﻿JURASSIC 
  ROCKS 
  : 
  ALICOOR 
  AREA. 
  7 
  7 
  

  

  hills. 
  This 
  section 
  occurs 
  about 
  one 
  and 
  a 
  half 
  mile 
  north-east 
  

  

  of 
  Cullumbaucum 
  in 
  a 
  deep 
  rain 
  gully 
  which 
  

   Culhimbaucum 
  section, 
  . 
  

  

  has 
  cut 
  mto 
  the 
  side 
  of 
  the 
  hill 
  to 
  a 
  depth 
  of 
  

   20 
  or 
  30 
  feet, 
  and 
  exposes 
  a 
  very 
  ill-compacted 
  sandy 
  clayey 
  matrix 
  

   full 
  of 
  large 
  boulders 
  of 
  quartzite 
  and 
  various 
  granitic 
  rocks, 
  of 
  the 
  kinds 
  

   which 
  occur 
  below 
  the 
  quartzite 
  plateaux 
  of 
  the 
  Naggery 
  mountains.. 
  

   Were 
  it 
  not 
  that 
  such 
  boulder 
  beds 
  with 
  unconsolidated 
  matrices 
  

   occur 
  in 
  several 
  places 
  further 
  south, 
  and 
  underlie 
  beds 
  unequivo- 
  

   cally 
  belonging 
  to 
  the 
  Sripermatoor 
  series, 
  one 
  would 
  be 
  inclined 
  

   to 
  regard 
  this 
  as 
  merely 
  the 
  highly-weathered 
  surface 
  of 
  more 
  com- 
  

   pact 
  conglomerates. 
  No 
  trace 
  of 
  bedding 
  could 
  be 
  seen 
  in 
  this 
  bed, 
  

   which 
  could 
  hardly 
  be 
  expected, 
  as 
  the 
  rush 
  of 
  water 
  requisite 
  to 
  

   move 
  boulders, 
  many 
  of 
  which 
  weigh 
  1, 
  2, 
  or 
  3 
  cwt. 
  and 
  upwards, 
  

   must 
  have 
  been 
  so 
  violent 
  as 
  to 
  heap 
  everything 
  together 
  in 
  the 
  utmost 
  

   confusion. 
  Similar, 
  but 
  less 
  extraordinarily 
  coarse, 
  conglomerate 
  beds 
  

   would, 
  to 
  judge 
  from 
  the 
  debris 
  occurring 
  all 
  over 
  this 
  part 
  of 
  the 
  

   Alicoor 
  hills 
  and 
  over 
  the 
  greater 
  part 
  of 
  the 
  Naikenpolliam 
  hills, 
  

   appear 
  to 
  constitute 
  the 
  main 
  part 
  of 
  the 
  uncompacted 
  beds 
  assigned 
  

   to 
  the 
  Sripermatoor 
  series. 
  Other 
  beds 
  of 
  finer 
  texture 
  are 
  unquestion- 
  

   ably 
  associated 
  with 
  the 
  conglomerates, 
  but 
  the 
  debris 
  of 
  the 
  latter 
  

   effectually 
  conceals 
  everything 
  excepting 
  in 
  a 
  very 
  small 
  number 
  of 
  

   sections. 
  

  

  So 
  thoroughly 
  does 
  this 
  debris 
  obscure 
  the 
  slopes 
  of 
  the 
  hills 
  that 
  

  

  not 
  a 
  single 
  section 
  occurs 
  on 
  the 
  west 
  side 
  of 
  Alicoor 
  hills 
  and 
  on 
  the 
  

  

  west 
  and 
  south 
  sides 
  of 
  the 
  Naikenpolliam 
  hills 
  in 
  which 
  the 
  base 
  of 
  the 
  

  

  Sripermatoor 
  group 
  is 
  seen 
  in 
  contact 
  with 
  the 
  underlying 
  gneissic 
  

  

  rocks. 
  Only 
  in 
  one 
  section 
  is 
  the 
  gneiss 
  seen 
  within 
  a 
  few 
  feet 
  of 
  the 
  

  

  conglomerates, 
  and 
  this 
  occurs 
  immediatelv 
  east 
  

   Suroperam 
  section. 
  J 
  

  

  of 
  the 
  village 
  of 
  Suroperam, 
  where 
  the 
  gneiss 
  is 
  

   exposed 
  in 
  situ 
  at 
  a 
  height 
  of 
  100 
  to 
  150 
  feet 
  above 
  the 
  general 
  level 
  

   of 
  the 
  adjoining 
  plain. 
  The 
  rock 
  is 
  here 
  a 
  fine 
  grained 
  micaceous 
  

  

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