﻿64 
  POOTE 
  : 
  GEOLOGY 
  OF 
  MADRAS. 
  

  

  the 
  banks 
  of 
  the 
  Narnaveram 
  river 
  (roughly 
  speaking). 
  If 
  the 
  boundary 
  

   be 
  continued 
  thence 
  to 
  Poondamallee, 
  and 
  across 
  the 
  Apoor 
  hill 
  to 
  the 
  

   bank 
  of 
  the 
  Palar, 
  it 
  would 
  enclose 
  all 
  the 
  localities 
  where 
  the 
  Rajmahal 
  

   rocks 
  are 
  known 
  to 
  appear, 
  with 
  the 
  exception 
  of 
  one 
  or 
  two 
  doubtful 
  

   spots, 
  which 
  will 
  be 
  hereafter 
  alluded 
  to 
  separately. 
  The 
  area 
  thus 
  

   described 
  includes 
  nearly 
  (if 
  not 
  more 
  than) 
  1,000 
  square 
  miles, 
  but 
  it 
  

   is 
  only 
  over 
  a 
  small 
  part 
  of 
  this 
  that 
  the 
  Jurassic 
  beds 
  are 
  to 
  be 
  found 
  

   exposed, 
  for, 
  as 
  a 
  glance 
  at 
  the 
  map 
  will 
  show, 
  several 
  hundred 
  square 
  

   miles 
  of 
  the 
  area 
  is 
  covered 
  up 
  by 
  younger 
  formations. 
  

  

  By 
  these 
  superimposed 
  formations 
  the 
  Rajmahal 
  rocks 
  are 
  superficially 
  

   divided 
  into 
  numerous 
  areas, 
  the 
  four 
  largest 
  of 
  which 
  are 
  the 
  Sattavedu 
  

   hills 
  area, 
  the 
  Alicoor 
  hills 
  area, 
  the 
  Pyanoor 
  area, 
  and 
  the 
  Sripermatoor 
  

   area, 
  each 
  of 
  which 
  includes 
  several 
  small 
  and' 
  closely 
  adjacent 
  outliers. 
  

  

  Owing 
  to 
  the 
  entire 
  absence 
  of 
  really 
  good 
  sections, 
  the 
  exact 
  

   stratigraphical 
  relations 
  of 
  the 
  several 
  detached 
  patches 
  can 
  only 
  be 
  

   regarded 
  as 
  approximately 
  ascertained. 
  No 
  real 
  and 
  natural 
  division 
  has 
  

   been 
  found 
  to 
  exist 
  among 
  the 
  members 
  of 
  this 
  series 
  except 
  in 
  litho- 
  

   logical 
  characters, 
  and 
  even 
  these 
  furnish 
  a 
  division 
  into 
  two 
  groups, 
  

   which 
  is 
  only 
  partly 
  true, 
  and 
  which 
  is 
  adopted 
  only 
  provisionally 
  for 
  

   greater 
  convenience 
  in 
  describing 
  the 
  whole 
  series. 
  

  

  The 
  division 
  of 
  the 
  series 
  into 
  two 
  groups 
  which 
  is 
  now 
  proposed 
  is 
  

  

  Series 
  divided 
  into 
  two 
  fairl 
  y 
  suited 
  to 
  the 
  geographical 
  positions 
  and 
  

  

  groups# 
  topographical 
  features 
  of 
  the 
  several 
  distinct 
  areas 
  

  

  formed 
  by 
  these 
  rocks, 
  as 
  will 
  be 
  shown 
  in 
  the 
  sequel. 
  The 
  first 
  of 
  

  

  the 
  two 
  groups 
  consists 
  of 
  the 
  upper 
  members 
  of 
  the 
  series 
  which 
  are 
  

  

  best 
  represented 
  in 
  the 
  Sattavedu 
  hills, 
  where 
  also 
  

  

  Sattavedu 
  group. 
  

  

  they 
  were 
  first 
  studied 
  by 
  Mr. 
  King, 
  of 
  the 
  Geo- 
  

   logical 
  Survey 
  of 
  India, 
  who 
  first 
  proposed 
  to 
  call 
  the 
  great 
  conglo- 
  

   merates 
  occurring 
  so 
  largely 
  in 
  that 
  quarter 
  the 
  ' 
  Sattavedu 
  conglo- 
  

   merates/ 
  

  

  ( 
  64 
  ) 
  

  

  