﻿76 
  THEOBALD 
  : 
  GEOLOGY 
  OP 
  PEGU. 
  

  

  but 
  which 
  in 
  reality 
  lies 
  within 
  the 
  area 
  of 
  the 
  clayey 
  beds 
  of 
  this 
  group, 
  

   denuded 
  of 
  its 
  uppermost 
  sands. 
  I 
  am 
  inclined 
  to 
  think 
  that 
  these 
  clayey 
  

   beds 
  are 
  rather 
  more 
  developed 
  as 
  respects 
  thickness 
  in 
  the 
  Tonghoo 
  

   district; 
  than 
  they 
  are 
  in 
  Prome, 
  and 
  are 
  perhaps 
  a 
  trifle 
  coarser 
  and 
  less 
  

   homogenous. 
  One 
  of 
  the 
  best 
  sections 
  I 
  know 
  of 
  these 
  beds 
  is 
  on 
  the 
  

   main 
  road 
  running 
  from 
  Tonghoo 
  to 
  the 
  frontier, 
  between 
  the 
  villages 
  of 
  

   Nyoung 
  Kyat 
  and 
  Myohla, 
  where 
  the 
  road 
  descends 
  from 
  the 
  high 
  plateau 
  

   formed 
  by 
  these 
  clays, 
  to 
  the 
  alluvial 
  plain 
  of 
  the 
  Sittoung, 
  one 
  and 
  three 
  

   quarter 
  miles 
  South-west 
  of 
  the 
  latter 
  village. 
  The 
  deposit 
  is 
  here 
  seen 
  to 
  

   consist 
  of 
  a 
  thick 
  bed 
  of 
  sandy 
  clay, 
  devoid 
  of 
  any 
  distinct 
  bedding, 
  and 
  

   with 
  but 
  a 
  few 
  small 
  pebbles 
  dispersed 
  through 
  it. 
  Locally 
  these 
  peb- 
  

   bles 
  are 
  commoner, 
  as 
  they 
  may 
  sometimes 
  be 
  seen 
  on 
  the 
  surface, 
  

   weathered 
  out 
  of 
  the 
  clay, 
  though 
  their 
  presence 
  is 
  exceptional. 
  It 
  is 
  

   commoner 
  to 
  find 
  a 
  little 
  grouty 
  laterite 
  strewed 
  over 
  the 
  surface, 
  and 
  

   in 
  places 
  the 
  clay 
  itself 
  is 
  converted 
  at 
  the 
  surface 
  into 
  tolerably 
  compact 
  

   laterite, 
  quite 
  undistinguishable 
  from 
  the 
  laterite 
  pertaining 
  to 
  the 
  

   newer 
  deposits 
  on 
  the 
  opposite 
  side 
  of 
  the 
  Sittoung 
  further 
  to 
  the 
  

   South 
  near 
  Shuay-gheen. 
  This 
  leads 
  me 
  to 
  notice 
  one 
  of 
  the 
  most 
  

   curious 
  and 
  deceptive 
  instance 
  of 
  change 
  of 
  mineral 
  character 
  in 
  the 
  

   present 
  group 
  that 
  I 
  am 
  acquainted 
  with, 
  though 
  it 
  is 
  of 
  local 
  charac- 
  

   ter 
  and 
  dependant 
  on 
  the 
  conditions 
  under 
  which 
  the 
  deposit 
  here 
  

   originated. 
  

  

  I 
  have 
  already 
  mentioned 
  the 
  great 
  belt 
  of 
  laterite 
  which 
  is 
  shown 
  in 
  

   Dr. 
  J. 
  MacClelland's 
  sketch 
  map 
  of 
  the 
  district, 
  and 
  which 
  gives 
  a 
  fair 
  con- 
  

   ventional 
  idea 
  of 
  the 
  relation 
  of 
  that 
  rock 
  to 
  the 
  older 
  and 
  younger 
  deposits 
  

   which 
  it 
  separates, 
  as 
  far 
  as 
  the 
  Southern 
  portion 
  of 
  the 
  Martaban 
  district 
  

   is 
  concerned; 
  but 
  as 
  a 
  matter 
  of 
  fact, 
  little 
  or 
  no 
  laterite, 
  certainly 
  

   nothing 
  like 
  a 
  continuous 
  deposit, 
  occurs 
  from 
  North 
  of 
  the 
  village 
  of 
  

   Paday 
  to 
  the 
  frontier, 
  a 
  distance 
  of 
  28 
  miles. 
  Towards 
  the 
  frontier 
  the 
  

   alluvial 
  plain 
  of 
  the 
  Sittoung 
  is 
  bounded 
  by 
  rising 
  ground, 
  most 
  of 
  it 
  exceed- 
  

   ingly 
  Hat, 
  arid, 
  and 
  uninhabited 
  in 
  consequence, 
  composed 
  of 
  the 
  clayey 
  

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