﻿PRELIMINARY 
  NOTICE. 
  3 
  

  

  internal 
  regularity 
  existing- 
  in 
  a 
  basin 
  of 
  this 
  description, 
  gives, 
  of 
  course, 
  

   a 
  strong 
  presumption 
  when 
  counting 
  upon 
  the 
  permanence 
  of 
  any 
  par- 
  

   ticular 
  bed, 
  such 
  as 
  a 
  coal-seam, 
  and 
  makes 
  it 
  possible 
  to 
  estimate 
  with 
  

   some 
  accuracy 
  its 
  position 
  at 
  any 
  part 
  of 
  the 
  basin. 
  The 
  general 
  geo- 
  

   logical 
  knowledge 
  of 
  a 
  formation 
  should, 
  on 
  the 
  other 
  hand, 
  be 
  propor- 
  

   tionate 
  to 
  the 
  preservation 
  and 
  completeness 
  in 
  which 
  its 
  original 
  basin 
  of 
  

   deposition 
  is 
  found. 
  The 
  fact 
  I 
  would 
  express 
  for 
  practical 
  men, 
  in 
  connec- 
  

   tion 
  with 
  Indian 
  coal-fields, 
  is, 
  that 
  a 
  portion 
  of 
  a 
  once 
  very 
  extensive 
  for- 
  

   mation 
  now 
  isolated 
  in 
  a 
  basin 
  of 
  flexure, 
  as 
  is 
  the 
  case 
  with 
  many 
  coal- 
  

   fields, 
  might 
  exhibit 
  a 
  regularity 
  that 
  could 
  not 
  prevail 
  in 
  any 
  consi- 
  

   derable 
  basin 
  of 
  deposition 
  as 
  a 
  whole, 
  in 
  which 
  the 
  effects 
  of 
  all 
  the 
  

   local 
  influences 
  must 
  be 
  exhibited, 
  as 
  is 
  usual 
  in 
  Indian 
  coal-basins. 
  

   There 
  are 
  thus 
  two 
  kinds 
  of 
  evidence 
  from 
  which 
  to 
  infer 
  to 
  what 
  extent 
  

   any 
  particular 
  field 
  is 
  a 
  basin 
  of 
  deposition 
  or 
  a 
  basin 
  formed 
  by 
  

   subsequent 
  crust-movements, 
  viz., 
  (a) 
  the 
  distribution 
  of 
  the 
  groups 
  

   severally 
  and 
  collectively 
  within 
  the 
  field, 
  and 
  (b) 
  the 
  features 
  of 
  the 
  

   boundary. 
  

  

  From 
  both 
  these 
  points 
  of 
  view, 
  it 
  would 
  appear 
  that 
  the 
  Satpura 
  

  

  The 
  Satpura 
  basin 
  is 
  coal-basin 
  is 
  a 
  true 
  basin 
  of 
  deposition 
  ; 
  the 
  present 
  

  

  one 
  of 
  deposition. 
  i 
  -, 
  ,. 
  c,i 
  , 
  . 
  ,, 
  

  

  boundaries 
  representing, 
  tor 
  the 
  strata 
  m 
  contact 
  

  

  there, 
  the 
  original 
  limits 
  of 
  the 
  deposits. 
  There 
  must, 
  no 
  doubt, 
  have 
  

  

  been 
  an 
  overlapping 
  extension 
  of 
  the 
  upper 
  groups 
  beyond 
  the 
  present 
  

  

  low-cut 
  outcrop 
  of 
  the 
  junction 
  ; 
  but 
  the 
  actual 
  plane 
  of 
  junction 
  is 
  not 
  

  

  either 
  a 
  fault, 
  or 
  a 
  floor 
  of 
  deposition, 
  but 
  an 
  edge 
  of 
  deposition. 
  The 
  

  

  general 
  straightness 
  of 
  the 
  northern 
  boundary 
  might 
  suggest 
  a 
  fault 
  ; 
  

  

  but 
  in 
  detail 
  its 
  outline 
  is 
  often 
  sharply 
  curved 
  and 
  serrated. 
  At 
  scores 
  

  

  of 
  places, 
  as 
  at 
  Jabalpur, 
  the 
  strata 
  are 
  seen 
  stretching 
  at 
  the 
  same 
  

  

  horizon 
  into 
  little 
  bays 
  and 
  over 
  barriers 
  of 
  the 
  boundary 
  rocks. 
  There 
  

  

  are 
  also 
  some 
  local 
  sections 
  of 
  the 
  contact, 
  as 
  notably 
  in 
  the 
  Sher 
  and 
  

  

  the 
  Tawa, 
  where 
  the 
  features 
  might 
  suggest 
  faulting; 
  and 
  there 
  may 
  

  

  have 
  been 
  some 
  local 
  slipping 
  along 
  such 
  steep 
  surfaces 
  of 
  contact 
  ; 
  but 
  

  

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