﻿532 
  

  

  MESSES. 
  C. 
  I. 
  GAEDINEE 
  AND 
  S. 
  H. 
  EEYNOLDS 
  ON 
  [Dec. 
  1 
  89 
  7, 
  

  

  sent 
  the 
  exact 
  appearance 
  of 
  limestone-pebbles 
  embedded 
  in 
  shale 
  ; 
  

   and 
  were 
  it 
  not 
  for 
  the 
  gradation, 
  visible 
  at 
  so 
  many 
  points, 
  between 
  

   the 
  uncracked 
  limestone 
  and 
  these 
  beds 
  of 
  limestone-pebbles, 
  the 
  

   origin 
  of 
  the 
  latter 
  would 
  be 
  hard 
  to 
  prove. 
  

  

  The 
  shale-bands 
  intervening 
  between 
  the 
  limestone-bands 
  also 
  

   show 
  signs 
  of 
  disturbance 
  — 
  cracks, 
  now 
  filled 
  with 
  infiltrated 
  mate- 
  

   rial, 
  being 
  numerous. 
  This, 
  too, 
  is 
  evidence 
  of 
  the 
  agent 
  which 
  has 
  

   probably 
  brought 
  about 
  the 
  present 
  rounded 
  form 
  of 
  the 
  originally 
  

   angular 
  fragments 
  of 
  the 
  limestone-bands. 
  There 
  can 
  hardly 
  have 
  

   been 
  sufficient 
  friction 
  between 
  the 
  limestone-fragments 
  and 
  ' 
  the 
  

  

  Fig. 
  3. 
  — 
  Thrust-conglomerate 
  at 
  Priest's 
  Chamber. 
  

  

  [From 
  a 
  photograph 
  by 
  Mr. 
  H. 
  Preston.] 
  

  

  shale 
  to 
  bring 
  about 
  the 
  rounded 
  appearance 
  of 
  the 
  latter, 
  and 
  it 
  is 
  

   to 
  the 
  dissolving 
  agency 
  of 
  infiltrating 
  water 
  that 
  one 
  must 
  look 
  to 
  

   explain 
  the 
  rounded 
  appearance 
  of 
  the 
  fragments. 
  This 
  type 
  of 
  

   conglomerate 
  due 
  to 
  earth-movements 
  may 
  be 
  seen 
  frequently 
  along 
  

   the 
  coast 
  ; 
  but 
  the 
  other 
  type, 
  namely, 
  the 
  thrust-conglomerate, 
  is 
  to 
  

   be 
  seen 
  only 
  at 
  the 
  places 
  where 
  the 
  thrust-plane 
  between 
  the 
  grit 
  

   series 
  and 
  the 
  limestone 
  series 
  is 
  visible, 
  that 
  is, 
  at 
  Priest's 
  Chamber 
  

   and 
  near 
  St. 
  Kenny's 
  Well. 
  

  

  The 
  Point 
  north-east 
  of 
  Priest's 
  Chamber 
  consists 
  of 
  compact 
  

   limestone 
  overlain 
  by 
  bands 
  of 
  limestone 
  and 
  shale, 
  these 
  bands 
  

   being 
  about 
  6 
  inches 
  thick. 
  They 
  pass 
  both 
  laterally 
  and 
  vertically 
  

   into 
  shale 
  interbedded 
  with 
  bands 
  of 
  rounded 
  blocks 
  of 
  limestone, 
  

  

  