﻿54 
  MEDLICOTT 
  : 
  SATPURA 
  coal-basin. 
  

  

  Satpura 
  basin 
  than 
  elsewhere. 
  From 
  an 
  inspection 
  of 
  the 
  general 
  cross- 
  

   section 
  of 
  this 
  area, 
  seeing- 
  the 
  great 
  difference 
  in 
  age 
  that 
  must 
  be 
  

   introduced 
  between 
  the 
  beds 
  resting 
  upon 
  the 
  Barakar 
  and 
  Talchir 
  

   groups 
  on 
  the 
  south 
  and 
  those 
  overlying 
  them 
  on 
  the 
  north, 
  any 
  geolo- 
  

   gist 
  would 
  expect 
  to 
  find 
  very 
  marked 
  unconformity 
  in 
  the 
  latter 
  position. 
  

   It 
  is, 
  indeed, 
  easily 
  shown 
  (see 
  preceding 
  sections) 
  that 
  the 
  youngest 
  

   groups 
  of 
  the 
  series 
  have 
  fully 
  participated 
  in 
  the 
  disturbance 
  that 
  has 
  

   affected 
  the 
  oldest 
  ; 
  but 
  independently 
  of 
  this 
  it 
  would 
  be 
  asked, 
  — 
  how, 
  

   if 
  the 
  Barakars 
  on 
  the 
  north 
  and 
  the 
  south 
  were 
  strictly 
  contempora- 
  

   neous, 
  can 
  the 
  beds 
  in 
  the 
  former 
  position 
  have 
  been 
  sheltered 
  from 
  

   deep 
  and 
  irregular 
  denudation 
  during 
  the 
  great 
  time 
  it 
  must 
  have 
  taken 
  

   to 
  accumulate 
  the 
  younger 
  groups, 
  before 
  the 
  topmost 
  of 
  these 
  could 
  

   have 
  been 
  laid 
  down 
  on 
  the 
  north 
  side 
  of 
  the 
  basin 
  ? 
  One 
  can 
  only 
  very 
  

   partially 
  fill 
  the 
  gap 
  by 
  supposing 
  the 
  coal-formation 
  to 
  have 
  commenced 
  

   later 
  and 
  to 
  have 
  been 
  more 
  protracted 
  on 
  the 
  north. 
  All 
  this 
  is 
  the 
  more 
  

   surprising, 
  since 
  most 
  of 
  these 
  rocks 
  are 
  of 
  shallow- 
  water, 
  if 
  not 
  in 
  great 
  

   part 
  of 
  sub-aerial 
  origin. 
  Overlap 
  such 
  as 
  that 
  of 
  the 
  Bagra 
  on 
  the 
  

   Denwa 
  beds 
  implies 
  only 
  nominal 
  unconformity, 
  but 
  where 
  one 
  finds 
  the 
  

   Ba°Ta 
  group 
  resting 
  broadly 
  with 
  parallel 
  stratification 
  on 
  the 
  Barakars 
  

   and 
  Talchirs, 
  with 
  nothing 
  to 
  represent 
  the 
  intervening 
  Denwa, 
  

   Pachmari, 
  Bijori, 
  and 
  Motur 
  deposits, 
  great 
  unconformity 
  must 
  be 
  

   implied. 
  This 
  position 
  is 
  so 
  strong 
  that 
  one 
  must, 
  in 
  spite 
  of 
  

   such 
  evidence 
  as 
  we 
  possess, 
  suppose 
  the 
  existence 
  of 
  strongly 
  con- 
  

   trasting 
  stratification 
  in 
  unexposed 
  contact-sections. 
  There 
  is 
  the 
  more 
  

   room 
  for 
  this 
  conjecture 
  here, 
  in 
  that 
  at 
  nearly 
  all 
  the 
  contacts 
  seen 
  the 
  

   rocks 
  are 
  greatly 
  disturbed. 
  In 
  the 
  only 
  instance 
  where 
  this 
  is 
  not 
  the 
  

   case, 
  in 
  the 
  Amadi 
  river 
  section 
  (Fig. 
  3), 
  the 
  Talchirs 
  do 
  show 
  a 
  slightly 
  

   denuded 
  edge 
  of 
  junction 
  with 
  the 
  Bagra 
  beds. 
  This 
  conclusion 
  would, 
  

   of 
  course, 
  render 
  the 
  search 
  for 
  coal 
  along 
  the 
  northern 
  margin 
  of 
  the 
  

   field 
  more 
  precarious 
  ; 
  involving, 
  as 
  it 
  would, 
  the 
  consideration 
  of 
  removal 
  

   by 
  an 
  ancient 
  denudation, 
  of 
  which 
  no 
  forecast 
  would 
  be 
  possible. 
  

   ( 
  186 
  ) 
  

  

  