﻿66 
  FOOTE 
  : 
  GEOLOGY 
  OF 
  MADKAS. 
  

  

  with. 
  The 
  southern 
  part 
  of 
  this 
  (Sripermatoor) 
  area 
  is 
  occupied 
  by 
  a 
  

   series 
  of 
  grits, 
  sandstones 
  and 
  sandy 
  clays 
  whose 
  exact 
  relation 
  to 
  the 
  

   Sripermatoor 
  shales 
  is 
  not 
  quite 
  clear. 
  

  

  The 
  rocks 
  occurring 
  in 
  the 
  small 
  outlying 
  areas 
  lying 
  westward 
  of 
  

   a 
  line 
  drawn 
  from 
  the 
  great 
  Tennary 
  tank 
  to 
  the 
  south-east 
  end 
  of 
  the 
  

   Alicoor 
  hills 
  all 
  apparently 
  belong 
  to 
  the 
  lower 
  part 
  of 
  the 
  Sripermatoor 
  

   group, 
  while 
  those 
  lying 
  eastward 
  of 
  this 
  line, 
  both 
  north 
  and 
  south 
  of 
  

   the 
  Corteliar, 
  seem 
  to 
  be 
  representatives 
  of 
  the 
  Sripermatoor 
  shales 
  or 
  

   other 
  younger 
  members 
  of 
  the 
  series. 
  

  

  (a). 
  — 
  The 
  Sattavedu 
  area. 
  

   This 
  area 
  is 
  limited 
  to 
  the 
  extent 
  of 
  the 
  Sattavedu 
  hills, 
  a 
  series 
  of 
  

   moderately 
  elevated 
  rounded 
  hill 
  ridges 
  lying 
  on 
  the 
  borders 
  of 
  the 
  

   North 
  Arcot 
  and 
  Madras 
  District. 
  The 
  main 
  mass 
  of 
  the 
  hills 
  is 
  made 
  

   up 
  of 
  immense 
  beds 
  of 
  compact 
  conglomerate 
  of 
  extreme 
  coarseness, 
  

   intercalated 
  with 
  a 
  few 
  beds 
  of 
  sandstone 
  and 
  grit. 
  These 
  conglome- 
  

   rate 
  beds 
  were 
  once 
  continuous 
  with 
  those 
  in 
  the 
  Alicoor 
  hills, 
  though 
  

   now 
  separated 
  by 
  the 
  alluvial 
  valley 
  of 
  the 
  Narnaveram 
  river. 
  

  

  The 
  western 
  and 
  northern 
  parts 
  of 
  the 
  Sattavedu 
  area 
  were 
  not 
  

   examined 
  by 
  me, 
  but 
  by 
  Mr. 
  King 
  ; 
  hence 
  I 
  can- 
  

   beds 
  from 
  Sattavedu 
  not 
  speak 
  very 
  decidedly 
  about 
  them 
  ; 
  but 
  I 
  incline 
  

   to 
  think 
  that 
  either 
  the 
  whole 
  of 
  the 
  beds 
  occur- 
  

   ring 
  in 
  the 
  Sattavedu 
  hills 
  belong 
  to 
  the 
  upper 
  or 
  Sattavedu 
  group, 
  

   or 
  else 
  that 
  the 
  beds 
  belonging 
  to 
  the 
  Sripermatoor 
  group, 
  occur 
  only 
  at 
  

   the 
  very 
  base 
  of 
  the 
  series 
  forming 
  the 
  Sattavedu 
  hills. 
  The 
  reason 
  for 
  

   arriving 
  at 
  this 
  conclusion 
  lies 
  in 
  the 
  fact 
  that 
  the 
  continuation 
  of 
  the 
  

   beds 
  occurring 
  on 
  the 
  north-east 
  side 
  of 
  tiie 
  Alicoor 
  hills, 
  (which 
  belong 
  

   unquestionably 
  to 
  the 
  Sattavedu 
  group,) 
  in 
  the 
  directiou 
  of 
  their 
  strike 
  so 
  

   as 
  to 
  join 
  the 
  corresponding 
  beds 
  at 
  the 
  south 
  extremity 
  of 
  the 
  Sattavedu 
  

   hills, 
  leaves 
  no 
  space 
  for 
  the 
  filling 
  in 
  the 
  Sripermatoor 
  group 
  beds 
  of 
  

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