﻿GONDWANA 
  SANDSTONE. 
  21 
  

  

  bed 
  of 
  pink 
  sandstone 
  which 
  may 
  belong 
  to 
  the 
  Vindhyan 
  system. 
  At 
  

   Katkut 
  these 
  beds 
  pass 
  into 
  conglomerates 
  and 
  sandstones 
  undistinguish- 
  

   able 
  from 
  the 
  Ghatia 
  rock 
  ; 
  and 
  2 
  miles 
  east 
  of 
  the 
  town 
  they 
  have 
  been 
  

   largely 
  quarried 
  from 
  remote 
  antiquity. 
  The 
  sandstones 
  thin 
  away 
  to 
  the 
  

   north, 
  being 
  reduced 
  to 
  a 
  conglomeratic 
  band 
  north 
  of 
  Chandupura, 
  

   which 
  is 
  traceable 
  with 
  occasional 
  increase 
  of 
  thickness 
  by 
  the 
  super- 
  

   position 
  of 
  a 
  few 
  feet 
  of 
  fine-grained 
  rocks 
  along 
  the 
  northern 
  edge 
  of 
  

   the 
  Dhar 
  forest 
  to 
  Mansingpura, 
  30 
  miles 
  north-east 
  of 
  Barwai. 
  

  

  Two 
  quite 
  insignificant, 
  hardly 
  mapable, 
  patches 
  of 
  sandstone 
  occur 
  

   at 
  Rupabari, 
  a 
  mile 
  south-east 
  of 
  Barwai. 
  A 
  similar 
  rock 
  is 
  met 
  with 
  

   at 
  Ahkund, 
  10 
  miles 
  south-east 
  of 
  Mortukka. 
  Here, 
  too, 
  the 
  area 
  covered 
  

   is 
  very 
  small. 
  

  

  The 
  base 
  of 
  the 
  sandstones 
  in 
  this 
  last 
  instance 
  was 
  not 
  visible. 
  At 
  

   Rupabari, 
  Ghatia, 
  Katkut, 
  and 
  throughout 
  the 
  Dhar 
  forest, 
  they 
  rest 
  

   upon 
  either 
  metamorphic 
  or 
  sub-metamorphic 
  rocks. 
  Their 
  thickness 
  is 
  

   greatest 
  at 
  the 
  Ghatia 
  and 
  Katkut 
  quarries 
  ; 
  and 
  it 
  does 
  not 
  exceed 
  80 
  

   feet. 
  Everywhere 
  the 
  rock 
  is 
  horizontally 
  bedded. 
  

  

  Relations 
  to 
  later 
  rocks. 
  — 
  At 
  Ahkund 
  the 
  sandstones 
  are 
  succeeded 
  

   above 
  with 
  apparent 
  conformity 
  by 
  calcareous 
  beds, 
  with 
  fresh-water 
  

   shells 
  at 
  the 
  top 
  having 
  inter- 
  trappean 
  affinities. 
  .These 
  beds 
  are 
  covered 
  

   up 
  by 
  the 
  Deccan 
  trap. 
  At 
  Rupabari, 
  inter-trappean 
  limestones 
  with 
  

   the 
  usual 
  fresh-water 
  fossils 
  are 
  met 
  with 
  in 
  close 
  proximity 
  to 
  the 
  

   sandstones. 
  But 
  the 
  stratigraphical 
  relation 
  between 
  the 
  two 
  is 
  obscure. 
  

   The 
  Katkut 
  and 
  Dhar 
  forest 
  beds 
  pass 
  directly 
  under 
  the 
  trap 
  forma- 
  

   tion. 
  Such 
  is 
  also 
  the 
  case 
  north 
  and 
  west 
  of 
  Ghatia. 
  At 
  the 
  south- 
  

   western 
  corner 
  of 
  the 
  upland, 
  however, 
  down 
  in 
  the 
  valley 
  of 
  the 
  Odali, 
  

   an 
  interesting 
  intervention 
  of 
  fossiliferous 
  beds 
  occurs. 
  These 
  are 
  quite 
  

   insignificant 
  in 
  thickness 
  and 
  extent, 
  measuring 
  not 
  more 
  than 
  8 
  feet, 
  

   and 
  appearing 
  as 
  a 
  mere 
  speck 
  on 
  the 
  map. 
  Their 
  existence 
  was 
  brought 
  

   to 
  light 
  by 
  Mr. 
  Moore, 
  the 
  engineer 
  in 
  charge 
  of 
  the 
  Ghatia 
  quarries, 
  

   while 
  the 
  Narbada 
  viaduct, 
  on 
  the 
  Indore 
  State 
  Railway, 
  was 
  under 
  con- 
  

   struction. 
  1 
  He 
  discovered 
  an 
  oyster-bed 
  a 
  foot 
  and 
  a 
  half 
  thick, 
  and 
  

  

  1 
  Kecords, 
  Vol. 
  VII, 
  pt. 
  3, 
  p. 
  73. 
  

  

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  21 
  ) 
  

  

  