﻿40 
  FOOTE: 
  GEOLOGY 
  OF 
  MADRAS. 
  

  

  That 
  the 
  lateritic 
  formations 
  once 
  extended 
  further 
  west 
  is 
  certain, 
  

  

  for 
  debris 
  of 
  them 
  occurs 
  in 
  various 
  places 
  at 
  a 
  

   Former 
  western 
  exten- 
  

   sion 
  of 
  lateritic 
  forma- 
  considerable 
  distance 
  from 
  the 
  present 
  boundaries. 
  

  

  tions. 
  

  

  For 
  example, 
  numerous 
  pebbles 
  of 
  quartzite 
  with 
  

   some 
  lateritic 
  gravel 
  occur 
  on 
  the 
  gneiss 
  near 
  Paliamungalum 
  to 
  the 
  

   east 
  of 
  Arconum 
  railway 
  junction. 
  On 
  the 
  north 
  side 
  of 
  the 
  Trittany 
  

   river 
  between 
  Permaltoor 
  and 
  Maundoor, 
  traces 
  remain 
  of 
  the 
  lateri- 
  

   tic 
  formations 
  in 
  the 
  shape 
  of 
  quartzite 
  pebbles, 
  and 
  a 
  little 
  laterite 
  

   gravel, 
  among 
  which 
  a 
  very 
  good 
  stone 
  implement 
  was 
  found. 
  

  

  Where 
  the 
  Naggery 
  river 
  leaves 
  its 
  old 
  alluvial 
  bed 
  and 
  turns 
  

  

  to 
  the 
  south-east, 
  a 
  small 
  patch 
  of 
  lateritic 
  gravel 
  

   Traces 
  near 
  Naggery. 
  

  

  occurs 
  on 
  the 
  top 
  of 
  the 
  gneiss. 
  Three 
  or 
  four 
  

  

  good 
  implements 
  were 
  found 
  here. 
  

  

  About 
  a 
  mile 
  south 
  of 
  the 
  village 
  of 
  Gungamoperam, 
  and 
  again 
  

   close 
  to 
  the 
  north 
  end 
  of 
  the 
  great 
  tank 
  at 
  Panoor, 
  small 
  patches 
  of 
  

   lateritic 
  conglomerate 
  have 
  been 
  left 
  after 
  the 
  removal 
  of 
  probably 
  exten- 
  

   sive 
  beds, 
  by 
  erosion 
  during 
  and 
  after 
  the 
  process 
  of 
  elevation, 
  which 
  

   raised 
  the 
  country 
  to 
  its 
  present 
  position. 
  

  

  Similarly, 
  there 
  are 
  indications 
  of 
  the 
  existence 
  of 
  laterite 
  forma- 
  

   tions 
  on 
  the 
  gneiss 
  country 
  near 
  the 
  sea, 
  e. 
  g. 
  } 
  at 
  Tyhoor, 
  where 
  a 
  

   couple 
  of 
  acres 
  are 
  covered 
  with 
  typical 
  laterite, 
  and 
  near 
  Tiruvanjeri 
  

   and 
  Madampakam, 
  a 
  few 
  miles 
  south 
  of 
  Palaveram, 
  where 
  lateritic 
  

   gravel 
  with 
  quartzite 
  fragments 
  is 
  rather 
  common. 
  The 
  laterite 
  near 
  

   Guindy 
  park 
  is 
  gravelly 
  as 
  a 
  rule, 
  and 
  then 
  very 
  pisolitic 
  in 
  character. 
  

   It 
  contains 
  small 
  angular 
  fragments 
  of 
  quartzite 
  of 
  drab 
  color, 
  which 
  

   contrast 
  strongly 
  with 
  the 
  brownish 
  purple 
  of 
  the 
  pisolitic 
  ferruginous 
  

   gravel. 
  

  

  Near 
  Palaveram, 
  west 
  of 
  the 
  Travellers' 
  Bungalow, 
  the 
  laterite 
  

   is 
  less 
  ferruginous 
  than 
  near 
  Guindy, 
  but 
  approaches 
  more 
  to 
  a 
  con- 
  

   glomerate 
  in 
  its 
  character 
  ; 
  it 
  contains 
  a 
  fair 
  number 
  of 
  quartzite 
  pebbles, 
  

  

  ( 
  !•<> 
  ) 
  

  

  