﻿48 
  E00TE 
  : 
  GEOLOGY 
  OP 
  MADRAS. 
  

  

  a 
  small 
  quartzite 
  implement 
  of 
  nearly 
  oval 
  shape 
  imbedded 
  in 
  the 
  hard 
  

   and 
  undisturbed 
  rock. 
  Only 
  a 
  little 
  of 
  the 
  edge 
  of 
  one 
  side 
  of 
  this 
  

   implement 
  projected 
  over 
  the 
  tolerably 
  level 
  surface 
  of 
  the 
  rock, 
  which 
  

   was 
  so 
  hard 
  that 
  it 
  took 
  me 
  not 
  much 
  less 
  than 
  half 
  an 
  hour 
  to 
  chisel 
  

   it 
  out.* 
  

  

  To 
  return 
  south 
  of 
  the 
  Narnaveram 
  river, 
  there 
  is 
  a 
  rather 
  remark- 
  

  

  ~ 
  ,_ 
  . 
  , 
  . 
  able 
  outlier 
  of 
  f 
  Cuddalore 
  ' 
  grits 
  at 
  Maniakaranei 
  

  

  On 
  Manjakaranei 
  out- 
  ° 
  J 
  

  

  lier 
  - 
  (Manjacarnay 
  of 
  map) 
  capped 
  by 
  laterite 
  con- 
  

  

  glomerate 
  ; 
  here 
  again 
  implements 
  were 
  met 
  with, 
  though 
  not 
  in 
  situ, 
  

   but 
  about 
  one 
  and 
  half 
  mile 
  to 
  the 
  south-east 
  on 
  the 
  greatly 
  weathered 
  

  

  surface 
  of 
  the 
  laterite 
  conglomerate 
  capping 
  the 
  

   On 
  top 
  of 
  the 
  cliffs 
  

   south 
  of 
  the 
  Corteliar 
  grit 
  cliffs 
  overhanging 
  the 
  Corteliar 
  river 
  (see 
  

  

  page 
  42) 
  I 
  found 
  several 
  well 
  made 
  and 
  well 
  

  

  preserved 
  implements 
  lying 
  among 
  quartzite 
  pebbles 
  evidently 
  weathered 
  

  

  out 
  from 
  the 
  mass 
  of 
  the 
  laterite. 
  Several 
  others 
  I 
  found 
  imbedded, 
  

  

  and 
  chiselled 
  them 
  out 
  of 
  parts 
  of 
  the 
  rock, 
  which 
  were 
  hard 
  and 
  

  

  unweathered. 
  

  

  It 
  has 
  been 
  suggested 
  that 
  the 
  implements 
  found 
  here 
  and 
  at 
  other 
  

  

  places 
  had 
  not 
  been 
  deposited 
  originally 
  at 
  the 
  same 
  time 
  as 
  the 
  quartzite 
  

  

  shingle 
  and 
  other 
  pebbles 
  of 
  gneiss 
  and 
  quartz, 
  &c, 
  found 
  in 
  the 
  

  

  ferruginous 
  clay 
  mass 
  of 
  the 
  laterite, 
  but 
  that 
  they 
  had 
  been 
  subse- 
  

  

  quentlv 
  dropped 
  on 
  the 
  surface 
  of 
  the 
  laterite 
  

   Theory 
  that 
  the 
  iinple- 
  J 
  ri 
  

  

  ments 
  are 
  not 
  of 
  same 
  w 
  hen 
  uncompacted, 
  and 
  those 
  found 
  impacted 
  

  

  age 
  as 
  the 
  laterite. 
  

  

  in 
  exposed 
  surfaces 
  of 
  the 
  rock 
  had 
  become 
  so 
  

   impacted 
  by 
  subsequent 
  consolidation 
  of 
  the 
  whole 
  bed, 
  and 
  that 
  those 
  

   found 
  loose 
  on 
  the 
  weathered 
  surface 
  of 
  the 
  rock 
  could 
  not 
  be 
  considered 
  

   as 
  having 
  been 
  weathered 
  out 
  of 
  it, 
  but 
  as 
  merely 
  lying 
  accidentally 
  on 
  

   the 
  surface, 
  and 
  therefore 
  altogether 
  younger 
  than 
  the 
  laterite. 
  

  

  * 
  This 
  implement 
  is 
  figured 
  iu 
  a 
  paper 
  read 
  by 
  me 
  to 
  the 
  International 
  Congress 
  for 
  

   Prehistoric 
  Arclnoology 
  held 
  at 
  Norwich 
  in 
  1868, 
  and 
  published 
  in 
  the 
  volume 
  of 
  their 
  

   Transactions. 
  

  

  ( 
  48 
  ) 
  

  

  