﻿42 
  E00TE 
  : 
  GEOLOGY 
  OE 
  MADRAS. 
  

  

  Unfortunately 
  no 
  section 
  I 
  am 
  acquainted 
  with 
  throws 
  much 
  light 
  

  

  on 
  the 
  subject, 
  for 
  in 
  none 
  do 
  the 
  gravels 
  appear 
  

  

  Want 
  of 
  good 
  sections. 
  ^^ 
  expoged 
  in 
  CQntact 
  with 
  the 
  R 
  a 
  j 
  ma 
  hal 
  

  

  beds 
  or 
  with 
  the 
  true 
  laterite 
  ; 
  nor 
  have 
  I 
  found 
  any 
  section 
  showing 
  

  

  the 
  Cuddalore 
  sandstones 
  and 
  Rajmahal 
  beds 
  in 
  contact: 
  — 
  nor 
  have 
  

  

  any 
  fossils 
  yet 
  been 
  found 
  in 
  the 
  Conjeveram 
  

  

  Absence 
  of 
  fossils. 
  gmY&h 
  hj 
  w 
  ^ 
  cli 
  to 
  distmguish 
  them 
  from, 
  or 
  

  

  to 
  assign 
  them 
  unhesitatingly 
  to, 
  either 
  of 
  the 
  two 
  series 
  of 
  rocks. 
  The 
  

   mineral 
  character 
  of 
  the 
  gravels 
  is 
  very 
  uniform 
  on 
  the 
  whole, 
  con- 
  

   sisting 
  mainly 
  of 
  quartzite 
  pebbles 
  of 
  various 
  colors, 
  rarely 
  larger 
  than 
  a 
  

   man's 
  fist; 
  associated 
  with 
  these 
  are 
  pebbles 
  of 
  gneiss, 
  quartz, 
  and 
  

   debris 
  of 
  decomposing 
  granitic 
  rocks 
  of 
  all 
  kinds. 
  

  

  The 
  sandy 
  beds 
  are 
  generally 
  reddish 
  in 
  color, 
  with 
  lateritic 
  pellets 
  

  

  occasionally 
  becoming 
  slightly 
  clayey 
  and 
  moder- 
  

   Sandy 
  beds 
  ; 
  tbe 
  gravel 
  

   series. 
  atelv 
  compact, 
  e. 
  g., 
  near 
  Shevtamodoo 
  and 
  

  

  to 
  the 
  east 
  of 
  Nelliangolam 
  ; 
  both 
  places 
  lying 
  near 
  the 
  banks 
  of 
  

  

  the 
  Palar 
  river. 
  Typical 
  examples 
  of 
  the 
  gravels 
  may 
  be 
  studied 
  on 
  

  

  the 
  sides 
  of 
  the 
  Tennary 
  tank 
  off-flow 
  channel 
  

  

  Sections 
  at 
  

  

  Ingepaucum, 
  north 
  of 
  Devaroyempakkam 
  ; 
  on 
  the 
  rising 
  

  

  grounds 
  north 
  of 
  Great 
  Conjeveram 
  in 
  a 
  very 
  ruinous 
  bowry 
  at 
  Inge- 
  

   paucum 
  three 
  miles 
  north 
  of 
  the 
  town. 
  In 
  the 
  northern 
  madaghoo 
  

  

  (off-flow 
  channel) 
  of 
  the 
  large 
  tank 
  at 
  Corree 
  the 
  

   Corree, 
  

   Vidaloor. 
  white 
  gritty 
  Conjeveram 
  gravels 
  rest 
  conformably 
  

  

  on 
  white 
  friable 
  grits. 
  The 
  white 
  grits 
  of 
  the 
  Vidaloor 
  tank 
  mada- 
  

   ghoo 
  are 
  likewise 
  conformably 
  overlaid 
  by 
  the 
  somewhat 
  lateritic 
  gravels. 
  

   In 
  a 
  section 
  in 
  a 
  new 
  well 
  being 
  dug 
  about 
  one 
  and 
  a 
  half 
  mile 
  east 
  

   by 
  north 
  of 
  the 
  Pagoda 
  at 
  Damul 
  (eight 
  miles 
  west- 
  

   Damul. 
  north-west 
  of 
  Conjeveram) 
  the 
  beds 
  observed 
  were 
  

  

  greyish-red, 
  gritty 
  coarse 
  sand, 
  slightly 
  lateritic, 
  3^ 
  feet 
  in 
  thickness, 
  

   lying 
  on 
  obscurely 
  bedded 
  friable 
  gritty 
  felspar 
  gravel, 
  exposed 
  to 
  about 
  

   10 
  feet 
  in 
  depth. 
  

   ( 
  42 
  ) 
  

  

  