﻿120 
  THEOBALD 
  : 
  GEOLOGY 
  OF 
  PEGU. 
  

  

  portions 
  of 
  the 
  shaly 
  matrix 
  are 
  seen 
  enveloped 
  and 
  preserved. 
  A 
  very 
  

   little 
  hydrated 
  peroxide 
  of 
  iron 
  in 
  small 
  lumps 
  is 
  seen 
  lying- 
  about, 
  but 
  

   nothing 
  else 
  to 
  indicate 
  any 
  peculiarity 
  , 
  still 
  less 
  volcanic 
  action. 
  The 
  

   form 
  of 
  the 
  low 
  mound 
  suggests 
  a 
  certain 
  amount 
  of 
  intumescence 
  or 
  

   upheaving 
  of 
  the 
  clay 
  having 
  taken 
  place, 
  but 
  in 
  the 
  case 
  of 
  the 
  Ngan- 
  

   khyoung 
  ' 
  volcano' 
  this 
  is 
  less 
  seen, 
  and 
  I 
  am 
  inclined 
  to 
  pronounce 
  the 
  

   ' 
  mud 
  volcano' 
  in 
  either 
  case 
  as 
  the 
  vent 
  for 
  a 
  very 
  feeble 
  discharge 
  of 
  

   marsh-gas. 
  In 
  the 
  rains, 
  when 
  the 
  surface 
  was 
  plastic, 
  a 
  feeble 
  ebulli- 
  

   tion 
  of 
  gas 
  would 
  be 
  quite 
  adequate 
  to 
  produce 
  the 
  low 
  mound 
  in 
  

   question, 
  which 
  on 
  drying 
  would 
  present 
  the 
  incoherent 
  heap 
  of 
  shale 
  

   fragments 
  I 
  have 
  described; 
  the 
  combustion 
  of 
  the 
  marsh-gas 
  at 
  

   some 
  period 
  or 
  other 
  from 
  burning 
  grass, 
  probably 
  attracting 
  notice 
  

   during 
  the 
  night 
  to 
  the 
  locality. 
  We 
  have 
  here, 
  on 
  an 
  extremely 
  

   minute 
  scale, 
  a 
  repetition 
  of 
  the 
  phenomena 
  which 
  have 
  produced 
  the 
  

   ' 
  volcano' 
  on 
  Ramri 
  Island 
  ; 
  and 
  which 
  I 
  may 
  remark 
  has 
  nothing 
  volcanic 
  

   about 
  it, 
  the 
  emission 
  of 
  flame 
  being 
  probably 
  due' 
  to 
  the 
  ignition 
  of 
  

   a 
  copious 
  evolution 
  of 
  marsh-gas. 
  It 
  is 
  not 
  necessary 
  to 
  enter 
  more 
  fully 
  

   on 
  this 
  subject 
  here, 
  as 
  I 
  shall 
  elsewhere 
  describe 
  the 
  manner 
  in 
  which 
  

   marsh-gas 
  is 
  evolved 
  at 
  many 
  points 
  in 
  Pegu 
  on 
  about 
  the 
  same 
  

   parallel 
  as 
  the 
  Ramri 
  ' 
  volcano/ 
  only 
  on 
  opposite 
  sides 
  of 
  the 
  Arakan 
  

   range. 
  

  

  South 
  of 
  Kyeantalee 
  several 
  small 
  outcrops 
  of 
  limestone 
  occur, 
  in 
  none 
  

   of 
  which 
  can 
  organic 
  remains 
  be 
  detected, 
  and 
  some 
  of 
  which 
  limestone 
  has 
  

   been 
  much 
  altered. 
  On 
  both 
  sides 
  of 
  the 
  Kyeantalee 
  river 
  near 
  its 
  mouth 
  

   small 
  outcrops 
  occur 
  of 
  limestone 
  quite 
  unaltered. 
  But 
  whether 
  

   all 
  of 
  the 
  above 
  limestones 
  are 
  subordinate 
  to 
  the 
  Nummulitic 
  group, 
  

   is 
  not 
  easy 
  to 
  say 
  ; 
  I 
  am 
  inclined 
  to 
  think 
  not 
  ; 
  and 
  I 
  only 
  include 
  them 
  

   in 
  the 
  present 
  group 
  as 
  a 
  provisional 
  arrangement, 
  till 
  something 
  more 
  

   definite 
  is 
  known 
  of 
  the 
  relations 
  of 
  the 
  Nummulitic 
  and 
  Secondary 
  

   rocks 
  in 
  Arakan. 
  In 
  Pegu, 
  the 
  utter 
  absence 
  of 
  fossils 
  along 
  this 
  

   horizon 
  and 
  the 
  alteration 
  induced 
  in 
  the 
  rocks 
  themselves, 
  no 
  less 
  

  

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