﻿JURASSIC 
  rocks: 
  sripermatoor 
  area. 
  105 
  

  

  The 
  lower 
  parts 
  of 
  the 
  shale 
  bed 
  exposed 
  in 
  a 
  large 
  bowrie 
  near 
  the 
  

  

  centre 
  of 
  the 
  high 
  ground 
  (once 
  the 
  site 
  of 
  a 
  

   Vadugal 
  section. 
  

  

  village 
  called 
  Vadugal) 
  are 
  coarser 
  than 
  the 
  usual 
  

  

  form 
  of 
  the 
  shales, 
  here 
  and 
  there 
  a 
  little 
  gritty, 
  and 
  a 
  good 
  deal 
  mottled 
  

  

  with 
  shades 
  of 
  purple 
  and 
  brown, 
  resulting 
  from 
  iron-stains. 
  These 
  are 
  

  

  remarkably 
  unfossiliferous. 
  The 
  higher 
  lying 
  parts 
  of 
  the 
  bed 
  are 
  both 
  

  

  purer 
  in 
  composition 
  and 
  color 
  ; 
  many 
  layers 
  are 
  

   ' 
  Porcellanic' 
  shales. 
  

  

  almost 
  porcellanic 
  in 
  texture 
  and 
  lustre, 
  and, 
  as 
  at 
  

  

  the 
  north 
  end 
  of 
  Sripermatoor 
  tank, 
  of 
  yellowish-buff 
  color 
  inside, 
  and 
  

  

  have 
  a 
  lesser 
  tendency 
  to 
  break 
  into 
  thin 
  lamina?. 
  Several 
  fine 
  specimens 
  

  

  of 
  Palceozamia 
  were 
  found 
  here. 
  

  

  The 
  shales 
  occurring 
  in 
  the 
  lower 
  grounds 
  are 
  a 
  continuation 
  of 
  the 
  

   beds 
  before 
  described, 
  with 
  the 
  addition, 
  in 
  the 
  northern 
  part 
  of 
  the 
  area 
  

   of 
  a 
  bed 
  of 
  much 
  less 
  indurated 
  shale 
  which 
  overlies 
  the 
  lower 
  shales. 
  

   In 
  some 
  parts 
  of 
  the 
  upper 
  bed 
  the 
  shaley 
  structure 
  is 
  almost 
  lost 
  and 
  

   the 
  shale 
  passes 
  into 
  a 
  crumbly 
  clay. 
  This 
  clay 
  is 
  almost 
  everywhere 
  

   unfossiliferous, 
  and 
  generally 
  of 
  whitish-grey 
  color, 
  with 
  a 
  good 
  deal 
  of 
  

   infiltrated 
  kunkur. 
  

  

  There 
  is 
  no 
  sharp 
  line 
  of 
  distinction 
  between 
  the 
  two 
  formations, 
  

  

  « 
  Tesselated' 
  ferru- 
  tlie 
  snales 
  > 
  as 
  a 
  rule 
  ; 
  becoming 
  less 
  compact 
  upward, 
  

   ginous 
  concretions. 
  At 
  the 
  base 
  f 
  fa 
  e 
  c 
  i 
  ayey 
  ^ 
  however, 
  is 
  frequently 
  

  

  a 
  band 
  of 
  large 
  ferruginous 
  concretions, 
  many 
  of 
  them 
  2 
  to 
  3 
  feet 
  long 
  

   and 
  1 
  to 
  2 
  feet 
  thick 
  and 
  of 
  rudely 
  lenticular 
  form. 
  They 
  generally 
  consist 
  

   of 
  a 
  reddish-brown 
  sandy-clay 
  ironstone, 
  stained 
  black 
  or 
  purple 
  in 
  

   parts 
  and 
  often 
  showing 
  a 
  singular 
  tesselated 
  structure. 
  

  

  No 
  recognizable 
  fossils 
  were 
  found 
  in 
  the 
  clayey 
  shales 
  anywhere, 
  but 
  

  

  ' 
  .. 
  ; 
  „ 
  . 
  several 
  of 
  the 
  concretions 
  occurring 
  in 
  the 
  section 
  

  

  Fossils 
  in 
  ferruginous 
  ° 
  

  

  concretions. 
  j 
  n 
  ^ 
  e 
  f 
  eec 
  [er 
  of 
  the 
  Chumbrumbaucum 
  tank 
  

  

  about 
  half 
  a 
  mile 
  east 
  of 
  Amerumbode, 
  where 
  they 
  are 
  best 
  seen, 
  yielded 
  

   vegetable 
  remains 
  in 
  the 
  shape 
  of 
  fragmentary 
  portions 
  of 
  8ta?igerites. 
  

   o 
  ( 
  105 
  ) 
  

  

  