﻿Vol. 
  53.] 
  NEAE 
  BUNMAEON-, 
  CO. 
  WATEEFORD. 
  271 
  

  

  unconformably 
  on 
  the 
  older 
  rocks. 
  Its 
  basal 
  portion 
  varies 
  in 
  

   character, 
  but 
  is 
  always 
  either 
  a 
  breccia 
  of 
  fragments 
  of 
  the 
  under- 
  

   lying 
  Ordovician 
  rocks, 
  as 
  at 
  Dunmore, 
  1 
  or 
  a 
  series 
  of 
  conglomerates 
  

   consisting 
  of 
  rounded 
  or 
  subangular 
  pebbles 
  of 
  variously-coloured 
  

   grits 
  and 
  white 
  vein-quartz. 
  

  

  In 
  the 
  eastern 
  corner 
  of 
  the 
  county 
  the 
  sea-cliffs 
  from 
  Knocka- 
  

   veelish 
  Head 
  round 
  to 
  Brownstown 
  Head 
  are 
  formed 
  of 
  red 
  sandstone 
  

   and 
  conglomerates 
  with 
  the 
  basal 
  breccia 
  about 
  200 
  feet 
  thick, 
  near 
  

   Dunmore. 
  The 
  total 
  thickness 
  of 
  the 
  beds 
  here 
  is 
  about 
  400 
  feet. 
  

   In 
  this 
  district 
  the 
  strata 
  are 
  almost 
  horizontal, 
  the 
  dip 
  being 
  at 
  

   Dunmore 
  only 
  5° 
  S. 
  Along 
  the 
  coast 
  to 
  Brownstown 
  Head 
  the 
  dip 
  

   is 
  to 
  the 
  south-east 
  at 
  an 
  average 
  angle 
  of 
  10°. 
  On 
  the 
  south-eastern 
  

   shore 
  of 
  Binnashark 
  Harbour 
  the 
  dip 
  is 
  to 
  the 
  north-west 
  at 
  about 
  

   the 
  same 
  angle, 
  so 
  that 
  an 
  anticlinal 
  axis 
  occurs 
  here, 
  and 
  seems 
  to 
  

   be 
  in 
  some 
  way 
  connected 
  with 
  the 
  existence 
  of 
  the 
  promontory 
  of 
  

   Brownstown 
  Head, 
  as 
  is 
  more 
  plainly 
  the 
  case 
  with 
  the 
  Kerry 
  

   headlands. 
  

  

  The 
  boundary 
  of 
  the 
  beds 
  then 
  sweeps 
  northward 
  from 
  this 
  point 
  

   past 
  Passage, 
  to 
  the 
  north 
  side 
  of 
  the 
  river 
  Suir, 
  then 
  bends 
  round 
  

   westward, 
  crosses 
  the 
  river 
  again, 
  and, 
  with 
  a 
  mean 
  dip 
  of 
  30° 
  IS"., 
  

   they 
  strike 
  west 
  as 
  a 
  narrow 
  band 
  which 
  expands 
  and 
  rises 
  into 
  the 
  

   Comeragh 
  Mountains. 
  These 
  mountains 
  consist 
  in 
  the 
  main 
  of 
  a 
  

   broad 
  arch 
  of 
  the 
  Old 
  Bed 
  Sandstone 
  beds, 
  dipping 
  steeply 
  to 
  the 
  

   north 
  and 
  south, 
  and 
  resting 
  on 
  the 
  upturned 
  edges 
  of 
  the 
  Lower 
  

   Palaeozoic 
  rocks. 
  2 
  On 
  the 
  southern 
  side 
  of 
  this 
  anticlinal 
  the 
  Old 
  

   Bed 
  dips 
  suddenly 
  and 
  steeply 
  at 
  angles 
  of 
  from 
  60 
  Q 
  to 
  70° 
  beneath 
  

   the 
  valley 
  of 
  Dungarvan 
  and 
  Lismore, 
  reaching 
  the 
  coast 
  at 
  Bally- 
  

   voyle 
  Head, 
  where 
  a 
  fine 
  section 
  of 
  the 
  tilted 
  beds 
  is 
  exposed 
  and 
  

   their 
  unconformable 
  junction 
  with 
  the 
  older 
  rocks 
  plainly 
  seen. 
  

   Details 
  of 
  this 
  section 
  are 
  given 
  by 
  Sir 
  B. 
  Griffith 
  3 
  in 
  his 
  paper 
  on 
  

   * 
  The 
  Order 
  of 
  Succession 
  of 
  the 
  Strata 
  of 
  the 
  South 
  of 
  Ireland.' 
  

   The 
  beds 
  are 
  here 
  about 
  2250 
  feet 
  thick, 
  and 
  the 
  basal 
  portion 
  

   consists 
  of 
  ' 
  alternations 
  of 
  reddish 
  grey 
  and 
  red 
  conglomerates, 
  

   reddish 
  grey 
  compact 
  sandstone 
  and 
  dark 
  red 
  slate, 
  the 
  conglomerate 
  

   predominating.' 
  A 
  good 
  diagrammatic 
  sketch 
  of 
  this 
  section 
  is 
  

   given 
  in 
  the 
  Survey 
  Memoir 
  already 
  quoted/ 
  

  

  The 
  thickness 
  of 
  the 
  beds 
  in 
  the 
  Comeragh 
  Mountains 
  is 
  about 
  

   3200 
  feet. 
  Towards 
  the 
  north, 
  south, 
  and 
  east, 
  they 
  are 
  thus 
  seen 
  

   to 
  become 
  attenuated. 
  Sir 
  B. 
  Griffith 
  also 
  notes 
  (op. 
  cit.) 
  that 
  

   conglomerate 
  forms 
  the 
  base 
  of 
  the 
  Old 
  Bed 
  in 
  these 
  mountains, 
  and 
  

   in 
  the 
  Cahirconree 
  and 
  Slievemish 
  Mountains 
  of 
  the 
  Dingle 
  penin- 
  

   sula 
  of 
  Kerry, 
  and 
  also 
  in 
  the 
  Galtees 
  and 
  Slievenaman 
  Mountains 
  of 
  

   Limerick 
  and 
  Tipperary. 
  Thus 
  the 
  presence 
  of 
  conglomerates 
  at 
  the 
  

   base 
  seems 
  a 
  feature 
  of 
  the 
  Old 
  Bed 
  of 
  the 
  South 
  of 
  Ireland. 
  This 
  

   point 
  was 
  emphasized 
  by 
  Mr. 
  John 
  Kelly 
  in 
  1856, 
  5 
  and 
  by 
  Prof. 
  Hull 
  

  

  1 
  Explan. 
  Sheets 
  167, 
  etc. 
  Geol. 
  Surv. 
  Irel. 
  (1865) 
  p. 
  13. 
  

  

  2 
  J. 
  Beete 
  Jukes, 
  Journ. 
  Geol. 
  Soc. 
  Dublin, 
  vol. 
  v. 
  (1852) 
  p. 
  147. 
  

  

  3 
  Journ. 
  Geol. 
  Soc. 
  Dublin, 
  vol. 
  iii. 
  (1845) 
  p. 
  150. 
  

  

  4 
  Explan. 
  Sheets 
  167, 
  etc. 
  p. 
  60, 
  fig. 
  7. 
  

  

  5 
  J. 
  Kelly, 
  Journ. 
  Geol. 
  Soc. 
  Dublin, 
  vol. 
  vii. 
  (1856) 
  p. 
  115. 
  

  

  