﻿112 
  THEOBALD: 
  GEOLOGY 
  OP 
  PEGU. 
  

  

  character 
  are 
  scattered, 
  of 
  too 
  great 
  a 
  size 
  to 
  have 
  suffered 
  transport 
  from 
  

   any 
  considerable 
  distance. 
  These 
  blocks 
  are 
  of 
  a 
  cherty 
  nature, 
  and 
  some 
  

   of 
  them 
  not 
  less 
  than 
  one 
  hundred 
  feet 
  in 
  circumference. 
  It 
  does 
  

   not, 
  however, 
  appear 
  to 
  me 
  necessary 
  to 
  regard 
  them 
  as 
  relics 
  of 
  an 
  

   unconformable 
  bed, 
  but 
  simply 
  as 
  remnants 
  of 
  beds 
  once 
  intercalated 
  

   among 
  the 
  beds 
  whereon 
  they 
  rest, 
  and 
  being 
  almost 
  beyond 
  the 
  power 
  

   of 
  the 
  waves 
  to 
  destroy, 
  have 
  subsided 
  into 
  their 
  present 
  position 
  from 
  

   contorted 
  portions 
  of 
  strata 
  now 
  removed 
  by 
  denudation. 
  The 
  extreme 
  

   disturbance 
  to 
  which 
  these 
  beds 
  have 
  been 
  locally 
  subjected, 
  and 
  the 
  

   very 
  partial 
  development 
  of 
  such 
  silicified 
  masses 
  as 
  those 
  in 
  question, 
  

   renders 
  such 
  an 
  explanation 
  of 
  the 
  seeming 
  unconformity 
  here 
  seen,, 
  

   even 
  more 
  probable 
  than 
  the 
  more 
  obvious 
  interpretation 
  first 
  adopted 
  

   by 
  me. 
  Were 
  it 
  not 
  so, 
  and 
  did 
  a 
  real 
  unconformity 
  exist 
  between 
  two 
  

   groups 
  about 
  the 
  level 
  of 
  high-water-mark, 
  or 
  between 
  tidemarks, 
  it 
  would 
  

   seem 
  strange 
  that 
  no 
  undoubted 
  illustrations 
  of 
  such 
  unconformity 
  are 
  

   elsewhere 
  seen 
  along 
  the 
  coast. 
  Yet 
  at 
  only 
  one 
  or 
  two 
  spots 
  do 
  such 
  

   instances 
  occur 
  of 
  apparent 
  unconformity, 
  and 
  these 
  are 
  not 
  in 
  my 
  

   opinion 
  incapable 
  of 
  another 
  explanation, 
  and 
  are 
  quite 
  insufficient 
  to 
  

   enable 
  us 
  to 
  separate 
  the 
  somewhat 
  miscellaneous 
  assemblage 
  of 
  beds 
  

   comprehended 
  under 
  the 
  present 
  title. 
  Should, 
  however, 
  real 
  uncon- 
  

   formity 
  be 
  established 
  (which, 
  without 
  admitting, 
  may 
  be 
  very 
  possible), 
  

   the 
  newer 
  of 
  the 
  unconformable 
  beds 
  must 
  of 
  course 
  be 
  regarded 
  as 
  

   belonging 
  to 
  the 
  Nummulitic 
  group, 
  the 
  lower, 
  to 
  the 
  Negrais 
  band 
  as 
  

   at 
  present 
  characterised. 
  

  

  The 
  difference 
  in 
  mineral 
  character 
  in 
  the 
  Negrais 
  rocks 
  is 
  

   very 
  great. 
  In 
  some 
  places 
  flaggy 
  and 
  massive 
  sandstones 
  occur 
  

   quite 
  unaltered 
  and 
  dipping 
  at 
  moderate 
  angles, 
  whilst 
  in 
  places 
  sec- 
  

   tions 
  are 
  exposed 
  of 
  highly 
  altered 
  shales 
  and 
  sandstones; 
  and 
  in 
  

   some 
  spots 
  the 
  sandstone 
  is 
  seen 
  converted 
  into 
  a 
  cherty 
  rock 
  seamed 
  

   with 
  silica 
  and 
  evidently 
  subjected 
  to 
  alteration 
  of 
  an 
  intense 
  kind. 
  

   In 
  a 
  less 
  degree, 
  this 
  is 
  precisely 
  the 
  capricious 
  sort 
  of 
  sub-metamorphism 
  

  

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  300 
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