﻿16 
  BOSE 
  : 
  GEOLOGY 
  OF 
  THE 
  LOWER 
  NARBADA 
  VALLEY. 
  

  

  East 
  and 
  north 
  of 
  Bhaurikhera 
  the 
  boundary 
  line 
  between 
  the 
  Vin- 
  

   dhyans 
  and 
  Bijawars 
  is 
  extremely 
  irregular. 
  The 
  Vindhyans 
  stretch 
  

   away 
  to 
  Satwas 
  and 
  Chandgarh, 
  where 
  older 
  formations 
  are 
  exposed 
  at 
  

   the 
  base. 
  All 
  along 
  the 
  southern 
  boundary 
  the 
  Deccan 
  trap 
  formation 
  

   encroaches 
  largely 
  in 
  the 
  form 
  of 
  bays, 
  and 
  outliers 
  of 
  it 
  are 
  not 
  

   uncommon. 
  

  

  The 
  typical 
  Vindhyans 
  have 
  not 
  been 
  known 
  to 
  extend 
  further 
  west 
  

   than 
  Billora 
  and 
  Aroda 
  (north 
  of 
  Barwai) 
  in 
  the 
  Narbada 
  valley. 
  

   However, 
  65 
  miles 
  due 
  west 
  from 
  the 
  last-named 
  place, 
  in 
  the 
  neigh- 
  

   bourhood 
  of 
  Balwari, 
  as 
  well 
  as 
  near 
  Jobat, 
  25 
  miles 
  further 
  west, 
  two 
  

   patches 
  of 
  horizontally 
  bedded, 
  peculiar 
  reddish-looking 
  jaspery 
  rocks 
  

   traversed 
  by 
  a 
  net- 
  work 
  of 
  thin 
  1 
  veins 
  of 
  quartz 
  occur, 
  which, 
  I 
  am 
  now 
  

   inclined 
  to 
  think, 
  probably 
  represent 
  the 
  Vindhyans. 
  At 
  both 
  the 
  

   places 
  they 
  rest 
  upon 
  the 
  metamorphics 
  and 
  pass 
  under 
  the 
  Deccan 
  

   trap, 
  and 
  are 
  in 
  close 
  proximity 
  to 
  undoubted 
  and 
  unaltered 
  sandstones 
  

   and 
  limestones 
  belonging 
  to 
  the 
  cretaceous 
  system. 
  

  

  Jobat 
  and 
  Balwdri 
  beds. 
  — 
  Mr. 
  Blanford 
  maps 
  the 
  Balwari 
  beds 
  as 
  

   "Bag" 
  (cretaceous), 
  though 
  he 
  does 
  not 
  express 
  any 
  decided 
  opinion 
  

   about 
  their 
  stratigraphical 
  horizon. 
  2 
  As 
  I 
  could 
  not 
  make 
  up 
  my 
  mind 
  

   on 
  the 
  point 
  during 
  the 
  first 
  season 
  (1880-81), 
  I 
  deferred 
  colouring 
  

   them 
  until 
  I 
  had 
  examined 
  the 
  vicinity 
  of 
  Jobat, 
  where 
  similar 
  beds 
  

   were 
  supposed 
  to 
  exist. 
  I 
  examined 
  this 
  ground 
  during 
  the 
  next 
  

   season, 
  and 
  devoted 
  to 
  it 
  more 
  time, 
  perhaps, 
  than 
  its 
  importance 
  

   demanded. 
  The 
  difficulty 
  still 
  remained 
  unsolved. 
  One 
  thing, 
  however, 
  

   was 
  clear. 
  The 
  cretaceous 
  sandstones 
  were 
  distinctly 
  seen 
  to 
  be 
  uncon- 
  

   formable 
  to 
  the 
  "red 
  rock;" 
  so 
  that 
  it 
  must 
  be 
  older. 
  Mr. 
  Blanford 
  

   maps 
  the 
  Jobat 
  patch 
  as 
  Bijawar. 
  But 
  neither 
  it 
  nor 
  any 
  of 
  the 
  asso- 
  

   ciated 
  rocks 
  has 
  any 
  striking 
  resemblance 
  to 
  known 
  Bijawar 
  rocks; 
  

   whereas 
  stratigraphically 
  the 
  contrast 
  between 
  the 
  horizontal 
  ity 
  of 
  the 
  

  

  * 
  At 
  Jobat 
  grey 
  limestones 
  and 
  conglomerates 
  with 
  a 
  calcareous 
  matrix 
  and 
  rounded 
  

   lumps 
  and 
  nodules 
  of 
  quartz, 
  as 
  well 
  as 
  brownish, 
  apparently 
  baked 
  shales, 
  are 
  associated 
  with 
  

   the 
  " 
  red 
  rock." 
  

  

  2 
  « 
  Memoirs," 
  Vol. 
  VI, 
  pt. 
  3, 
  pp. 
  136, 
  153. 
  

  

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  16 
  ) 
  

  

  