﻿550 
  DR. 
  W. 
  TEASER 
  HUME 
  ON 
  [Dec. 
  1 
  897, 
  

  

  is 
  the 
  presence 
  of 
  numerous 
  brown 
  nodules, 
  similar 
  to 
  those 
  occurring 
  

   in 
  the 
  Chloritic 
  Marl. 
  

  

  Tate 
  remarks 
  that 
  a 
  lower 
  baud 
  is 
  charged 
  with 
  Vermicularia 
  

   concava, 
  Sow. 
  1 
  It 
  is, 
  however, 
  a 
  higher 
  band 
  that 
  has 
  attracted 
  the 
  

   most 
  attention, 
  being 
  full 
  of 
  large 
  specimens 
  of 
  Exogyra 
  columba, 
  

   Lam., 
  accompanied 
  by 
  an 
  Ostrea 
  (near 
  biauriculata), 
  Trigonia 
  

   crenulata, 
  Lam., 
  a 
  Tellina 
  or 
  Anatina 
  (probably 
  the 
  Anatina 
  

   Royana, 
  d'Orb., 
  mentioned 
  by 
  Tate), 
  Oxyrhina 
  Mantelli, 
  Ag., 
  Oorax 
  

   falcatus, 
  Ag., 
  Ptychodus 
  mammillaris, 
  Ag., 
  Pt. 
  decurrens, 
  Ag., 
  

   and 
  Lamna 
  sulcata, 
  Ag. 
  Pecten 
  asper, 
  Lam., 
  also 
  occurs 
  rarely 
  

   here, 
  and 
  Patellina 
  [Orbitolina~] 
  concava, 
  Lam., 
  | 
  inch 
  in 
  diameter, 
  

   has 
  been 
  obtained 
  in 
  the 
  glauconitic 
  sandstone. 
  Tate 
  also 
  records 
  

   Cucullcea 
  fibrosa, 
  Trigonia 
  dcedalea, 
  Park., 
  Pecten 
  \Janird\ 
  cequi- 
  

   costatus, 
  Lam. 
  ?, 
  Ostrea 
  semiplana, 
  Sow., 
  and 
  Ammonites 
  [Pachy- 
  

   discus~] 
  lewesiensis, 
  Mant. 
  I 
  have 
  been 
  unable 
  to 
  obtain 
  a 
  single 
  

   specimen 
  of 
  the 
  above 
  ammonite, 
  and 
  an 
  Ostrea 
  semiplana 
  from 
  

   Hannahstown, 
  near 
  Belfast, 
  is 
  from 
  the 
  Chloritic 
  Chalk, 
  a 
  higher 
  

   horizon. 
  The 
  highest 
  of 
  the 
  softer 
  beds 
  contains 
  many 
  specimens 
  

   of 
  a 
  crustacean, 
  referred 
  to 
  Callianassa, 
  which 
  is 
  accompanied 
  by 
  a 
  

   Natica 
  and 
  polyzoa. 
  

  

  The 
  junction 
  between 
  these 
  glauconitic 
  sands 
  and 
  the 
  higher 
  beds 
  

   is 
  very 
  obscure, 
  though 
  in 
  the 
  upper 
  part 
  of 
  the 
  glen 
  there 
  is 
  a 
  

   glauconitic 
  sandy 
  limestone 
  containing 
  Belemnitella 
  [Actinocamax'] 
  

   vera 
  (Mil.). 
  This 
  is 
  the 
  rock 
  described 
  by 
  Gault 
  as 
  ' 
  hard 
  green 
  

   speckled 
  chalk, 
  coarsely 
  conglomeratic 
  at 
  the 
  base 
  ; 
  large 
  rounded 
  

   pebbles 
  of 
  quartz 
  and 
  other 
  rocks 
  ; 
  the 
  glauconitic 
  grains 
  are 
  

   very 
  large 
  and 
  thickly 
  scattered 
  throughout, 
  giving 
  the 
  bed 
  its 
  

   well-known 
  name 
  of 
  mulatto-stone. 
  The 
  fossils, 
  except 
  the 
  

   sponges 
  and 
  brachiopods, 
  are 
  broken 
  and 
  worn, 
  being 
  probably 
  

   derived 
  from 
  the 
  waste 
  of 
  an 
  older 
  bed. 
  Sponges 
  are 
  very 
  numerous, 
  

   but 
  other 
  fossils 
  are 
  rare.' 
  2 
  The 
  fauna 
  corresponds 
  in 
  essentials 
  

   with 
  that 
  of 
  the 
  Chloritic 
  Chalk 
  in 
  the 
  Eastern 
  Division, 
  there 
  being 
  

   here 
  a 
  distinct 
  case 
  of 
  unconformity. 
  This 
  rock, 
  which 
  is 
  very 
  rich 
  

   in 
  Ventriadites, 
  and 
  also 
  contains 
  Coeloptychium, 
  Echinocorys 
  scutatus, 
  

   Leske, 
  and 
  fish-teeth, 
  plays 
  an 
  important 
  part 
  in 
  the 
  district 
  now 
  

   under 
  consideration. 
  

  

  The 
  hard 
  White 
  Chalk, 
  2 
  feet 
  thick, 
  which 
  overlies 
  this 
  bed, 
  

   contains 
  but 
  few 
  flints, 
  and 
  is 
  immediately 
  followed 
  by 
  white 
  chalk 
  

   with 
  flints 
  arranged 
  in 
  regular 
  rows. 
  These 
  upper 
  beds 
  will 
  

   probably 
  repay 
  further 
  examination, 
  so 
  far 
  as 
  regards 
  the 
  detailed 
  

   distribution 
  of 
  their 
  fauna. 
  

  

  Black 
  Mountain 
  and 
  Crow's 
  Glen. 
  

   On 
  the 
  slopes 
  of 
  Black 
  Mountain 
  (1272 
  feet) 
  are 
  a 
  number 
  of 
  

   quarries, 
  in 
  which 
  the 
  upper 
  strata 
  of 
  the 
  series 
  are 
  better 
  exposed 
  

   than 
  is 
  the 
  case 
  at 
  Colin 
  Glen. 
  A 
  little 
  to 
  the 
  north, 
  a 
  very 
  

   complete 
  section 
  is 
  obtained 
  in 
  a 
  glen 
  (Crow's 
  Glen), 
  which 
  differs 
  

   but 
  slightly, 
  either 
  as 
  regards 
  thickness 
  or 
  character 
  of 
  succession, 
  

  

  1 
  Quart. 
  Journ. 
  Greol. 
  Soc. 
  vol. 
  xxi. 
  (1865) 
  p. 
  24. 
  

  

  2 
  Proc. 
  Belfast 
  Nat. 
  Field 
  Club, 
  n. 
  s. 
  vol. 
  i. 
  (1877) 
  p. 
  256. 
  

  

  