﻿48 
  MEDLICOTT 
  ! 
  SATPtlRA 
  COAL-BASIN. 
  

  

  accumulations 
  of 
  trap 
  "lying 
  against 
  the 
  scarp 
  of 
  the 
  Sitariva 
  hills, 
  

   and 
  in 
  places 
  connected 
  with 
  the 
  rock 
  capping 
  the 
  hills. 
  The 
  fact 
  

   of 
  great 
  disturbance 
  prior 
  to 
  the 
  trappean 
  period 
  is, 
  of 
  course, 
  not 
  

   so 
  conspicuously 
  seen, 
  owing 
  to 
  the 
  very 
  partial 
  nature 
  of 
  the 
  disturb- 
  

   ance 
  ; 
  but 
  there 
  is 
  at 
  least 
  one 
  section 
  placing 
  it 
  beyond 
  doubt. 
  The 
  

   steep 
  anticlinal 
  flexure 
  in 
  the 
  Sitariva 
  section 
  is 
  the 
  most 
  remarkable 
  

   instance 
  of 
  disturbance 
  in 
  the 
  whole 
  sedimentary 
  basin. 
  Close 
  to 
  

   Mohpani 
  at 
  the 
  level 
  of 
  the 
  plains, 
  about 
  a 
  mile 
  west 
  of 
  the 
  river, 
  and 
  

   exactly 
  on 
  the 
  line 
  of 
  contortion, 
  there 
  is 
  a 
  considerable 
  hill, 
  half 
  a 
  

   mile 
  in 
  diameter, 
  of 
  superficial 
  trap. 
  Crushed 
  Talchir 
  beds 
  are 
  seen 
  

   close 
  to 
  its 
  eastern 
  base 
  ; 
  carbonaceous 
  Barakars 
  pass 
  under 
  it 
  on 
  the 
  

   west. 
  The 
  section 
  already 
  described 
  (Fig. 
  4) 
  in 
  the 
  Anhoni 
  region 
  

   gives 
  good 
  evidence 
  to 
  the 
  same 
  effect 
  ; 
  the 
  undisturbed 
  trap-flow 
  at 
  

   the 
  level 
  of 
  the 
  plains 
  abutting 
  against 
  the 
  Talchirs, 
  shows 
  at 
  least 
  the 
  

   pre-trappean 
  denudation 
  of 
  the 
  sedimentary 
  series, 
  and 
  suggests 
  that 
  

   the 
  chief 
  disturbance 
  of 
  the 
  latter 
  must 
  have 
  been 
  of 
  older 
  date. 
  The 
  

   frequent 
  occurrence 
  of 
  trap 
  along 
  lines 
  of 
  local 
  disturbance, 
  as 
  along 
  

   the 
  inner 
  junction 
  on 
  the 
  Anhoni 
  section, 
  and 
  conspicuously 
  in 
  the 
  

   Sitariva 
  region, 
  only 
  shows 
  that 
  the 
  eruptive 
  rock 
  availed 
  itself 
  of 
  pre- 
  

   existing 
  lines 
  of 
  fracture. 
  

  

  The 
  distribution 
  of 
  the 
  trap 
  in 
  the 
  basin 
  is 
  a 
  point 
  of 
  much 
  interest 
  

  

  _.. 
  , 
  ., 
  .. 
  » 
  ,, 
  that 
  cannot 
  be 
  fully 
  discussed 
  till 
  the 
  detailed 
  

  

  Distribution 
  or 
  the 
  •> 
  

  

  tra 
  P- 
  mapping 
  has 
  been 
  completed 
  ; 
  but 
  it 
  is 
  sufficiently 
  

  

  apparent 
  already 
  that 
  there 
  is 
  a 
  marked 
  concentration 
  of 
  dykes 
  near 
  

   the 
  northern 
  boundary. 
  It 
  would 
  seem 
  to 
  be 
  somehow 
  connected 
  with 
  

   the 
  flat 
  synclinal 
  depression 
  that 
  is 
  so 
  general 
  a 
  feature 
  at 
  a 
  short 
  dis- 
  

   tance 
  from 
  the 
  boundary. 
  It 
  is 
  this 
  circumstance 
  that 
  brings 
  such 
  a 
  

   preponderance 
  of 
  trap 
  into 
  the 
  topmost 
  groups. 
  There 
  is 
  a 
  noticeable 
  

   cessation 
  of 
  trappean 
  intrusion 
  in 
  the 
  sandstone 
  east 
  of 
  the 
  Sher 
  

   river, 
  and 
  to 
  as 
  far 
  as 
  beyond 
  the 
  Mahanadi 
  in 
  South 
  Riwa. 
  This 
  may 
  

   possibly 
  be 
  a 
  case 
  of 
  negative 
  evidence, 
  owing 
  to 
  the 
  smallness 
  of 
  the 
  

   ( 
  ISO 
  ) 
  

  

  