﻿16 
  medlicott: 
  satpura 
  coal-basin. 
  

  

  With 
  these 
  changes 
  commence 
  the 
  difficulties 
  of 
  classification 
  that 
  

  

  were 
  indicated 
  in 
  the 
  general 
  sketch 
  of 
  the 
  main 
  

   In 
  the 
  Sitariva 
  area. 
  

  

  cross-section. 
  Taken 
  on 
  certain 
  sections 
  the 
  

  

  natural 
  divisions 
  are 
  plain 
  enough 
  ; 
  but 
  owing 
  to 
  the 
  transitional 
  charac- 
  

   ter 
  of 
  the 
  several 
  groups 
  one 
  with 
  another, 
  it 
  would 
  be 
  impossible,, 
  in 
  the 
  

   absence 
  of 
  fossils, 
  without 
  perfect 
  maps, 
  and 
  an 
  immense 
  expenditure 
  of 
  

   time 
  and 
  labour, 
  to 
  lay 
  down 
  accurate 
  lines 
  of 
  demarcation. 
  On 
  the 
  

   summit 
  of 
  the 
  ridges 
  at 
  the 
  mouth 
  of 
  the 
  Sitariva 
  gorge 
  the 
  Jabalpur 
  

   group, 
  as 
  already 
  described, 
  is 
  well 
  represented. 
  There 
  are 
  500 
  to 
  600 
  

   feet 
  of 
  sandstone, 
  with 
  pale 
  shales 
  containing 
  strings 
  of 
  the 
  characteristic 
  

   jet-cual 
  in 
  its 
  lower-middle 
  portion. 
  These 
  are 
  best 
  seen 
  in 
  the 
  cliffs 
  on 
  

   the 
  south 
  face 
  of 
  Nimugarh 
  hill. 
  The 
  lower 
  mass 
  of 
  the 
  hill, 
  some 
  600 
  

   feet, 
  is 
  formed 
  of 
  coarse 
  massive 
  conglomerates 
  in 
  rusty 
  clays 
  and 
  earthy 
  

   sandstone, 
  with 
  some 
  courses 
  of 
  dolomitic 
  limestone. 
  Along 
  the 
  outer 
  

   face 
  of 
  the 
  range 
  the 
  two 
  groups 
  are 
  distinctly 
  defined, 
  the 
  one 
  forming 
  

   the 
  cliff, 
  the 
  other 
  the 
  under-cliff. 
  Within 
  the 
  hills 
  the 
  division 
  is 
  still 
  

   well 
  maintained, 
  as 
  in 
  the 
  Mari 
  cliffs, 
  five 
  miles 
  up 
  the 
  gorge 
  of 
  the 
  river, 
  

   where 
  the 
  second 
  band 
  of 
  shale 
  with 
  coal 
  is 
  seen 
  at 
  the 
  base 
  of 
  the 
  lower 
  

   sandstone 
  cliff; 
  the 
  underlying 
  rusty 
  clays 
  and 
  sandstone 
  being 
  still 
  

   in 
  force, 
  but 
  only 
  sparingly 
  conglomeritic. 
  

  

  There 
  is 
  thus 
  exhibited 
  a 
  marked 
  contrast 
  between 
  the 
  sections 
  on 
  

  

  ,„ 
  , 
  ... 
  „ 
  ,, 
  the 
  Sakar 
  and 
  the 
  Sitariva. 
  The 
  strong 
  cono-lo- 
  

  

  Western 
  outliers 
  or 
  the 
  ° 
  ° 
  

  

  grou 
  P- 
  merates 
  at 
  the 
  edge 
  of 
  the 
  basin 
  are 
  somewhat 
  

  

  similar 
  in 
  both 
  ; 
  the 
  preponderance 
  of 
  a 
  red 
  earthy 
  matrix 
  to 
  the 
  west 
  

   being 
  the 
  chief 
  difference. 
  But 
  the 
  stratigraphical 
  relation 
  is 
  very 
  

   different. 
  On 
  the 
  Sakar 
  the 
  whole 
  may 
  be 
  taken 
  as 
  belonging 
  to 
  the 
  

   Jabalpur 
  horizon, 
  only 
  about 
  50 
  feet 
  of 
  the 
  conglomerate 
  passing 
  

   under 
  the 
  bottom 
  shales 
  at 
  a 
  mile 
  from 
  the 
  boundary 
  ; 
  whereas 
  on 
  the 
  

   Sitariva 
  there 
  is 
  no 
  sign 
  of 
  horizontal 
  transition, 
  both 
  groups 
  maintain- 
  

   ing 
  their 
  distinctness 
  for 
  a 
  considerable 
  distance. 
  The 
  Jabalpur 
  group 
  

  

  proper, 
  (a) 
  of 
  the 
  general 
  section, 
  is 
  the 
  dominant 
  rock 
  in 
  the 
  Sitariva 
  

   ( 
  IIS 
  ) 
  

  

  