﻿RIVER 
  ALLUVIA. 
  23 
  

  

  The 
  coarse 
  sandy 
  character 
  of 
  the 
  old 
  Palar 
  alluvium 
  is 
  generally- 
  

   persistent 
  all 
  the 
  way 
  to 
  the 
  junction 
  with 
  that 
  of 
  the 
  Narnaveram 
  river 
  ; 
  

   but 
  where 
  it 
  approaches 
  the 
  edge 
  of 
  the 
  lateritic 
  deposits, 
  or 
  has 
  been 
  

   influenced 
  by 
  small 
  streams 
  rising 
  on 
  the 
  higher 
  lateritic 
  grounds, 
  

   the 
  sand 
  is 
  frequently 
  clayey, 
  e. 
  g., 
  near 
  Metnavilly, 
  &c. 
  Nearly 
  in 
  

   the 
  centre 
  of 
  the 
  valley 
  north-eastward 
  of 
  Trivellore 
  town 
  and 
  along 
  the 
  

   banks 
  of 
  the 
  small 
  stream 
  between 
  Vulloor 
  and 
  Cummacumbade, 
  

   the 
  bare 
  surface 
  consists 
  of 
  very 
  unctuous 
  

  

  Clayey 
  sands, 
  

  

  whitish 
  sandy 
  clay 
  with 
  numerous 
  small 
  

  

  quicksands 
  ; 
  but 
  whether 
  this 
  is 
  the 
  surface 
  of 
  a 
  true 
  clay-bed 
  ; 
  or 
  merely 
  

  

  a 
  local 
  deposit 
  of 
  clayey 
  matter 
  washed 
  up 
  during 
  the 
  inundations 
  of 
  

  

  the 
  stream 
  in 
  question, 
  could 
  not 
  be 
  safely 
  decided, 
  no 
  good 
  sections 
  

  

  being 
  obtainable 
  in 
  that 
  neighbourhood. 
  

  

  The 
  small 
  cliffs 
  forming 
  the 
  banks 
  of 
  the 
  Corteliar 
  river 
  between 
  

  

  Cavilloor 
  and 
  Singacoopum 
  ford 
  show 
  the 
  following 
  section 
  opposite 
  

  

  Kuravayal 
  : 
  — 
  

  

  Ft. 
  Ft. 
  

   Sand 
  ... 
  ... 
  ... 
  ... 
  ... 
  3 
  to 
  4 
  

  

  Dark 
  coloured 
  regur-like 
  clay 
  ... 
  ... 
  ... 
  7 
  to 
  9 
  

  

  Total 
  ... 
  io 
  to 
  13 
  

  

  Further 
  down 
  the 
  river 
  opposite 
  Chooroopaucum 
  and 
  also 
  west 
  

  

  Keddishloam 
  ° 
  f 
  Munarswam 
  y 
  Covil 
  J 
  sm 
  all 
  deposits 
  of 
  dark 
  

  

  reddish 
  brown 
  loam 
  occur 
  in 
  the 
  midst 
  of 
  the 
  

  

  sands 
  and 
  are 
  exposed 
  in 
  the 
  river-side 
  cliffs. 
  Two 
  and 
  a 
  half 
  miles 
  

  

  . 
  „ 
  1A 
  ,. 
  north 
  of 
  the 
  last-named 
  place, 
  considerable 
  infil- 
  

  

  Ferruginous 
  infiltration, 
  ± 
  

  

  trations 
  of 
  ferruginous 
  matter 
  have 
  cemented 
  parts 
  

   of 
  the 
  sands 
  together 
  into 
  not 
  very 
  compact 
  masses 
  bearing 
  a 
  slight 
  resem- 
  

   blance 
  to 
  very 
  sandy 
  laterite. 
  Such 
  material 
  may 
  be 
  seen 
  turned 
  out 
  

   of 
  two 
  or 
  three 
  small 
  tanks 
  recently 
  dug 
  near 
  Mettawhy 
  and 
  Vellary. 
  

   The 
  alluvium 
  of 
  the 
  Narnaveram 
  river 
  is 
  almost 
  

   alluvTuT 
  eram 
  nVer 
  purely 
  sand, 
  occasionally 
  mixed 
  with 
  quartzite 
  peb- 
  

  

  bles, 
  or 
  small 
  boulders 
  derived 
  from 
  the 
  adjoining 
  

  

  ( 
  23 
  ) 
  

  

  