﻿4 
  • 
  FOOTE 
  : 
  GEOLOGY 
  OF 
  MADRAS. 
  

  

  Of 
  these 
  formations 
  the 
  blown 
  sands 
  and 
  marine 
  alluvium 
  occupy 
  

  

  . 
  the 
  seaboard, 
  and 
  the 
  fluviatile 
  alluvium 
  the 
  vallevs 
  

   Relative 
  positions 
  or 
  

  

  alluvia. 
  f 
  the 
  larger 
  rivers. 
  

  

  The 
  members 
  of 
  the 
  lateritic 
  series 
  occupy 
  the 
  greater 
  part 
  of 
  the 
  

   surface 
  of 
  the 
  higher 
  tracts 
  of 
  land 
  between 
  the 
  

   different 
  alluvial 
  valleys, 
  and 
  lie 
  either 
  on 
  the 
  

   Cuddalore 
  series, 
  or 
  the 
  Rajmahal 
  series, 
  or 
  the 
  metamorphic 
  rocks. 
  

  

  The 
  rocks 
  referred 
  provisionally 
  to 
  the 
  Cuddalore 
  sandstone 
  series 
  

  

  are 
  seen 
  only 
  to 
  a 
  limited 
  extent 
  in 
  a 
  few 
  sections 
  

  

  Cuddalore 
  rocks. 
  , 
  , 
  „ 
  . 
  „ 
  , 
  , 
  

  

  m 
  the 
  northern 
  part 
  ot 
  the 
  area. 
  

  

  The 
  Rajmahal 
  series, 
  generally 
  overlaid 
  and 
  obscured 
  hy 
  the 
  lateritic 
  

  

  formations, 
  occupies 
  a 
  broad 
  belt 
  of 
  country 
  form- 
  

   Raj 
  inahal 
  beds. 
  

  

  ing 
  the 
  central 
  part 
  ot 
  the 
  area. 
  

  

  The 
  metamorphic 
  rocks 
  occupy 
  the 
  area 
  westward 
  of 
  the 
  limits 
  of 
  

  

  the 
  various 
  sedimentary 
  rock-series 
  ; 
  also 
  a 
  consi- 
  

   Metamorphic 
  rocks. 
  

  

  derable 
  tract 
  of 
  country 
  between 
  the 
  coast 
  allu- 
  

   vium 
  and 
  the 
  central 
  sedimentary 
  region 
  from 
  which 
  the 
  sedimentary 
  

   rocks 
  have 
  been 
  removed 
  by 
  denudation. 
  Besides 
  this, 
  there 
  are 
  several 
  

   small 
  inliers 
  of 
  the 
  gneissic 
  rocks 
  which 
  protrude 
  through 
  the 
  sediment- 
  

   ary 
  rock 
  area 
  like 
  so 
  many 
  islands. 
  

  

  These 
  various 
  formations 
  will 
  be 
  considered 
  in 
  the 
  order 
  of 
  their 
  age 
  

   and 
  stratigraphical 
  position, 
  beginning 
  with 
  the 
  uppermost 
  and 
  youngest, 
  

   i. 
  e., 
  those 
  belonging 
  to 
  the 
  recent 
  or 
  quaternary 
  periods. 
  

  

  Before, 
  however, 
  entering 
  upon 
  the 
  description 
  of 
  the 
  several 
  forma- 
  

   tions, 
  it 
  will 
  be 
  well 
  to 
  draw 
  attention 
  to 
  the 
  labours 
  of 
  different 
  geolo- 
  

   gists 
  who 
  had 
  studied 
  the 
  geology 
  of 
  the 
  Madras 
  districts 
  at 
  different 
  

   times 
  before 
  it 
  was 
  systematically 
  worked 
  out 
  by 
  the 
  Geological 
  Survey 
  

   of 
  India. 
  

  

  ( 
  I 
  ) 
  

  

  