﻿JURASSIC 
  ROCKS 
  : 
  ALICOOR 
  AREA. 
  

  

  75 
  

  

  When 
  viewed 
  from 
  the 
  top 
  of 
  the 
  highest 
  ridge, 
  the 
  outcrops 
  of 
  

   these 
  conglomerate 
  beds 
  are 
  seen 
  distinctly 
  striking 
  north 
  by 
  east 
  to 
  

   north-north-east, 
  and, 
  if 
  continued 
  across 
  the 
  Narnaveram 
  river^ 
  would 
  

   join 
  the 
  most 
  south-westerly 
  conglomerate 
  beds 
  of 
  the 
  Sattavedu 
  hills. 
  

  

  In 
  the 
  lofty 
  cliff 
  opposite 
  the 
  cave 
  two 
  small 
  lenticular 
  masses 
  of 
  

   sandstone 
  are 
  exposed 
  ; 
  they 
  appear 
  to 
  be 
  3 
  or 
  4 
  feet 
  thick, 
  but 
  are 
  

   inaccessible. 
  

  

  About 
  one 
  and 
  a 
  half 
  or 
  two 
  miles 
  north 
  of 
  Alicoor 
  the 
  only 
  other 
  

   bed 
  of 
  sandstone 
  in 
  the 
  Alicoor 
  hills 
  belonging 
  to 
  this 
  series 
  was 
  ob- 
  

   served. 
  The 
  bed 
  is 
  exposed 
  in 
  a 
  small 
  pit 
  on 
  the 
  west 
  side 
  of 
  the 
  

   valley 
  about 
  200 
  feet 
  over 
  the 
  valley, 
  and 
  is 
  quarried 
  for 
  building 
  stone, 
  

   which 
  it 
  yields 
  of 
  a 
  fair 
  quality. 
  The 
  sandstone 
  is 
  fine 
  grained 
  and 
  

   compact, 
  white 
  with 
  concretionary 
  purple 
  bands, 
  precisely 
  like 
  one 
  of 
  

   the 
  sandstones 
  exposed 
  in 
  the 
  quarries 
  in 
  the 
  spur 
  of 
  the 
  Sattavedu 
  

   hills 
  before 
  described 
  (p. 
  71). 
  This 
  sandstone 
  rests 
  on 
  a 
  coarse 
  

   conglomerate 
  containing 
  a 
  considerably 
  larger 
  quantity 
  of 
  granite 
  and 
  

   syenite 
  shingle 
  in 
  addition 
  to 
  the 
  quartzite-shingle, 
  than 
  is 
  the 
  case 
  in 
  

   the 
  other 
  conglomerate 
  beds 
  lying 
  further 
  north. 
  The 
  dip 
  of 
  the 
  beds 
  

   at 
  this 
  place 
  is 
  diminishing 
  as 
  they 
  trend 
  round 
  to 
  the 
  south-west, 
  the 
  

   dip 
  here 
  being 
  about 
  5° 
  south-east, 
  while 
  a 
  couple 
  of 
  hundred 
  yards 
  

   north 
  , 
  the 
  same 
  beds 
  have 
  a 
  dip 
  of 
  12° 
  south-east, 
  and 
  about 
  one-half 
  

   of 
  a 
  mile 
  north, 
  the 
  dip 
  is 
  from 
  25° 
  to 
  39° 
  east-south-easi. 
  

  

  The 
  cementing 
  material 
  in 
  the 
  different 
  conglomerate 
  beds 
  varies 
  

   Varieties 
  of 
  cement- 
  a 
  £ 
  00( 
  * 
  dea 
  ^ 
  * 
  n 
  different 
  parts 
  of 
  one 
  and 
  the 
  same 
  

   mg 
  material. 
  bed 
  j 
  it 
  is 
  sometimes 
  ferrugino-silicious 
  like 
  later- 
  

  

  ite, 
  at 
  other 
  places 
  it 
  is 
  calcareous 
  ; 
  at 
  others 
  again 
  calcareo-silicious, 
  or 
  

   simply 
  arenaceous, 
  the 
  two 
  latter 
  varieties 
  being 
  perhaps 
  the 
  most 
  

   common 
  on 
  the 
  Alicoor 
  hills. 
  

  

  The 
  junction 
  of 
  the 
  Sattavedu 
  group 
  and 
  Sripermatoor 
  group 
  is 
  

   unfortunately 
  nowhere 
  exposed 
  owing 
  to 
  the 
  prodigious 
  accumulations 
  

   of 
  conglomerate 
  debris 
  lying 
  on 
  the 
  hill 
  side, 
  and 
  covering 
  the 
  valleys 
  

   to 
  a 
  considerable 
  depth. 
  

  

  ( 
  ™ 
  ) 
  

  

  