﻿DECCAN 
  TRAP. 
  47 
  

  

  It 
  was 
  at 
  one 
  time 
  thought 
  that 
  there 
  were 
  two 
  or 
  more 
  periods 
  of 
  

   All 
  the 
  trap 
  of 
  one 
  tra 
  PPean 
  intrusion 
  in 
  the 
  sedimentary 
  series 
  of 
  

   Pen 
  ° 
  ' 
  the 
  Satpura 
  basin. 
  The 
  re-distribution 
  of 
  the 
  

  

  several 
  groups 
  goes 
  far 
  to 
  invalidate 
  the 
  evidence 
  upon 
  which 
  that 
  con- 
  

   jecture 
  rested, 
  as 
  one 
  finds 
  dykes 
  nowhere 
  so 
  abundant 
  as 
  in 
  the 
  Jabal- 
  

   ptir 
  and 
  Upper 
  Mahadeva 
  groups. 
  There 
  are, 
  no 
  doubt, 
  cases 
  of 
  dykes 
  in 
  

   a 
  lower 
  group 
  that 
  cannot 
  be 
  traced 
  in 
  the 
  overlying 
  beds 
  close 
  bv 
  • 
  

   such 
  is 
  the 
  third 
  dyke 
  in 
  the 
  Sitariva 
  section, 
  which 
  is 
  strong 
  and 
  appa- 
  

   rently 
  steady 
  in 
  the 
  Talchirs, 
  but 
  no 
  sign 
  of 
  which 
  is 
  traceable 
  in 
  the 
  

   coal-mines 
  at 
  a 
  quarter 
  of 
  a 
  mile 
  to 
  eastward 
  and 
  directly 
  on 
  the 
  run 
  

   of 
  the 
  dyke. 
  In 
  every 
  such 
  ease, 
  however, 
  where 
  the 
  dyke 
  can 
  be 
  traced 
  

   to 
  its 
  termination, 
  it 
  is 
  seen 
  that 
  its 
  disappearance 
  is 
  due 
  to 
  obstruction 
  

   in 
  the 
  upper 
  rock, 
  and 
  not 
  to 
  denudation 
  during 
  interrupted 
  deposition. 
  

   There 
  is 
  a 
  very 
  pretty 
  section 
  of 
  this 
  kind 
  in 
  the 
  Eanidha 
  stream 
  just 
  

   above 
  the 
  village 
  of 
  Dongarkho 
  ; 
  a 
  dyke 
  twenty 
  yards 
  wide 
  at 
  the 
  base 
  of 
  

   the 
  section 
  is 
  entirely 
  stopped 
  out 
  in 
  a 
  number 
  of 
  wedge-like 
  tongues, 
  

   within 
  a 
  height 
  of 
  15 
  feet, 
  by 
  a 
  massive 
  bank 
  of 
  conglomerate; 
  the 
  

   rock 
  under 
  the 
  conglomerate 
  is 
  not 
  exposed. 
  

  

  That 
  all 
  the 
  intrusive 
  trap 
  belongs 
  to 
  the 
  period 
  of 
  the 
  Deccan 
  

   Belongs 
  to 
  the 
  Deccan 
  outs 
  P 
  r 
  ead 
  would 
  also 
  seem 
  evident. 
  In 
  many 
  

   rap 
  ' 
  places 
  the 
  dykes 
  are 
  confluent 
  with 
  great 
  overly- 
  

  

  ing 
  masses, 
  becoming 
  lost 
  in 
  them 
  ; 
  and 
  sheets 
  of 
  trap 
  intrusive 
  between 
  

   the 
  sedimentary 
  strata 
  are 
  continuous 
  with 
  the 
  main 
  superficial 
  flows. 
  

  

  It 
  is 
  also 
  demonstrable 
  that 
  the 
  sedimentary 
  series 
  had 
  undergone 
  

   Later 
  than 
  the 
  main 
  the 
  main 
  disturbance 
  by 
  which 
  it 
  has 
  been 
  

   t^rZ^it^X 
  affected 
  > 
  a 
  * 
  d 
  ™Y 
  extensive 
  denudation 
  (probably 
  

   aries 
  ' 
  subsequent 
  to 
  the 
  contortion), 
  before 
  the 
  advent 
  

  

  of 
  the 
  igneous 
  rock. 
  The 
  latter 
  fact 
  is 
  apparent 
  everywhere: 
  in 
  

   the 
  upland 
  valley 
  of 
  Delakari, 
  between 
  the 
  Pachmari 
  and 
  Motur 
  

   scarps, 
  there 
  are 
  ranges 
  of 
  low 
  hills 
  formed 
  entirely 
  of 
  overlying 
  

   trap; 
  again, 
  in 
  the 
  lower 
  valley 
  of 
  the 
  Dudhi 
  there 
  are 
  immense 
  

  

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