﻿JURASSIC 
  ROCKS 
  : 
  SATTAVEDU 
  AREA. 
  67 
  

  

  the 
  western 
  side 
  of 
  the 
  Alicoor 
  hills. 
  An 
  additional 
  reason 
  for 
  consider- 
  

   ing- 
  all 
  the 
  beds 
  north 
  of 
  the 
  Narnaveram 
  river 
  to 
  belong- 
  to 
  the 
  Satta- 
  

   vedu 
  group 
  is, 
  that 
  even 
  the 
  lowermost 
  conglomerate 
  beds 
  east 
  of 
  

   Nagloperam 
  are 
  compacted 
  together 
  with 
  a 
  hard 
  and 
  generally 
  ferrugi- 
  

   nous 
  cementing 
  material, 
  which 
  is 
  quite 
  unlike 
  the 
  perfectly 
  loose, 
  or 
  very 
  

   slightly 
  compacted, 
  conglomerates 
  of 
  the 
  Sripermatoor 
  group. 
  

  

  The 
  conglomerate 
  beds 
  occurring 
  on 
  the 
  east 
  and 
  south 
  sides 
  of 
  

   the 
  Sattavedu 
  hills 
  were 
  formed 
  by 
  the 
  cementing 
  together 
  of 
  very 
  coarse 
  

   quartzite 
  shingle 
  with 
  a 
  cement 
  generally 
  of 
  great 
  hardness, 
  and 
  either 
  

   ferrugino-argillaceous, 
  or 
  calcareo-silicious, 
  in 
  composition. 
  The 
  rocks 
  

   are 
  very 
  rarely 
  seen 
  in 
  these 
  parts 
  of 
  the 
  hills 
  owing 
  to 
  the 
  immense 
  

   amount 
  of 
  debris 
  caused 
  by 
  the 
  weathering 
  of 
  the 
  conglomerate 
  beds. 
  

  

  In 
  the 
  corresponding 
  beds 
  in 
  the 
  Alicoor 
  hills, 
  rolled 
  fragments 
  of 
  

   granite, 
  syenite, 
  and 
  more 
  rarely 
  of 
  quartz, 
  occur 
  among 
  the 
  included 
  

   shingle, 
  and 
  become 
  more 
  numerous 
  in 
  a 
  southerly 
  direction. 
  

  

  In 
  the 
  south-east 
  part 
  of 
  the 
  Sattavedu 
  hills 
  between 
  Sirgulpilly 
  

   and 
  Sattavedu 
  village 
  none 
  but 
  conglomerate 
  beds 
  were 
  observed, 
  and 
  

   these 
  all 
  showed 
  a 
  dip 
  to 
  the 
  south 
  or 
  south-east. 
  These 
  extremely 
  

   coarse 
  conglomerates, 
  where 
  not 
  weathered, 
  all 
  exhibited 
  a 
  dark, 
  generally 
  

   purplish 
  chocolate-brown, 
  ferruginous 
  matrix, 
  which 
  latter, 
  however, 
  was 
  

   much 
  less 
  in 
  quantity 
  than 
  the 
  included 
  pebbles 
  of 
  quartzite. 
  Not 
  a 
  

   trace 
  of 
  organic 
  remains 
  was 
  found 
  in 
  these 
  coarse 
  formations. 
  

  

  No 
  good 
  sections 
  of 
  these 
  coarse 
  beds 
  occur 
  on 
  the 
  east 
  and 
  south 
  

  

  sides 
  of 
  the 
  hills 
  ; 
  the 
  best 
  is 
  to 
  be 
  met 
  with 
  in 
  the 
  

   Sirgulpilly 
  section. 
  

  

  deep 
  long 
  valley 
  or 
  ravine, 
  north 
  of 
  Sirgulpilly 
  ; 
  

  

  here 
  three 
  great 
  conglomerate 
  beds 
  at 
  least 
  crop 
  out, 
  their 
  strike 
  being 
  

  

  nearly 
  at 
  right 
  angles 
  to 
  the 
  axis 
  of 
  the 
  valley. 
  They 
  appear 
  at 
  some 
  

  

  distance 
  from 
  each 
  other,* 
  and 
  indicate 
  a 
  thickness 
  of 
  beds 
  of 
  several 
  

  

  * 
  The 
  bottom 
  of 
  the 
  ravine 
  is 
  so 
  rugged 
  with 
  small 
  water-courses 
  and 
  brushwood 
  

   that 
  I 
  was 
  unable 
  to 
  pace 
  the 
  distances 
  between 
  the 
  several 
  outcrops, 
  but 
  they 
  are 
  probably 
  

   about 
  100 
  yards 
  apart 
  from 
  each 
  other. 
  

  

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  67 
  ) 
  

  

  