﻿24 
  FEDDEN: 
  GEOLOGY 
  OF 
  KATHIAWAR 
  PENINSULA 
  IN 
  GUZERAT. 
  

  

  Mr. 
  Theobald 
  mentions 
  in 
  his 
  manuscript 
  report 
  1 
  the 
  occurrence, 
  on 
  

   one 
  of 
  the 
  spurs 
  of 
  the 
  hills 
  south-east 
  of 
  Junagarh, 
  of 
  a 
  a 
  small 
  patch 
  

   (whose 
  exact 
  extent 
  I 
  have 
  not 
  yet 
  traced) 
  " 
  of 
  metamorphosed 
  rock 
  — 
  

   a 
  coarse 
  quartzite, 
  with 
  bands 
  of 
  conglomerate 
  irregularly 
  disposed 
  

   through 
  it, 
  containing 
  numerous 
  rolled 
  quartz 
  pebbles/'' 
  I 
  myself 
  

   picked 
  up 
  in 
  the 
  plain 
  beyond 
  the 
  western 
  range, 
  a 
  specimen 
  answering 
  

   this 
  description, 
  an 
  altered 
  conglomeratic 
  quartz 
  grit; 
  but 
  the 
  rock 
  

   was 
  not 
  found 
  in 
  situ, 
  and 
  I 
  take 
  it 
  to 
  be 
  an 
  indurated 
  portion 
  of 
  some 
  

   pre-trappean 
  bed 
  floated 
  up 
  with 
  the 
  lavas 
  of 
  the 
  period 
  under 
  considera- 
  

   tion. 
  

  

  The 
  hill 
  of 
  Osham, 
  which 
  rises 
  abruptly 
  out 
  of 
  the 
  plain 
  14 
  miles 
  

   west-north-west 
  of 
  Junagarh, 
  is 
  an 
  isolated 
  block, 
  

  

  Osham 
  hill. 
  

  

  mainly 
  composed 
  of 
  homogeneous 
  tracnytic 
  reJsite, 
  

   boldly 
  scarped 
  and 
  presenting 
  in 
  many 
  places 
  beetling 
  cliffs 
  of 
  200 
  feet 
  

   and 
  upwards 
  in 
  height. 
  The 
  eastern 
  base 
  of 
  the 
  hill 
  consists 
  of 
  a 
  soft, 
  

   decaying 
  amygdaloid, 
  with 
  kernels 
  of 
  a 
  yellow 
  soapy 
  mineral, 
  and 
  quartz 
  

   geodes. 
  The 
  thickness 
  of 
  this 
  bed 
  is 
  not 
  seen. 
  Above 
  it, 
  but 
  generally 
  

   Pitchstoue 
  and 
  tracby- 
  concealed 
  by 
  a 
  talus 
  of 
  fallen 
  rock, 
  occurs 
  a 
  bed 
  of 
  

   felsite 
  - 
  pitchstone 
  a 
  few 
  feet 
  in 
  thickness, 
  thinly 
  laminated, 
  

  

  but 
  granular 
  and 
  friable 
  in 
  part. 
  These 
  two 
  rocks 
  constitute 
  barely 
  

   one-fourth 
  of 
  the 
  hill-side, 
  the 
  summit 
  being 
  composed 
  of 
  a 
  thick 
  mass 
  of 
  

   the 
  trachy-felsite, 
  the 
  fallen 
  blocks 
  from 
  whose 
  steeply-scarped 
  sides 
  

   conceal 
  to 
  a 
  great 
  extent 
  the 
  softer 
  beds 
  on 
  which 
  it 
  rests. 
  This 
  

   trachy-felsite 
  is 
  also 
  much 
  laminated, 
  and 
  presents 
  the 
  appearance 
  of 
  

   woody 
  fibre, 
  which 
  results 
  from 
  the 
  curvature 
  and 
  involution 
  of 
  the 
  

   planes 
  of 
  lamination, 
  which 
  themselves 
  seem 
  to 
  arise 
  from 
  the 
  move- 
  

   ment 
  of 
  the 
  mass 
  when 
  in 
  a 
  viscous, 
  or 
  pasty 
  state 
  ; 
  so 
  that 
  the 
  laminae 
  

   are 
  often 
  seen 
  horizontal 
  and 
  then 
  bent 
  down, 
  and 
  rolled 
  over, 
  as 
  from 
  

   the 
  gradual 
  progression 
  of 
  the 
  mass. 
  The 
  surface 
  of 
  the 
  laminae 
  is 
  either 
  

   smooth 
  or 
  rumpled. 
  2 
  

  

  The 
  beds 
  in 
  this 
  part 
  of 
  the 
  hill 
  have 
  a 
  slight 
  slope 
  westwards, 
  but 
  in 
  

  

  1 
  Season 
  1857-58. 
  

  

  a 
  Mr. 
  Theobald 
  (loc. 
  cit) 
  

  

  ( 
  96 
  ) 
  

  

  