﻿34 
  F00TE 
  : 
  GEOLOGY 
  OF 
  MADRAS. 
  

  

  Alicoor 
  hills 
  and 
  into 
  the 
  valleys 
  opening 
  out 
  of 
  them. 
  In 
  an 
  easterly 
  

   direction, 
  similar 
  shingle 
  re-appears 
  at 
  intervals 
  at 
  Cutchoor 
  (quite 
  as 
  

   coarse 
  as 
  at 
  Benaloor) 
  all 
  along 
  the 
  northern 
  slope 
  of 
  the 
  high 
  ground 
  

   and 
  as 
  far 
  as 
  Vadamadiri 
  (Waramderry 
  of 
  map), 
  where 
  it 
  is 
  well 
  dis- 
  

   played, 
  especially 
  on 
  the 
  north-west 
  side 
  of 
  the 
  great 
  tank. 
  Here 
  numer- 
  

   ous 
  small 
  blocks 
  of 
  laterite 
  occur 
  with 
  the 
  loose 
  quartzite 
  pebbles 
  

   . 
  on 
  the 
  surface. 
  South 
  of 
  the 
  great 
  tank 
  the 
  

  

  Shingle 
  conglomerate 
  ° 
  

  

  near 
  Churnbode. 
  shingly 
  character 
  is 
  exchanged 
  for 
  a 
  more 
  

  

  sandy 
  one, 
  but 
  re-appears 
  on 
  the 
  high 
  ground 
  west 
  of 
  Vingul 
  and 
  

   north 
  of 
  Churnbode 
  and 
  south 
  of 
  Meyyur. 
  The 
  plateau 
  on 
  the 
  top 
  

   of 
  the 
  high 
  ground 
  west 
  of 
  the 
  Churnbode 
  hill 
  is 
  chiefly 
  covered 
  with 
  

   massive, 
  or 
  gravelly, 
  laterite 
  which 
  extends 
  west 
  to 
  the 
  small 
  scarps 
  at 
  

   Cunjalum 
  near 
  Nelway. 
  

  

  Very 
  fine 
  examples 
  of 
  less 
  coarse 
  conglomerate 
  frequently 
  approach 
  - 
  

  

  ,, 
  ing 
  the 
  above 
  in 
  character 
  occur 
  at 
  various 
  places. 
  

   Conglomerates 
  north 
  ° 
  

  

  of 
  the 
  Narnaveram 
  river. 
  rp 
  the 
  north 
  of 
  the 
  Narnaveram 
  river 
  very 
  

  

  od 
  examples 
  are 
  to 
  be 
  seen 
  at 
  Junglepilly, 
  and 
  again 
  about 
  two 
  

  

  miles 
  to 
  the 
  south-eastward 
  near 
  Sinjeagraram 
  

   K 
  -ar 
  Sinjeagraram 
  and 
  

  

  Junglepilly. 
  (Chingeagrin 
  of 
  map). 
  At 
  both 
  these 
  localities 
  

  

  the 
  laterite 
  forms 
  small 
  scarps 
  of 
  some 
  extent, 
  rising 
  abruptly 
  to 
  a 
  

   height 
  of 
  about 
  30 
  feet 
  above 
  the 
  alluvium 
  of 
  the 
  Narnaveram 
  valley. 
  

   The 
  laterite 
  weathers 
  almost 
  black 
  and 
  is 
  very 
  vermicular 
  in 
  parts. 
  To 
  

   the 
  west 
  this 
  typical 
  conglomerate 
  graduates 
  into 
  a 
  coarse 
  shingle 
  of 
  

   quartzite, 
  not 
  consolidated 
  on 
  the 
  surface, 
  but 
  with 
  pellets 
  of 
  laterite 
  

   mixed 
  with 
  the 
  sand 
  lying 
  in 
  the 
  interstices 
  between 
  the 
  quartzite 
  

   pebbles. 
  Whether 
  the 
  shingle 
  is 
  merely 
  the 
  result 
  of 
  the 
  weathering 
  

   out 
  of 
  the 
  cement 
  of 
  a 
  very 
  coarse 
  conglomerate 
  or 
  a 
  true 
  unaltered 
  

   shino-le 
  bed 
  could 
  not 
  be 
  ascertained 
  in 
  the 
  absence 
  of 
  sections. 
  

  

  Fine 
  beds 
  of 
  typical 
  or 
  nearly 
  typical 
  laterite 
  occur 
  to 
  the 
  north- 
  

   east 
  of 
  Junglepilly 
  at 
  various 
  places, 
  e.g., 
  the 
  south 
  

   end 
  of 
  Caradepootoor 
  tank, 
  at 
  Boodoor, 
  south 
  of 
  

  

  ( 
  34 
  ) 
  

  

  