﻿554 
  DR. 
  W. 
  TEASER 
  HUME 
  ON 
  [DeC. 
  1 
  897, 
  

  

  The 
  Central 
  Division 
  is 
  characterized 
  : 
  — 
  

  

  Lithologically 
  : 
  

  

  1. 
  By 
  the 
  great 
  thickness 
  of 
  those 
  beds 
  which 
  are 
  clearly 
  of 
  

  

  detrital 
  or 
  chemical 
  origin, 
  namely 
  : 
  the 
  Glauconitic 
  Sands, 
  

   Yellow 
  Sandstones, 
  and 
  Chloritic 
  Sandstones. 
  

  

  2. 
  By 
  the 
  marked 
  unconformities 
  existing 
  between 
  the 
  detrital 
  

  

  deposits 
  and 
  the 
  calcareous 
  beds 
  of 
  organic 
  origin. 
  

  

  3. 
  By 
  the 
  frequency 
  of 
  a 
  nodular 
  layer 
  at 
  the 
  base 
  of 
  the 
  

  

  limestone 
  series. 
  

  

  Zonally 
  : 
  

  

  4. 
  By 
  the 
  prominence 
  and 
  richness 
  in 
  organic 
  remains 
  of 
  the 
  zone 
  

  

  of 
  Exogyra 
  columba. 
  

  

  5. 
  By 
  the 
  extreme 
  reduction, 
  if 
  not 
  entire 
  absence, 
  of 
  the 
  zone 
  

  

  characterized 
  by 
  fragments 
  of 
  Inoceramus 
  and 
  Spondylus 
  

   spinosus 
  (see 
  next 
  division). 
  

  

  6. 
  By 
  the 
  exceptional 
  development 
  of 
  the 
  zone 
  of 
  Belemnitella 
  

  

  (Actinocamax) 
  quadrata, 
  especially 
  at 
  Squires 
  Hill. 
  

  

  Palseontologically: 
  

  

  7. 
  By 
  the 
  abundance 
  and 
  large 
  size 
  of 
  the 
  Dimyarian 
  Peleeypoda, 
  

  

  especially 
  the 
  genera 
  Trigonia 
  and 
  Cucullcea, 
  and 
  forms 
  

   like 
  Thetis, 
  in 
  the 
  Glauconitic 
  Sands 
  and 
  Chloritic 
  Sand- 
  

   stones 
  ; 
  and 
  the 
  large 
  size 
  attained 
  by 
  the 
  Monomyarian 
  

   Peleeypoda 
  at 
  the 
  base 
  of 
  the 
  White 
  Chalk, 
  and 
  by 
  Ostrea 
  

   carinata 
  in 
  the 
  Yellow 
  Sandstone. 
  

  

  8. 
  By 
  the 
  great 
  development 
  of 
  gasteropoda 
  and 
  cephalopoda 
  in 
  

  

  the 
  lower 
  beds 
  of 
  the 
  White 
  Chalk. 
  

  

  9. 
  By 
  the 
  abundance 
  of 
  fish-remains 
  in 
  the 
  zone 
  of 
  Exogyra 
  

  

  columba. 
  

  

  (3) 
  Tue 
  Eastern 
  Division, 
  

   from 
  Belfast 
  to 
  Larne 
  (including 
  Islandmagee). 
  

  

  The 
  Geological 
  Survey 
  Memoir, 
  Expl. 
  Sheets 
  21, 
  28, 
  & 
  29, 
  states 
  

   that 
  White 
  Chalk 
  and 
  Chloritic 
  Sandstone 
  have 
  been 
  met 
  with 
  east 
  of 
  

   Carnmoney 
  Hill, 
  but 
  it 
  is 
  impossible 
  from 
  the 
  description 
  to 
  under- 
  

   stand 
  the 
  stratigraphical 
  distribution 
  of 
  the 
  fossils, 
  which 
  include 
  

   Belemnitella 
  mucronata, 
  Schloth., 
  Spondylus 
  spinosus, 
  Sow., 
  Inoce- 
  

   ramus 
  Crispi 
  ?, 
  and 
  Micraster 
  cor-anguinum, 
  Forb. 
  Between 
  Carn- 
  

   money 
  Hill 
  and 
  Woodburn 
  Glen, 
  a 
  distance 
  of 
  5 
  miles, 
  there 
  are 
  

   no 
  important 
  exposures 
  of 
  the 
  Cretaceous 
  rocks, 
  but 
  at 
  the 
  latter 
  

   locality 
  two 
  very 
  complete 
  sections 
  of 
  these 
  strata 
  are 
  observable, 
  

   formed 
  by 
  two 
  streams 
  which 
  cut 
  through 
  the 
  hill 
  at 
  this 
  point. 
  As 
  

   these 
  exposures 
  present 
  almost 
  identical 
  features, 
  the 
  one 
  supple- 
  

   menting 
  the 
  other 
  in 
  details 
  only, 
  their 
  description 
  will 
  be 
  united. 
  

  

  These 
  beds, 
  which 
  have 
  been 
  taken 
  as 
  types 
  both 
  by 
  Tate 
  and 
  

   Barrois, 
  have 
  been 
  also 
  selected 
  as 
  the 
  most 
  suitable 
  for 
  examination 
  

  

  