﻿21 
  

  

  Section 
  4. 
  — 
  (c). 
  The 
  Denwa 
  group. 
  

  

  Nothing 
  was 
  said 
  in 
  the 
  last 
  section 
  about 
  the 
  lower 
  boundary 
  of 
  

  

  the 
  Bagra 
  group, 
  with 
  the 
  Denwa 
  group. 
  As 
  with 
  

   Its 
  extension. 
  

  

  the 
  upper 
  boundary, 
  it 
  is 
  only 
  locally 
  well 
  defined. 
  

   There 
  is 
  a 
  very 
  marked 
  contrast 
  in 
  the 
  fades 
  of 
  the 
  two 
  groups, 
  but, 
  

   owing 
  to 
  the 
  variable 
  nature 
  of 
  the 
  deposits 
  of 
  the 
  upper 
  one, 
  somewhat 
  

   similar 
  beds 
  sometimes 
  occur 
  at 
  the 
  junction. 
  Nothing 
  like 
  unconformity, 
  

   unless 
  as 
  overlap, 
  can 
  be 
  made 
  out. 
  Throughout 
  the 
  greater 
  part 
  of 
  the 
  

   longitudinal 
  course 
  of 
  the 
  Denwa, 
  where 
  it 
  runs 
  westward 
  along 
  the 
  

   north 
  base 
  of 
  the 
  Pachmari 
  range, 
  the 
  valley 
  is 
  excavated 
  in 
  thick 
  beds 
  

   of 
  pale 
  greenish 
  yellow 
  and 
  bright 
  red 
  mottled 
  clays, 
  with 
  discontinuous 
  

   and 
  subordinate 
  bands 
  of 
  white 
  sandstone, 
  and 
  very 
  rare 
  courses 
  of 
  

   limestone. 
  This 
  valley 
  is 
  continuous 
  eastward 
  with 
  the 
  wide 
  transverse 
  

   valley 
  of 
  the 
  Dudhi, 
  the 
  whole 
  of 
  the 
  low 
  ground 
  being 
  occupied 
  by 
  the 
  

   same 
  clays. 
  In 
  the 
  longitudinal 
  valley 
  the 
  width 
  of 
  the 
  outcrop 
  is 
  from 
  

   two 
  to 
  four 
  miles 
  • 
  but 
  on 
  the 
  Dudhi 
  it 
  ranges 
  from 
  the 
  boundary 
  of 
  the 
  

   metamorphics 
  at 
  Dorli, 
  to 
  where 
  the 
  river 
  cuts 
  the 
  prolongation 
  of 
  the 
  

   Pachmari 
  sandstone 
  south 
  of 
  Bamni, 
  a 
  distance 
  of 
  fourteen 
  miles. 
  From 
  

   Karpapur 
  on 
  the 
  Denwa 
  these 
  beds 
  extend 
  to 
  the 
  western 
  scarp 
  of 
  the 
  

   Sitariva 
  hills, 
  forty-five 
  miles 
  ; 
  or 
  perhaps 
  the 
  red 
  mottled 
  clay 
  and 
  lime- 
  

   stone 
  in 
  the 
  bottom 
  of 
  the 
  Sitariva 
  valley 
  at 
  Bichla 
  should 
  be 
  taken 
  as 
  

   the 
  most 
  easterly 
  appearance 
  of 
  the 
  group. 
  

  

  As 
  a 
  rule, 
  the 
  Denwa 
  beds 
  are 
  overlapped 
  along 
  the 
  boundary 
  of 
  the 
  

  

  basin; 
  but 
  there 
  are 
  at 
  least 
  two 
  places 
  where 
  thev 
  

   Its 
  northern 
  outcrops. 
  x 
  J 
  

  

  are 
  seen 
  at 
  or 
  close 
  to 
  it. 
  This 
  is 
  the 
  case 
  in 
  the 
  

   Dudhi 
  ; 
  and 
  again 
  twenty-five 
  miles 
  to 
  westward, 
  near 
  Anhoni, 
  where 
  a 
  

   bay 
  has 
  been 
  weathered 
  back 
  into 
  the 
  Bagra 
  beds, 
  the 
  red 
  clays 
  and 
  white 
  

   sandstones 
  are 
  typically 
  exposed 
  in 
  the 
  low 
  ground, 
  in 
  contact 
  with 
  the 
  

   Talchirs, 
  This 
  occasional 
  appearance 
  of 
  the 
  lowest 
  group 
  of 
  the 
  whole 
  

   series, 
  in 
  this 
  position, 
  is 
  a 
  source 
  of 
  much 
  difficulty 
  ; 
  the 
  fine 
  yellow 
  

   clays 
  of 
  the 
  Denwa 
  and 
  the 
  Talchir 
  groups 
  being 
  scarcely 
  distinguishable. 
  

  

  ( 
  153 
  ) 
  

  

  