﻿18 
  EEDDEN 
  : 
  GEOLOGY 
  OF 
  KATHIAWAR 
  PENINSULA 
  IN 
  GUZERAT. 
  

  

  showing- 
  that 
  this 
  bed 
  was 
  accumulated 
  at, 
  or 
  immediately 
  subsequent 
  

   to, 
  the 
  beginning 
  of 
  the 
  trappean 
  outburst. 
  The 
  sandstone 
  is 
  gritty, 
  and 
  

   finely 
  conglomeratic 
  in 
  part, 
  though 
  distinctly 
  laminated; 
  and 
  the 
  

   enclosed 
  lumps 
  of 
  trap 
  are 
  scattered 
  irregularly 
  and 
  sparingly, 
  here 
  and 
  

   there, 
  through 
  it. 
  The 
  base 
  of 
  the 
  bed 
  is 
  not 
  exposed. 
  

  

  Trappean 
  grits. 
  — 
  The 
  laminated 
  gritty 
  and 
  trap-like 
  deposits, 
  so 
  

   strongly 
  developed 
  at 
  the 
  base 
  of 
  the 
  traps 
  in 
  Cutch, 
  1 
  are 
  but 
  poorly 
  re- 
  

   presented 
  in 
  northern 
  Kathiawar, 
  by 
  an 
  isolated 
  thin 
  patch 
  or 
  remnant, 
  

   of 
  about 
  three 
  square 
  miles 
  in 
  extent, 
  in 
  the 
  plain 
  four 
  miles 
  to 
  the 
  north 
  

   of 
  Than. 
  The 
  rock 
  is 
  identically 
  the 
  same 
  as 
  that 
  in 
  Cutch, 
  having 
  a 
  

   yellowish 
  or 
  olive-green 
  colour, 
  and 
  a 
  decomposed 
  trappean 
  appearance. 
  

   It 
  is 
  more 
  or 
  less 
  sandy 
  or 
  gritty, 
  with 
  quartz 
  grains, 
  and 
  has 
  a 
  lami- 
  

   nated, 
  or 
  rather 
  shaly 
  structure. 
  It 
  was, 
  doubtless, 
  a 
  volcanic 
  product 
  

   deposited 
  in 
  water 
  along 
  with 
  sand. 
  

  

  On 
  the 
  south 
  side 
  of 
  a 
  low 
  ridge 
  of 
  sandstone, 
  running 
  from 
  Abhe- 
  

   Gritty 
  volcanic 
  rock 
  P 
  nr 
  towards 
  Than, 
  there 
  is 
  an 
  isolated 
  mound, 
  or 
  

   near 
  Abhepur. 
  ^oss, 
  f 
  broken 
  IO 
  ck 
  projecting 
  above 
  the 
  cul- 
  

  

  tivated 
  soil. 
  The 
  weathered 
  surface 
  is 
  dark, 
  with 
  a 
  rough 
  gnarled 
  

   and 
  scoriaceous 
  appearance 
  : 
  internally, 
  the 
  rock 
  has 
  a 
  light 
  grey 
  

   colour 
  varying 
  to 
  shades 
  of 
  brown, 
  and 
  an 
  agglomeratic 
  (or 
  at 
  least 
  

   heterogeneous) 
  structure, 
  and 
  is 
  gritty 
  with 
  quartz 
  granules. 
  It 
  

   is 
  undoubtedly 
  of 
  igneous 
  origin, 
  but 
  the 
  difficulty 
  is 
  to 
  account 
  for 
  

   its 
  isolated 
  position, 
  — 
  supported, 
  as 
  it 
  is, 
  on 
  ordinary 
  light-coloured 
  Umia 
  

   sandstone, 
  which 
  is 
  visible 
  on 
  three 
  sides 
  of 
  the 
  mound. 
  It 
  appears 
  to 
  

   occupy 
  a 
  hollow 
  on 
  the 
  surface 
  of 
  the 
  sandstones 
  ; 
  the 
  mound 
  itself 
  is 
  

   not 
  more 
  than 
  20 
  yards 
  in 
  extent; 
  there 
  is 
  no 
  bedded 
  trap 
  in 
  the 
  

   neighbourhood. 
  Another 
  small 
  exposure 
  of 
  similar 
  rock 
  occurs 
  about 
  

   a 
  mile 
  and 
  a 
  quarter 
  to 
  the 
  south, 
  among 
  sandstones 
  which 
  are 
  disturbed 
  

   and 
  slightly 
  faulted 
  with 
  dykes, 
  but 
  its 
  position 
  here 
  is 
  not 
  the 
  less 
  

   enigmatical. 
  

  

  The 
  miscellaneous 
  accumulations 
  of 
  earthy 
  felstones, 
  volcanic 
  ash 
  

  

  1 
  See 
  Memoirs, 
  Geol. 
  Sur., 
  India, 
  Vol. 
  IX, 
  p. 
  56. 
  

  

  ( 
  90 
  ) 
  

  

  