﻿RIVER 
  ALLUVIA, 
  ,25 
  

  

  It 
  will 
  be 
  observed 
  on 
  reference 
  to 
  the 
  map, 
  that 
  the 
  Corteliar 
  to 
  

   the 
  north 
  of 
  Tripassore 
  does 
  not 
  continue 
  to 
  flow 
  in 
  the 
  alluvial 
  

   valley 
  of 
  the 
  old 
  Palar, 
  but 
  forces 
  its 
  way 
  between 
  two 
  rather 
  ele- 
  

   vated 
  spreads 
  of 
  lateritic 
  conglomerate 
  near 
  Pundi 
  (Boondy 
  of 
  Atlas 
  

   sheet) 
  . 
  It 
  is 
  uncertain 
  whether 
  this 
  passage 
  was 
  forced 
  by 
  the 
  waters 
  

   of 
  the 
  united 
  Corteliar 
  and 
  Naggery 
  rivers, 
  or 
  whether 
  it 
  had 
  already 
  

   been 
  made 
  by 
  the 
  Old 
  Palar. 
  There 
  is 
  no 
  distinct 
  evidence 
  on 
  the 
  

   subject, 
  but 
  the 
  probability 
  is, 
  the 
  passage 
  was 
  forced 
  by 
  the 
  old 
  Palar 
  

   river 
  after 
  it 
  had 
  silted 
  up 
  its 
  valley 
  in 
  the 
  narrower 
  part 
  lying 
  between 
  

   Trivellore 
  and 
  Nemaly 
  to 
  a 
  height 
  sufficient 
  for 
  its 
  waters 
  to 
  flow 
  into 
  

   what 
  was 
  undoubtedly 
  an 
  old 
  valley 
  formed 
  by 
  denudation 
  during 
  the 
  

   period 
  of 
  elevation 
  which 
  raised 
  the 
  implement-bearing 
  laterite 
  to 
  its 
  

   present 
  position. 
  

  

  The 
  direction 
  in 
  which 
  the 
  Corteliar 
  here 
  flows 
  seems 
  to 
  indicate 
  

   that 
  it 
  was 
  then 
  the 
  more 
  important 
  stream, 
  instead 
  of 
  bringing 
  down 
  

   as 
  at 
  present 
  a 
  much 
  less 
  amount 
  of 
  water 
  than 
  the 
  Naggery 
  river 
  ; 
  

   this 
  points 
  to 
  the 
  inference 
  that 
  the 
  Naggery 
  river 
  at 
  that 
  period 
  still 
  

   flowed 
  into 
  the 
  Narnaveram 
  river, 
  the 
  passage 
  through 
  the 
  narrow 
  gneiss 
  

   ridge 
  three 
  miles 
  north 
  -north-west 
  of 
  Nellatoor 
  mentioned 
  before 
  (page 
  

   21) 
  not 
  having 
  been 
  formed 
  till 
  a 
  later 
  period. 
  

  

  Between 
  Pundi 
  (Boondy) 
  and 
  Villapaucum, 
  the 
  Corteliar 
  has, 
  

   during 
  its 
  floods, 
  deposited 
  a 
  good 
  deal 
  of 
  reddish 
  loam 
  on 
  its 
  banks, 
  

   but 
  as 
  it 
  flows 
  in 
  a 
  rather 
  deep 
  channel, 
  this 
  newer 
  alluvium 
  never 
  attains 
  

   to 
  the 
  same 
  general 
  level 
  as 
  the 
  older, 
  more 
  gritty 
  or 
  sandy 
  and 
  paler 
  

   Palar 
  deposits. 
  

  

  Like 
  the 
  Corteliar, 
  the 
  Narnaveram 
  river 
  flows 
  in 
  a 
  deep 
  bed, 
  

   The 
  Narnaveram 
  river 
  an 
  ^ 
  appears 
  to 
  be 
  far 
  more 
  active 
  in 
  eroding 
  the 
  

   old 
  alluvium 
  than 
  in 
  depositing 
  the 
  material 
  de- 
  

   rived 
  from 
  its 
  higher 
  reaches. 
  

  

  Were 
  it 
  not 
  that 
  great 
  part 
  of 
  the 
  water 
  of 
  all 
  the 
  rivers 
  in 
  this 
  

   part 
  of 
  the 
  Carnatic 
  is 
  drawn 
  off 
  by 
  side 
  channels 
  during 
  freshes, 
  and 
  

   d 
  ( 
  25 
  ) 
  

  

  