﻿26 
  BOSE 
  : 
  GEOLOGY 
  OF 
  THE 
  LOWER 
  NARBADA 
  VALLEY. 
  

  

  tinuation 
  of 
  that 
  referred 
  to 
  above, 
  1 
  which 
  cuts 
  off 
  the 
  granitoid 
  rocks 
  of 
  

   Ali 
  from 
  the 
  basalts 
  of 
  the 
  Deccan 
  trap 
  system. 
  In 
  the 
  stream 
  west 
  

   of 
  Walpur, 
  which 
  marks 
  the 
  fault 
  line, 
  the 
  strata 
  are 
  highly 
  disturbed, 
  

   dipping 
  south 
  and 
  south-west 
  at 
  angles 
  varying 
  from 
  15 
  to 
  20 
  degrees, 
  

   which 
  I 
  took 
  to 
  be 
  evidence 
  in 
  favour 
  of 
  dislocation. 
  

  

  There 
  is 
  hardly 
  any 
  change 
  in 
  lithology, 
  beyond 
  that 
  much 
  of 
  the 
  

   sandstones 
  by 
  the 
  Hatni 
  is 
  characteristically 
  greyish 
  or 
  dove-coloured 
  ; 
  

   and 
  the 
  succession 
  of 
  beds 
  as 
  exposed 
  on 
  the 
  banks 
  of 
  that 
  river 
  is 
  

   essentially 
  a 
  repetition 
  of 
  that 
  seen 
  on 
  the 
  Wagni, 
  south 
  of 
  Bag. 
  The 
  

   only 
  difference 
  is, 
  that 
  there 
  is 
  an 
  increase 
  in 
  thickness, 
  especially 
  of 
  the 
  

   fine-grained 
  and 
  shaly 
  top 
  beds. 
  Ferruginous, 
  reddish 
  beds, 
  similar 
  to 
  

   those 
  noticed 
  east 
  of 
  Bag, 
  prevail 
  about 
  Bajawat 
  and 
  Sejgaon 
  (between 
  

   Nanpur 
  and 
  Rajpur) 
  ; 
  and 
  false 
  bedding 
  is 
  noticeable 
  everywhere. 
  

  

  At 
  the 
  villages 
  just 
  mentioned 
  a 
  low 
  southern 
  dip 
  is 
  observable, 
  

   and 
  about 
  Delwani 
  and 
  Hathwi 
  a 
  succession 
  of 
  insignificant 
  dislocations 
  

   occur 
  by 
  the 
  Hatni 
  river. 
  The 
  normal 
  dip 
  here 
  averages 
  8°, 
  to 
  S.-15°-E. 
  

   But 
  opposite 
  Hathwi 
  (B.), 
  where 
  the 
  river 
  takes 
  a 
  southern 
  bend, 
  

   great 
  variation 
  is 
  observed 
  in 
  it. 
  Less 
  than 
  200 
  yards 
  east 
  of 
  the 
  junc- 
  

   tion 
  of 
  a 
  streamlet 
  which 
  flows 
  through 
  Delwani 
  and 
  Chhota 
  Hathwi, 
  the 
  

   inclination 
  is 
  suddenly 
  changed 
  to 
  15°, 
  to 
  N.E. 
  This 
  dip 
  is 
  preserved 
  

   only 
  for 
  a 
  few 
  yards 
  down 
  the 
  river, 
  beyond 
  which 
  the 
  beds 
  incline 
  south- 
  

   ward 
  with 
  an 
  intrusive 
  sheet 
  of 
  basalt. 
  It 
  is 
  about 
  3 
  feet 
  thick. 
  It 
  is 
  

   divided 
  into 
  rude 
  columns 
  nearly 
  up 
  to 
  its 
  termination, 
  where 
  it 
  thins 
  

   out 
  into 
  a 
  greenish, 
  soft, 
  earthy 
  rock, 
  abutting 
  against 
  altered 
  sandstones. 
  

   A 
  few 
  yards 
  further 
  south 
  the 
  normal 
  (southern) 
  dip 
  is 
  restored 
  and 
  

   preserved 
  until 
  the 
  sandstones, 
  with 
  the 
  super-imposed 
  members 
  of 
  the 
  

   upper 
  cretaceous 
  series, 
  are 
  bent 
  down 
  and 
  thrown 
  against 
  some 
  basaltic 
  

   beds 
  highly 
  inclined 
  northward, 
  which 
  make 
  up 
  nearly 
  50 
  feet 
  of 
  the 
  

   beautiful 
  section 
  exposed 
  at 
  the 
  spot. 
  The 
  basalts 
  with 
  the 
  covering 
  

   sandstones 
  are 
  then 
  bent 
  southward 
  forming 
  a 
  synclinal 
  fold; 
  and 
  the 
  

   usual 
  dip 
  is 
  observed 
  a 
  few 
  yards 
  further 
  down 
  the 
  river. 
  Columnar 
  

   below 
  and 
  scoriaceous 
  above, 
  they 
  exhibit 
  the 
  usual 
  structure 
  of 
  contem- 
  

  

  1 
  See 
  ante, 
  p. 
  10. 
  

  

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