﻿32 
  POOTE 
  : 
  GEOLOGY 
  OF 
  MADRAS. 
  

  

  South 
  of 
  the 
  Cunm 
  river, 
  on 
  the 
  principal 
  laterite 
  area, 
  small 
  patches 
  

   Near 
  Chumbrumbau- 
  onl 
  ^ 
  occm 
  '> 
  except 
  around 
  and 
  to 
  the 
  south-west 
  of 
  

   cxim 
  tank. 
  ^ 
  e 
  g 
  rea 
  £ 
  Chumbrumbaucum 
  (Sembarampakkam) 
  

  

  tank. 
  On 
  the 
  north 
  and 
  south 
  sides 
  of 
  this 
  huge 
  tank 
  large 
  areas, 
  

   each 
  several 
  square 
  miles 
  in 
  extent, 
  are 
  almost 
  entirely 
  covered 
  by 
  the 
  

   conglomerate, 
  the 
  latter 
  being 
  largely 
  exposed 
  on 
  the 
  higher 
  grounds. 
  

   Very 
  few 
  quartzite 
  pebbles 
  of 
  large 
  size 
  are 
  here 
  seen, 
  and 
  the 
  laterite 
  

   is 
  as 
  typical 
  as 
  at 
  the 
  Red 
  Hills. 
  

  

  A 
  very 
  good 
  display 
  of 
  the 
  laterite 
  occurs 
  still 
  further 
  south- 
  

  

  T 
  , 
  , 
  , 
  west 
  near 
  Irumbedu 
  and 
  near 
  Sripermatoor. 
  The 
  

  

  Near 
  Irumbedu 
  and 
  r 
  

  

  Sripermatoor. 
  most 
  southerly 
  laterite-spread 
  of 
  any 
  magnitude 
  

  

  in 
  this 
  part 
  of 
  the 
  Madras 
  District 
  occurs 
  at 
  and 
  around 
  Oragidam 
  

  

  (Woodagurm 
  of 
  Atlas 
  sheet), 
  eight 
  miles 
  south 
  of 
  

  

  Near 
  Oragidam. 
  . 
  

  

  Sripermatoor. 
  South-westward 
  of 
  Sripermatoor 
  

  

  the 
  laterite 
  already 
  shows 
  a 
  marked 
  increase 
  in 
  the 
  size 
  and 
  number 
  of 
  

   the 
  quartzite 
  pebbles 
  it 
  encloses. 
  It 
  may 
  be 
  well 
  seen 
  at 
  Tirumungalum, 
  

   at 
  Kandur, 
  and 
  on 
  the 
  high 
  ground 
  south-west 
  of 
  Arryapaucum. 
  

  

  A 
  small 
  but 
  very 
  easily 
  accessible 
  patch 
  of 
  laterite 
  conglomerate 
  

  

  occurs 
  on 
  the 
  south 
  side 
  of 
  the 
  Cuum 
  immediately 
  

   Near 
  Trivellore 
  station. 
  . 
  . 
  

  

  opposite 
  the 
  Trivellore 
  railway 
  station, 
  and, 
  

   beino- 
  largely 
  quarried 
  as 
  a 
  road 
  material, 
  furnishes 
  many 
  fresh 
  sections. 
  

   The 
  outlying 
  area 
  of 
  laterite 
  lying 
  between 
  Tripassore 
  and 
  the 
  

   Corteliar 
  belongs 
  to 
  the 
  very 
  coarsely 
  conglo- 
  

   meratic 
  variety, 
  the 
  enclosed 
  pebbles 
  and 
  boulders 
  

   being 
  often 
  of 
  large 
  size, 
  as 
  well 
  as 
  extremely 
  numerous. 
  Of 
  the 
  same 
  

   character 
  are 
  the 
  more 
  elevated 
  laterite 
  beds 
  occurring 
  on 
  the 
  small 
  

   table-land 
  lying 
  between 
  the 
  Corteliar 
  and 
  the 
  south-east 
  extremity 
  of 
  

   the 
  Alicoor 
  hills. 
  

  

  The 
  lateritic 
  formations 
  lying 
  on 
  the 
  north 
  and 
  south 
  sides 
  of 
  the 
  

   Nag-o-erv 
  river 
  valley 
  are 
  yet 
  more 
  shingly 
  in 
  

  

  Coarse 
  shingly 
  conglo- 
  °° 
  J 
  

  

  merate. 
  character, 
  but 
  the 
  included 
  shiugles, 
  though 
  large, 
  

  

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  32 
  ) 
  

  

  