﻿96 
  THEOBALD 
  : 
  GEOLOGY 
  OE 
  PEGU. 
  

  

  the 
  frontier 
  village 
  of 
  Geing-yai, 
  lying 
  eight 
  miles 
  West 
  of 
  Phoungae- 
  

   ing. 
  It 
  is 
  certain 
  that 
  the 
  limestone 
  terminates 
  at 
  this 
  spot, 
  as 
  does 
  

   the 
  ridge 
  likewise, 
  and 
  cannot 
  be 
  traced 
  farther 
  North 
  ; 
  but 
  the 
  country 
  

   is 
  so 
  wooded 
  that 
  it 
  is 
  quite 
  possible 
  this 
  may 
  be 
  the 
  result 
  of 
  denu- 
  

   dation. 
  Considering, 
  however, 
  the 
  section 
  near 
  Pimakhon 
  and 
  another 
  

   I 
  shall 
  presently 
  describe, 
  I 
  am 
  inclined 
  to 
  refer 
  the 
  disappearance 
  of 
  

   the 
  limestone, 
  less 
  to 
  denudation 
  than 
  to 
  the 
  dying-out 
  and 
  original 
  

   limitation 
  of 
  the 
  rock. 
  From 
  this 
  Northernmost 
  point 
  of 
  this 
  rock, 
  

   its 
  general 
  bearing 
  is 
  about 
  South-east-by-south 
  for 
  a 
  distance 
  of 
  

   twelve 
  miles, 
  when 
  it 
  dies 
  out 
  on 
  the 
  flank 
  of 
  a 
  low 
  spur 
  at 
  a 
  point 
  

   almost 
  midway 
  between 
  Thambula 
  and 
  Pyengeing 
  (or 
  Pimaeing), 
  a 
  

   village 
  thirteen 
  miles 
  South 
  of 
  Phoungaeing. 
  A 
  little 
  above 
  this 
  a 
  

   section 
  is- 
  seen 
  in 
  an 
  affluent 
  to 
  the 
  Thambula 
  stream, 
  which 
  throws 
  

   much 
  light 
  on 
  the 
  Pimakhon 
  section, 
  and 
  the 
  somewhat 
  abrupt 
  dis- 
  

   appearance 
  of 
  the 
  limestone 
  there 
  as 
  I 
  have 
  already 
  described.* 
  A 
  

   stream 
  here 
  intersects 
  the 
  Nummulitics 
  a 
  little 
  above 
  the 
  termination 
  

   of 
  the 
  Nummulitic 
  limestone 
  which 
  dies 
  out 
  on 
  the 
  slope 
  of 
  a 
  very 
  steep 
  

   and 
  precipitous 
  ridge, 
  of 
  which 
  it 
  may 
  be 
  regarded 
  as 
  constituting 
  the 
  

   core. 
  Climbing 
  this 
  ridge, 
  the 
  limestone 
  is 
  seen 
  confusedly 
  arranged, 
  

   but 
  seeming 
  vertical, 
  and 
  striking 
  across 
  the 
  small 
  stream 
  here 
  intersecting 
  

   the 
  group. 
  In 
  the 
  stream 
  below 
  this 
  limestone, 
  blocks 
  are 
  plentiful, 
  but 
  I 
  

   traced 
  them 
  up 
  till 
  they 
  ceased 
  without 
  at 
  first 
  detecting 
  the 
  Nummulitic 
  

   limestone 
  in 
  situ. 
  Retracing 
  my 
  steps 
  I 
  soon 
  found 
  that 
  no 
  thick 
  massive 
  

   bed 
  of 
  limestone 
  existed 
  here, 
  but 
  that 
  the 
  limestone 
  seen 
  on 
  the 
  hill 
  above 
  

   and 
  in 
  the 
  bed 
  of 
  the 
  stream, 
  occurred 
  as 
  thickish 
  slabs 
  or 
  courses 
  of 
  rock 
  

   in 
  a 
  bed 
  of 
  yellow 
  shale, 
  which 
  fully 
  accounted 
  for 
  the 
  confused 
  arrange- 
  

   ment 
  of 
  the 
  rock 
  on 
  the 
  flanks 
  of 
  the 
  hill, 
  and 
  how 
  from 
  its 
  subordinate 
  

  

  * 
  The 
  map 
  is 
  here 
  somewhat 
  incorrect, 
  as 
  in 
  it, 
  Pyengeng 
  is 
  represented 
  as 
  

   separated 
  from 
  Thambula 
  by 
  an 
  unbroken 
  range, 
  the 
  water 
  from 
  the 
  former 
  village 
  being 
  

   represented 
  as 
  flowing 
  South 
  into 
  the 
  Mahton 
  near 
  Choung-kwa, 
  whereas 
  in 
  reality 
  it 
  

   flows 
  North 
  and 
  then 
  West 
  from 
  Thambula, 
  through 
  a 
  gorge 
  in 
  the 
  Nummulitics 
  falling 
  

   into 
  the 
  Mahton 
  below 
  Tautabeug, 
  several 
  miles 
  above 
  Choung-kwa. 
  

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