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  THEOBALD 
  : 
  GEOLOGY 
  OP 
  PEGU. 
  

  

  We 
  now 
  approach 
  the 
  second 
  area 
  of 
  serpentine 
  outbursts, 
  present- 
  

   ing 
  three 
  distinct 
  foci 
  of 
  activity, 
  though 
  all 
  ranged 
  in 
  close 
  proximity 
  

   to 
  the 
  Axial 
  boundary, 
  and 
  in 
  part 
  coinciding 
  with 
  it. 
  The 
  first 
  and 
  

   most 
  remarkable 
  display 
  of 
  this 
  rock 
  is 
  seen 
  just 
  above 
  the 
  village 
  of 
  

   Letpangon 
  on 
  the 
  Maday. 
  A 
  wall 
  of 
  serpentine 
  here 
  crosses 
  the 
  stream 
  

   and 
  appears 
  to 
  divide 
  the 
  Axial 
  from 
  the 
  Nummulitic 
  group. 
  In 
  the 
  

   Axials, 
  above 
  the 
  dyke 
  (if 
  such 
  is 
  its 
  nature), 
  the 
  utmost 
  confusion 
  and 
  

   alteration 
  exists, 
  especially 
  a 
  little 
  way 
  up 
  the 
  stream, 
  where 
  some 
  lime- 
  

   stone 
  occurs, 
  which 
  is 
  doubtless 
  the 
  Triassic 
  limestone 
  (b), 
  but 
  so 
  altered 
  

   as 
  to 
  present 
  no 
  trace 
  of 
  any 
  organisms 
  whatever. 
  Below 
  the 
  dyke 
  and 
  

   along 
  the 
  boundary, 
  the 
  utmost 
  mechanical 
  disturbance 
  prevails 
  among 
  

   the 
  newer 
  strata, 
  but 
  nothing 
  like 
  the 
  alteration 
  seen 
  among 
  the 
  

   Axials, 
  and 
  it 
  seems 
  clear 
  that 
  whilst 
  the 
  action 
  of 
  the 
  serpentine 
  

   on 
  the 
  Axials 
  caused 
  or 
  coincided 
  with 
  a 
  notable 
  amount 
  of 
  metamor- 
  

   phism 
  among 
  them, 
  the 
  action 
  of 
  the 
  serpentine 
  on 
  the 
  Nummuli- 
  

   tics 
  was 
  almost 
  purely 
  mechanical 
  in 
  character 
  and 
  its 
  effects. 
  This 
  

   s 
  wall/ 
  as 
  I 
  have 
  termed 
  it, 
  has 
  every 
  appearance 
  of 
  being 
  a 
  dyke 
  

   stretching 
  on 
  either 
  side 
  of 
  the 
  Maday, 
  for 
  about 
  five 
  miles 
  in 
  extreme 
  

   length, 
  but 
  nowhere 
  exceeding 
  a 
  quarter 
  of 
  a 
  mile 
  in 
  breadth, 
  and 
  in 
  

   some 
  places 
  south 
  of 
  Letpangon 
  not 
  attaining 
  more 
  than 
  one 
  hundred 
  and 
  

   fifty 
  yards, 
  if 
  so 
  much, 
  where 
  steeply 
  scarped 
  by 
  a 
  small 
  feeder 
  falling 
  into 
  

   the 
  Maday 
  stream 
  just 
  above 
  it. 
  It 
  runs 
  in 
  a 
  slightly 
  curved 
  line, 
  and 
  at 
  

   either 
  end 
  terminates 
  abruptly 
  without 
  any 
  indication 
  of 
  further 
  continu- 
  

   ance. 
  The 
  next 
  stretch 
  of 
  serpentine 
  comes 
  in 
  some 
  four 
  miles 
  further 
  

   South, 
  forming 
  a 
  hilly 
  inaccessible 
  tract 
  of 
  country, 
  of 
  which 
  the 
  peak 
  of 
  

   Shynbaiahn-toung 
  marks 
  the 
  termination 
  to 
  the 
  North, 
  and 
  the 
  higher 
  

   and 
  more 
  conspicuous 
  peak 
  of 
  Nattoung, 
  the 
  termination 
  to 
  the 
  South. 
  

   Shynbaiahn-toung 
  is 
  reached 
  up 
  the 
  Alaychong 
  stream 
  in 
  which 
  the 
  

   usual 
  upper 
  Axial 
  beds 
  are 
  met 
  with, 
  and 
  the 
  Axial 
  limestone, 
  in 
  parts 
  

   altered 
  and 
  even 
  converted 
  into 
  a 
  white 
  crystalline 
  marble. 
  Shynbaiahn 
  

  

  hill 
  consists 
  wholly 
  of 
  serpentine, 
  with 
  much 
  steatite 
  in 
  the 
  shaly 
  beds 
  

   ( 
  334 
  ) 
  

  

  