﻿JABALPUR 
  GROUP. 
  13 
  

  

  about 
  300 
  yards, 
  it 
  passes 
  out 
  of 
  sight 
  beneath 
  these 
  beds, 
  which 
  

   continue 
  well 
  exposed 
  in 
  the 
  river, 
  the 
  strings 
  of 
  jet-coal 
  appearing 
  at 
  

   several 
  places. 
  The 
  strata 
  form 
  a 
  flat 
  synclinal, 
  and 
  in 
  about 
  half 
  

   a 
  mile 
  the 
  trap 
  rises 
  to 
  the 
  south, 
  being 
  again 
  seen 
  for 
  several 
  hundred 
  

   yards 
  in 
  the 
  bank 
  overlaid 
  by 
  unbroken 
  sandstone 
  ; 
  and 
  from 
  here 
  it 
  

   is 
  certainly 
  traceable 
  into 
  connection 
  with 
  the 
  overlying 
  flows. 
  This 
  

   is 
  one 
  of 
  the 
  many 
  instances 
  that 
  occur, 
  especially 
  in 
  this 
  region 
  of 
  

   sheets 
  of 
  trap 
  intruded 
  horizontally 
  for 
  great 
  distances 
  (considering 
  

   the 
  strange 
  nature 
  of 
  the 
  feature) 
  between 
  layers 
  of 
  the 
  sediment- 
  

   ary 
  rock. 
  In 
  other 
  directions 
  the 
  same 
  trap 
  is 
  traced 
  into 
  strong 
  

   vertical 
  dykes. 
  For 
  some 
  nine 
  miles 
  more 
  along 
  the 
  tortuous 
  course 
  

   of 
  the 
  Machiriva, 
  the 
  trap 
  and 
  the 
  Jabalpiir 
  beds 
  alternate 
  repeatedly, 
  

   with 
  various 
  modes 
  of 
  contact 
  — 
  transverse 
  and 
  parallel 
  intrusion 
  

   and 
  overflow, 
  Where 
  the 
  Jabalpurs 
  are 
  finally 
  covered 
  by 
  the 
  trap, 
  

   at 
  a 
  direct 
  distance 
  of 
  five 
  miles 
  from 
  the 
  boundary, 
  the 
  black 
  shales 
  with 
  

   coaly 
  matter 
  are 
  still 
  at 
  the 
  level 
  of 
  the 
  river 
  ; 
  while 
  on 
  the 
  adjoining 
  

   ridges 
  white 
  shales 
  are 
  freely 
  intercalated 
  with 
  the 
  sandstones. 
  The 
  

   thickness 
  is 
  about 
  five 
  to 
  six 
  hundred 
  feet. 
  The 
  topmost 
  beds 
  are 
  

   locally 
  conglomeritic. 
  "West 
  of 
  the 
  Sher 
  the 
  pretrappean 
  denudation 
  

   of 
  the 
  Jabalpurs 
  was 
  much 
  less 
  than 
  in 
  the 
  country 
  to 
  the 
  east, 
  if 
  one 
  

   may 
  judge 
  by 
  the 
  greater 
  thickness 
  and 
  elevation 
  of 
  the 
  sandstone. 
  

  

  About 
  Bachai, 
  five 
  miles 
  west 
  of 
  the 
  Sher, 
  the 
  Jabalpurs 
  are 
  

   The 
  boundary 
  afc 
  Ba- 
  foun(i 
  for 
  tn 
  e 
  first 
  time 
  in 
  force 
  at 
  the 
  main 
  

   boundary. 
  They 
  here 
  form 
  a 
  cliif 
  some 
  400 
  feet 
  

   high, 
  resting 
  upon 
  metamorphic 
  limestone. 
  The 
  bottom 
  beds 
  are 
  coarse 
  

   earthy 
  conglomerates, 
  the 
  principal 
  debris 
  being 
  of 
  earthy 
  schists. 
  In 
  

   the 
  middle 
  portion 
  there 
  are 
  pale 
  red 
  and 
  white 
  shales 
  : 
  and 
  again 
  at 
  

   top 
  there 
  is 
  a 
  thick 
  mass 
  of 
  earthy 
  sandstone-conglomerate. 
  For 
  some 
  

   five 
  miles 
  to 
  the 
  west 
  the 
  edge 
  of 
  the 
  hills 
  is 
  again 
  low 
  and 
  shelving 
  

   and 
  the 
  bottom 
  beds 
  are 
  but 
  sparingly 
  conglomeritic. 
  Then 
  the 
  high 
  

   scarped 
  form 
  comes 
  in, 
  which 
  lasts 
  up 
  to 
  the 
  valley 
  of 
  the 
  Dudhi. 
  At 
  

  

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