﻿100 
  FOOTE 
  : 
  GEOLOGY 
  OP 
  MADRAS. 
  

  

  of 
  size 
  in 
  a 
  south-east 
  and 
  a 
  south 
  direction 
  of 
  the 
  separate 
  constituent 
  

   parts 
  of 
  all 
  the 
  rocks 
  belonging 
  to 
  the 
  Rajmahal 
  system. 
  

  

  Friable 
  sandstones 
  are 
  exposed 
  in 
  an 
  old 
  ruinous 
  well 
  a 
  few 
  hundred 
  

  

  Naggery 
  Coopum 
  sec- 
  y 
  ards 
  south-east 
  of 
  Naggery 
  Coopum, 
  a 
  hamlet 
  of 
  

  

  recent 
  origin 
  about 
  two 
  and 
  a 
  half 
  miles 
  north 
  of 
  

  

  Tukkolum, 
  to 
  a 
  depth 
  of 
  7 
  to 
  9 
  feet 
  and 
  capped 
  by 
  about 
  4 
  feet 
  of 
  granitic 
  

  

  debris 
  and 
  lateritic 
  quartzite 
  gravel. 
  The 
  sandstone 
  includes 
  layers 
  of 
  

  

  quartzite 
  pebbles 
  and 
  is 
  in 
  part 
  conglomeratic. 
  

  

  (d). 
  — 
  The 
  Sripermatoor 
  area. 
  

  

  Included 
  in 
  this 
  area 
  are 
  the 
  Rajmahal 
  rocks 
  occurring 
  immediately 
  

   around 
  the 
  village 
  of 
  Sripermatoor, 
  and 
  several 
  outlying 
  outcrops 
  of 
  beds 
  

   belonging 
  to 
  the 
  same 
  system, 
  and 
  lying 
  south 
  of 
  the 
  Corteliar 
  river. 
  

  

  The 
  Sripermatoor 
  area 
  itself 
  is 
  occupied 
  by 
  two 
  series 
  of 
  rocks 
  

  

  whose 
  exact 
  relative 
  position 
  is 
  not 
  satisfactorily 
  

   Two 
  series 
  of 
  rocks. 
  .. 
  . 
  

  

  determined, 
  owing 
  to 
  the 
  want 
  ot 
  sections, 
  ot 
  

  

  sufficient 
  magnitude, 
  to 
  show 
  the 
  two 
  series 
  in 
  contact. 
  

  

  One 
  of 
  these 
  two 
  series, 
  which 
  includes 
  the 
  typical 
  plant-shale 
  beds 
  

  

  of 
  Sripermatoor, 
  and 
  some 
  underlying 
  gritty 
  

  

  Their 
  relative 
  positions. 
  . 
  „ 
  . 
  

  

  sandstones, 
  occupies 
  the 
  northern 
  part 
  or 
  the 
  

  

  area, 
  while 
  the 
  southern 
  part 
  is 
  occupied 
  by 
  a 
  series 
  of 
  grey 
  clays, 
  

  

  reddish 
  or 
  purplish 
  gritty 
  sandstones, 
  and 
  buff 
  sandy 
  shales, 
  very 
  unlike 
  

  

  in 
  color 
  to 
  the 
  white 
  shales 
  and 
  grits 
  occurring 
  further 
  north. 
  

  

  The 
  principal 
  outliers, 
  four 
  in 
  number, 
  of 
  the 
  Sripermatoor 
  area, 
  

   occur 
  along 
  the 
  outer 
  edges 
  of 
  the 
  lateritic 
  deposits 
  which 
  lie 
  round 
  the 
  

   north 
  end 
  of 
  the 
  area. 
  

  

  The 
  lithological 
  character 
  of 
  the 
  beds 
  in 
  the 
  northern 
  half 
  of 
  the 
  

  

  area 
  is 
  very 
  uniform 
  throughout 
  the 
  basin-like 
  

   Northern 
  half 
  of 
  area. 
  . 
  . 
  

  

  series 
  ol 
  shallow 
  valleys 
  they 
  occupy. 
  

  

  ( 
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  ) 
  

  

  