﻿JURASSIC 
  ROCKS 
  : 
  SRIPERMATOOR 
  AREA. 
  101 
  

  

  The 
  base 
  of 
  this 
  series 
  cannot 
  be 
  said 
  to 
  be 
  known, 
  as 
  no 
  sections 
  

   occur 
  in 
  which 
  the 
  underlying 
  rocks 
  (most 
  likely 
  the 
  gneiss) 
  are 
  seen 
  

   in 
  contact 
  with 
  the 
  Sripermatoor 
  beds. 
  The 
  probability 
  is, 
  that 
  the 
  

   gritty 
  sandstones 
  are 
  the 
  base, 
  though 
  not 
  seen, 
  resting 
  on 
  the 
  gneiss. 
  

  

  The 
  best 
  section 
  of 
  the 
  series 
  in 
  the 
  northern 
  part 
  of 
  the 
  area 
  occurs 
  

  

  on 
  the 
  flank 
  of 
  a 
  little 
  hillock 
  six 
  miles 
  south 
  of 
  

   Vellakotta 
  section. 
  

  

  Sripermatoor, 
  and 
  half 
  a 
  mile 
  south-west 
  of 
  Vella- 
  

   kotta 
  village, 
  a 
  sketch 
  of 
  which 
  is 
  given 
  in 
  Fig. 
  11 
  and 
  shows 
  the 
  follow- 
  

   ing 
  strata 
  : 
  

  

  Ft. 
  Ft. 
  

  

  1. 
  Laterite 
  conglomerate 
  ... 
  ... 
  ... 
  10 
  to 
  

  

  2. 
  Plant 
  shales 
  ,.. 
  ... 
  ... 
  ... 
  8 
  „ 
  10 
  

  

  3. 
  Friable, 
  gritty 
  sandstone... 
  ... 
  ... 
  10 
  „ 
  12 
  . 
  

  

  4. 
  Gritty 
  shales... 
  ... 
  ... 
  ... 
  2„ 
  3 
  

  

  5. 
  Sandstones 
  (gritty) 
  ... 
  ... 
  ... 
  Base 
  not 
  seen. 
  

  

  Pig. 
  11.— 
  Section 
  of 
  Vellakotta 
  hill. 
  

  

  Another 
  good 
  section 
  is 
  to 
  be 
  seen 
  in 
  the 
  Kambamkal, 
  a 
  channel* 
  

  

  Kambamkal 
  channel 
  ™™% 
  into 
  tne 
  Sripermatoor 
  tank, 
  about 
  half 
  a 
  

   sectlon 
  - 
  mile 
  west 
  of 
  the 
  Department 
  of 
  Public 
  Works 
  

  

  Bungalow 
  at 
  that 
  place. 
  In 
  this 
  sectionf 
  the 
  beds 
  exposed 
  are— 
  

  

  1. 
  Lateritic 
  sand 
  with 
  implements. 
  

  

  2. 
  Plant 
  shales, 
  pure, 
  white, 
  and 
  compact. 
  

  

  3. 
  Coarse 
  yellowish 
  grits, 
  with 
  shaly 
  partings 
  and 
  much 
  false-bedded, 
  very 
  friable. 
  

  

  4. 
  Micaceous 
  sandy 
  shales. 
  

  

  5. 
  White 
  and 
  greenish-grey 
  gritty 
  sandstones, 
  — 
  friable. 
  

  

  * 
  See 
  Fig. 
  3, 
  p. 
  61, 
  which 
  is 
  a 
  diagram 
  sketch 
  of 
  the 
  section 
  in 
  question. 
  

  

  f 
  A 
  very 
  handsome 
  piece 
  of 
  silicified 
  exogenous 
  wood, 
  found 
  when 
  the 
  irrigation 
  

   channel 
  was 
  being 
  dug 
  at 
  Tirumangalum, 
  was 
  presented 
  to 
  the 
  Geological 
  Survey 
  of 
  India 
  

   by 
  the 
  late 
  Mr. 
  C. 
  Maitland 
  of 
  the 
  D. 
  P. 
  W. 
  

  

  ( 
  ioi 
  I 
  

  

  