﻿42 
  MEDLICOTT: 
  SATPIJRA 
  COAL-BASIN. 
  

  

  separate 
  a 
  connection- 
  of 
  the 
  trap 
  with 
  a 
  disturbance 
  of 
  the 
  rock 
  in 
  

   contact. 
  In 
  several 
  streams 
  here 
  the 
  contact 
  is 
  pretty 
  well 
  seen 
  : 
  the 
  

   plane 
  of 
  junction 
  is 
  always 
  steep, 
  sometimes 
  even 
  overhanging; 
  and 
  the 
  

   trap 
  in 
  contact 
  being 
  massive 
  and 
  dense, 
  the 
  feature 
  has 
  the 
  appearance 
  

   of 
  a 
  strong 
  dyke 
  along 
  the 
  boundary. 
  But 
  this 
  may 
  be 
  deceptive 
  ; 
  it 
  

   may 
  only 
  be 
  an 
  accumulation 
  of 
  hard 
  trap 
  against 
  a 
  steep 
  edge 
  of 
  the 
  

   clays. 
  At 
  all 
  events, 
  this 
  massive 
  rock 
  is 
  continuous 
  down 
  stream 
  with 
  

   well-bedded 
  volcanic 
  rocks 
  of 
  various 
  textures, 
  compact, 
  vesicular 
  and 
  

   earthy, 
  all 
  having 
  a 
  very 
  gentle 
  northerly 
  slope, 
  and 
  capped 
  by 
  a 
  bed 
  of 
  

   rock-laterite 
  at 
  Grhugri, 
  two 
  miles 
  from 
  the 
  boundary. 
  This 
  section 
  is 
  

   itself 
  sufficient 
  proof 
  of 
  the 
  fact 
  just 
  stated 
  — 
  that 
  the 
  trap 
  is 
  subsequent 
  

   to 
  the 
  denudation 
  of 
  the 
  coal-series, 
  when 
  even 
  the 
  Narbada 
  valley 
  was 
  

   lower 
  than 
  it 
  is 
  now 
  ; 
  but 
  the 
  question 
  before 
  us 
  is, 
  the 
  relation 
  of 
  the 
  

   actual 
  boundary 
  to 
  an 
  original 
  limit 
  of 
  deposition 
  or 
  to 
  one 
  induced 
  by 
  

   general 
  faulting. 
  Whatever 
  may 
  be 
  the 
  case 
  elsewhere, 
  it 
  would 
  seem 
  

   that 
  the 
  boundary 
  here 
  was 
  determined 
  by 
  pre-trappean 
  denudation 
  ; 
  

   and 
  that 
  the 
  crashing 
  along 
  it 
  was 
  induced 
  by 
  the 
  trap 
  either 
  at 
  the 
  

   time 
  of 
  its 
  eruption, 
  or, 
  as 
  is 
  more 
  likely, 
  by 
  some 
  subsequent 
  compres- 
  

   sion, 
  when 
  this 
  whole 
  country 
  was 
  overlaid 
  by 
  many 
  hundred 
  feet 
  of 
  the 
  

   eruptive 
  rock. 
  To 
  attribute 
  the 
  present 
  crushing 
  in 
  the 
  Talchir 
  clays 
  

   along 
  this 
  line 
  to 
  action 
  at 
  a 
  former 
  primitive 
  boundary 
  with 
  metamor- 
  

   phics 
  would 
  be 
  very 
  far-fetched 
  and 
  untenable 
  ; 
  and 
  equally 
  so, 
  and 
  for 
  

   the 
  same 
  reason, 
  to 
  connect 
  it 
  with 
  a 
  pre-trappean 
  faulting. 
  Against 
  

   this 
  latter 
  supposition 
  there 
  is 
  the 
  additional 
  objection 
  of 
  abrupt 
  irregu- 
  

   larity 
  of 
  direction 
  — 
  the 
  contact 
  in 
  the 
  next 
  stream, 
  a 
  short 
  distance 
  to 
  

   east 
  of 
  the 
  Kukurkhodi, 
  is 
  a 
  mile 
  more 
  to 
  the 
  north 
  ; 
  and 
  the 
  northern 
  

   promontory 
  of 
  Devi 
  hill 
  is 
  again 
  considerably 
  in 
  advance 
  of 
  this. 
  

  

  To 
  the 
  west 
  of 
  the 
  Anhoni 
  bay, 
  the 
  metamorphics 
  are 
  again 
  in 
  force. 
  

  

  West 
  of 
  Auhdni 
  t 
  From 
  south 
  of 
  Sohagpur 
  to 
  Lokartalai 
  the 
  outer 
  

  

  s41l< 
  base 
  of 
  the 
  hills 
  is 
  very 
  regular, 
  the 
  crystalline 
  

  

  rocks 
  appearing 
  at 
  intervals 
  for 
  the 
  whole 
  way 
  ; 
  at 
  first 
  forming 
  low 
  hills 
  

  

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  174 
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