﻿61 
  

  

  Chapter 
  VII. 
  — 
  Cretaceous 
  Rocks. 
  

   The 
  presence 
  of 
  any 
  representatives 
  of 
  the 
  cretaceous 
  era 
  within 
  

   the 
  limits 
  of 
  the 
  Madras 
  area 
  has 
  not 
  as 
  yet 
  

   been 
  established, 
  but 
  it 
  is 
  not 
  impossible 
  that 
  

   such 
  may 
  yet 
  be 
  found 
  among 
  the 
  rocks 
  

   of 
  undetermined 
  age 
  underlying 
  the 
  lateritic 
  

   formations 
  to 
  the 
  north-west 
  of 
  Madras. 
  

  

  CD 
  ' 
  

  

  g 
  Certain 
  blocks 
  of 
  gritty 
  sandstone 
  con- 
  

   g 
  taining 
  fossil 
  shells 
  different 
  from 
  the 
  marine 
  

   | 
  fossils 
  of 
  the 
  Rajmahal 
  beds 
  near 
  Sriperma- 
  

   £ 
  toor 
  were 
  found 
  near 
  that 
  place 
  resting 
  

   •„ 
  loosely 
  on 
  the 
  surface 
  of 
  a 
  rather 
  similar 
  

   5 
  gritty 
  bed 
  underlying 
  the 
  plant 
  shales. 
  The 
  

   i- 
  facies 
  of 
  the 
  fossil 
  shells 
  from 
  the 
  grit 
  blocks 
  

   inclines 
  more 
  to 
  that 
  of 
  the 
  cretaceous 
  than 
  

  

  ?< 
  

  

  M 
  

  

  m 
  t 
  of 
  the 
  Jurassic 
  marine 
  fossils, 
  so 
  it 
  may 
  not 
  

   ■£ 
  & 
  be 
  amiss 
  to 
  describe 
  the 
  mode 
  of 
  occurrence 
  

  

  I 
  $ 
  of 
  the 
  blocks 
  in 
  this 
  section 
  of 
  the 
  report. 
  

   °f 
  « 
  The 
  annexed 
  section 
  shows 
  the 
  position 
  

   to 
  "S 
  occupied 
  by 
  these 
  blocks 
  relatively 
  to 
  the 
  

   S 
  underlying 
  Rajmahal 
  beds 
  as 
  exposed 
  in 
  the 
  

   ^ 
  Kambamkal 
  channel 
  (a 
  feeder 
  from 
  the 
  Palar 
  

   | 
  river 
  of 
  the 
  great 
  Sripermatoor 
  tank) 
  , 
  about 
  

   =g 
  half 
  a 
  mile 
  west 
  of 
  the 
  Public 
  Works 
  Depart- 
  

   3 
  ment 
  bungalow. 
  

  

  The 
  section 
  is 
  a 
  very 
  unsatisfactory 
  one, 
  

   the 
  contact 
  of 
  the 
  loose 
  blocks 
  and 
  underly- 
  

   ing 
  grit 
  being 
  obscured 
  by 
  the 
  mud 
  and 
  

   water 
  of 
  the 
  channel 
  in 
  which 
  only 
  they 
  are 
  

   exposed. 
  The 
  blocks 
  found 
  in 
  the 
  banks 
  of 
  

  

  the 
  channel 
  had 
  their 
  upper 
  sides 
  enveloped 
  in 
  the 
  gritty, 
  clayey, 
  

  

  ( 
  61 
  ) 
  

  

  