﻿82 
  FOOTE 
  : 
  GEOLOGY 
  OF 
  MADRAS. 
  

  

  the 
  south-west 
  corner 
  of 
  the 
  Naikenpolliam 
  ridge, 
  and 
  about 
  three 
  quarters 
  

   of 
  a 
  mile 
  south-^outh-west 
  of 
  the 
  Trigonometrical 
  Station 
  shown 
  in 
  the 
  

   map. 
  The 
  section, 
  which 
  lies 
  about 
  a 
  mile 
  north-west 
  of 
  Naikenpolliam, 
  is 
  

   seen 
  in 
  a 
  lajge 
  and 
  deep 
  rain-gully 
  forming 
  the 
  head 
  of 
  a 
  small 
  stream 
  

   flowing 
  w-st 
  into 
  the 
  Naggery 
  river. 
  

  

  Tie 
  succession 
  of 
  beds 
  seen 
  here 
  in 
  a 
  section 
  of 
  between 
  25 
  and 
  

   30 
  fert 
  in 
  vertical 
  height 
  is 
  the 
  following 
  :— 
  

  

  Fig. 
  7.— 
  Sketch 
  Section 
  near 
  Naiketipolliam. 
  

  

  1. 
  Debris 
  1 
  ft. 
  to 
  2 
  ft. 
  (very 
  unusually 
  thin). 
  

  

  2. 
  Lateritic 
  gravel 
  5 
  ft. 
  to 
  7 
  ft. 
  

  

  3. 
  Pebbly 
  sandstones 
  (friable). 
  

  

  4. 
  Shaly 
  sandstones 
  with 
  thin 
  layers 
  of 
  clay 
  and 
  clayey 
  grits. 
  

  

  5. 
  Friable 
  sandstones, 
  buff 
  and 
  drab 
  colored, 
  with 
  very 
  regular 
  layers 
  of 
  

  

  6. 
  Clayey 
  grits 
  (buff 
  and 
  drab) 
  with 
  layers 
  of 
  shingle, 
  less 
  regular 
  than 
  

   those 
  in 
  No. 
  5. 
  

  

  A 
  side 
  gully 
  about 
  20 
  or 
  25 
  feet 
  lower 
  down 
  the 
  slope 
  shows 
  10 
  or 
  12 
  

   feet 
  of 
  very 
  coarse 
  clayey 
  grit, 
  much 
  stained 
  by 
  iron 
  infiltrated 
  from 
  the 
  

   overlying 
  laterite. 
  Enclosed 
  in. 
  the 
  clayey 
  grit 
  is 
  much 
  coarse 
  quartzite 
  

   shingle 
  ; 
  all 
  the 
  pebbles 
  also 
  seen 
  in 
  the 
  overlying 
  beds 
  were 
  of 
  quartzite. 
  

   The 
  dip 
  of 
  these 
  beds 
  is 
  apparently 
  between 
  north 
  by 
  east 
  and 
  north- 
  

   east, 
  the 
  inclination 
  to 
  the 
  horizon 
  being 
  less 
  than 
  30°. 
  

  

  No 
  fossils 
  were 
  obtained 
  from 
  any 
  of 
  these 
  beds 
  on 
  being 
  hurriedly 
  

   inspected 
  in 
  1864, 
  but 
  on 
  revisiting 
  them 
  in 
  1865 
  and 
  examining 
  them 
  

   very 
  carefully, 
  a 
  considerable 
  number 
  of 
  specimens 
  of 
  fossil 
  plant 
  remains 
  

   Avas 
  obtained 
  from 
  bed 
  No. 
  4. 
  All 
  the 
  plant 
  remains 
  were 
  fragmentary, 
  

   like 
  those 
  obtained 
  near 
  Sripermatoor, 
  and 
  belonged 
  to 
  four 
  or 
  five 
  

   genera, 
  viz., 
  Tamiopteris, 
  Dictyopteris, 
  Palaozamia, 
  and 
  Pterophgllum, 
  

  

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  82 
  ) 
  

  

  