., 
  etc.). 
  The 
  hard 
  glauconitic 
  

   limestone 
  at 
  the 
  top 
  of 
  the 
  series 
  is 
  apparently 
  unfossiliferous, 
  

  

  6. 
  There 
  is 
  no 
  evidence 
  of 
  Chloritic 
  Chalk 
  in 
  the 
  glen 
  itself, 
  

   but 
  at 
  the 
  limestone- 
  quarries 
  blocks 
  of 
  this 
  rock 
  are 
  lying 
  about, 
  the 
  

   original 
  exposure 
  being 
  unfortunately 
  hidden 
  now. 
  Large 
  specimens 
  

   of 
  Belemnitella 
  mucronata, 
  Schloth., 
  and 
  Echinocorys 
  scutatus, 
  Leske, 
  

   are 
  abundant, 
  accompanied 
  by 
  ammonites 
  (not 
  more 
  closely 
  identi- 
  

   fiable) 
  measuring 
  more 
  than 
  a 
  foot 
  in 
  diameter, 
  Baculites 
  ariceps, 
  

   Lam., 
  Ventriculites, 
  and 
  Cceloptychium, 
  

  

  The 
  White 
  Chalk 
  itself 
  contains 
  Belemnitella 
  mucronata, 
  

   Schloth., 
  Inoceramus-frdLgments, 
  Lima 
  Hoperi, 
  Defr., 
  Nautilus 
  

   Atlas, 
  Whiteaves, 
  and 
  Baculites 
  anceps 
  an°. 
  

  

  Forth 
  River. 
  

  

  This 
  stream, 
  issuing 
  from 
  the 
  hills, 
  has 
  cut 
  a 
  deep 
  channel 
  

   through 
  the 
  basalts, 
  and 
  through 
  the 
  Cretaceous 
  and 
  Triassic 
  rocks. 
  

  

  The 
  lithological 
  succession 
  is 
  not 
  so 
  clearly 
  displayed 
  as 
  in 
  

   previous 
  sections, 
  the 
  White 
  Chalk 
  with 
  Belemnitella 
  mucronata 
  

   resting 
  directly 
  on 
  a 
  hard 
  glauconitic 
  sandstone, 
  which 
  has 
  given 
  

   rise 
  to 
  a 
  small 
  waterfall. 
  The 
  base 
  of 
  the 
  latter 
  rock 
  contained 
  

   many 
  specimens 
  of 
  a 
  Belemnitella-like 
  form, 
  which 
  Mr. 
  Crick 
  has 
  

   identified 
  as 
  Actinocamax 
  Alfridi, 
  Janet, 
  1 
  a 
  species 
  of 
  rare 
  occurrence 
  

   in 
  England. 
  Spondylus 
  spinosus, 
  Sow., 
  is 
  also 
  present. 
  The 
  

  

  1 
  See 
  Janet, 
  Bull. 
  Soc. 
  geol. 
  France, 
  ser. 
  3, 
  vol. 
  xix. 
  (1891) 
  p. 
  720, 
  etc. 
  

  

  