﻿1(jG 
  foote: 
  geology 
  of 
  madhas. 
  

  

  A 
  well 
  preserved 
  impression 
  of 
  a 
  small 
  Ammonite 
  was 
  also 
  picked 
  up 
  

   there. 
  The 
  impression 
  is 
  in 
  a 
  piece 
  of 
  clayey 
  ironstone 
  undistinguishable 
  

   from 
  the 
  more 
  ferruginous 
  parts 
  of 
  some 
  of 
  the 
  concretions. 
  

  

  Fragments 
  of 
  fossil 
  wood 
  were 
  also 
  found 
  in 
  the 
  upper 
  shales 
  in 
  the 
  

   Amerumbode* 
  section, 
  and 
  it 
  seems 
  not 
  unlikely 
  that 
  this 
  clayey 
  shale 
  

   bed 
  is 
  the 
  source 
  whence 
  were 
  derived 
  fragments 
  of 
  silicified 
  exogenous 
  

   wood 
  found 
  scattered 
  on 
  the 
  surface 
  in 
  various 
  places, 
  e. 
  g., 
  at 
  Valerre 
  

   to 
  the 
  west, 
  and 
  on 
  the 
  high 
  ground 
  between 
  Irunkatti 
  Kotta 
  and 
  

   Vollaveram 
  to 
  the 
  north. 
  

  

  The 
  upper 
  part 
  of 
  the 
  lower 
  shales 
  exposed 
  in 
  the 
  large 
  nullah 
  at 
  

   Amerumbode 
  and 
  all 
  along 
  its 
  banks 
  at 
  intervals, 
  from 
  close 
  to 
  Sriper- 
  

   matoor 
  on 
  the 
  west 
  to 
  half 
  a 
  mile 
  from 
  the 
  south 
  end 
  of 
  Sembarram- 
  

   pakkamf 
  tank 
  on 
  the 
  east, 
  are 
  more 
  earthy 
  and 
  less 
  compact 
  than 
  those 
  

   in 
  the 
  localities 
  already 
  described, 
  and 
  also 
  than 
  those 
  in 
  the 
  remaining 
  

   parts 
  of 
  the 
  area. 
  

  

  Porcellanic 
  shales 
  like 
  those 
  found 
  north 
  of 
  Vellum 
  appear 
  in 
  the 
  

  

  „ 
  . 
  , 
  , 
  bottom 
  of 
  the 
  tank 
  at 
  Vellarei 
  (three 
  and 
  a 
  half 
  

  

  Porcellanic 
  shales 
  near 
  

  

  Vellarei. 
  miles 
  south-west 
  by. 
  south 
  of 
  Amerumbode), 
  and 
  

  

  in 
  the 
  tank 
  bottom 
  at 
  Nallur 
  (1| 
  miles 
  east-south-east 
  of 
  Amerumbode), 
  

   and 
  again 
  at 
  the 
  extreme 
  north-east 
  end 
  of 
  the 
  Sripermatoor 
  area 
  near 
  

   Puduperu. 
  In 
  these 
  places, 
  as 
  to 
  the 
  north 
  of 
  Vellum, 
  the 
  porcellanic 
  

   character 
  is 
  accompanied 
  by 
  a 
  peculiar 
  system 
  of 
  jointing, 
  forming- 
  

   wedge-shaped, 
  triangular, 
  or 
  oblong 
  figures. 
  The 
  color 
  also 
  is 
  generally 
  

   a 
  pale-buff, 
  or 
  brownish-yellow; 
  and 
  fossils 
  are 
  here 
  very 
  much 
  more 
  

   abundant 
  than 
  further 
  west. 
  

  

  The 
  organic 
  remains 
  in 
  the 
  shales 
  are 
  very 
  unequally 
  distributed, 
  

  

  „. 
  L 
  ., 
  ,. 
  „ 
  those 
  occurring 
  at 
  the 
  south 
  and 
  north 
  ends 
  of 
  the 
  

  

  Distribution 
  or 
  organic 
  ° 
  

  

  remains. 
  Sripermatoor 
  tank 
  containing 
  hardly 
  any 
  animal 
  

  

  remains, 
  but 
  fragments 
  of 
  plants 
  in 
  fair 
  quantity 
  (see 
  pages 
  122-124). 
  

  

  * 
  Amanimibaid 
  of 
  sheet 
  78. 
  

   f 
  Chumbrumbaucum 
  of 
  map. 
  

  

  ( 
  106 
  ) 
  

  

  