﻿78 
  THEOBALD 
  : 
  GEOLOGY 
  OF 
  PEGU. 
  

  

  the 
  road 
  South 
  from 
  Kon-meng-eing 
  to 
  Hlay-my-oung, 
  and 
  thence 
  to 
  the 
  

   well-known 
  Pagodas 
  at 
  Myar-soh-ni-moung, 
  five 
  miles 
  East-south-east 
  of 
  

   Tonghoo 
  on 
  the 
  North 
  bank 
  of 
  the 
  Thouk-yay-gat. 
  North 
  of 
  Hlay-my- 
  

   oung 
  it 
  is 
  not 
  usual 
  to 
  find 
  stones 
  in 
  the 
  clay 
  larger 
  than 
  would 
  be 
  ordinarily 
  

   called 
  pebbles, 
  and 
  which 
  in 
  the 
  aggregate 
  might 
  be 
  termed 
  gravel 
  ; 
  but 
  

   between 
  Hlay-my-oung 
  and 
  Myar-soh-ni-moung 
  these 
  stones 
  in 
  many 
  

   spots 
  give 
  place 
  to 
  the 
  coarsest 
  shingle, 
  with 
  pebbles 
  averaging 
  three 
  or 
  

   four 
  inches 
  in 
  length, 
  and 
  not 
  rarely 
  containing 
  boulders 
  six 
  or 
  eight 
  

   inches 
  or 
  more 
  long. 
  Where 
  this 
  coarser 
  shingle 
  is 
  most 
  abundant, 
  the 
  

   clayey 
  element 
  is 
  proportionately 
  diminished, 
  and 
  the 
  rock 
  passes 
  into 
  

   what 
  may 
  be 
  called 
  a 
  mortar 
  bed 
  of 
  the 
  coarsest 
  shingle 
  cemented 
  into 
  a 
  

   compact 
  rock 
  by 
  a 
  sandy 
  ferruginous 
  clay 
  or 
  laterite 
  ; 
  in 
  fact 
  this 
  laterite, 
  

   though 
  I 
  have 
  said 
  it 
  belongs 
  to 
  the 
  fossil-wood 
  group, 
  is 
  undistinguishable 
  

   from 
  the 
  laterite 
  of 
  Martaban 
  to 
  the 
  South, 
  of 
  a 
  newer 
  date, 
  and 
  the 
  

   reason 
  is 
  doubtless, 
  either 
  that 
  both 
  are 
  derived 
  from 
  the 
  waste 
  of 
  the 
  

   same 
  rocks 
  in 
  the 
  Poungloung 
  hills 
  to 
  the 
  Eastward, 
  or 
  what 
  may 
  partly 
  

   be 
  the 
  case, 
  the 
  newer 
  laterite 
  is 
  largely 
  composed 
  of 
  detritus 
  produced 
  

   by 
  the 
  denudation 
  of 
  the 
  lateritous 
  beds 
  of 
  the 
  present 
  group. 
  

  

  The 
  cause 
  of 
  this 
  great 
  difference 
  in 
  lithological 
  character 
  in 
  these 
  

   beds., 
  from 
  that 
  anywhere 
  noticed 
  to 
  the 
  Westward, 
  seems 
  to 
  me 
  suffi- 
  

   ciently 
  obvious, 
  and 
  lies 
  in 
  the 
  fact 
  that 
  the 
  Poungloung 
  range 
  of 
  hills 
  

   formed 
  the 
  Eastern 
  shore 
  of 
  that 
  Pliocene, 
  and 
  in 
  part 
  probably 
  Post 
  

   Pliocene 
  sea, 
  wherein 
  the 
  whole 
  fossil-wood 
  group 
  was 
  deposited 
  ; 
  and 
  

   that 
  these 
  coarse 
  outliers 
  are 
  the 
  remnants 
  of 
  a 
  zone 
  of 
  similar 
  character 
  

   which 
  fringed 
  its 
  shores 
  wherever 
  they 
  were 
  favorable 
  for 
  its 
  production 
  ; 
  

   and 
  it 
  is 
  quite 
  within 
  the 
  bounds 
  of 
  the 
  probable, 
  that 
  the 
  coarse 
  shingle 
  

   and 
  boulders 
  I 
  have 
  described 
  as 
  scattered 
  over 
  the 
  hill 
  slopes 
  in 
  Western 
  

   Prome, 
  especially 
  along 
  the 
  Mudday 
  Choung, 
  may 
  be 
  the 
  debris 
  of 
  a 
  

   similar 
  local 
  deposit, 
  now 
  too 
  much 
  broken 
  up 
  and 
  denuded 
  to 
  be 
  cog- 
  

   nisable 
  as 
  such, 
  but 
  which 
  originally 
  marked 
  the 
  western 
  shores 
  of 
  the 
  

   Post 
  Pliocene 
  sea, 
  and 
  coincided 
  in 
  general 
  terms 
  with 
  the 
  line 
  of 
  the 
  

  

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