﻿128 
  THEOBALD: 
  GEOLOGY 
  OF 
  PEGU. 
  

  

  understood 
  as'metamorphism, 
  though 
  locally 
  the 
  process 
  has 
  gone 
  further 
  

   and 
  produced 
  true 
  metamorphic 
  schists; 
  and 
  this 
  would 
  seem 
  to 
  be 
  

   confined 
  to 
  the 
  immediate 
  vicinity 
  of 
  the 
  largest 
  display 
  of 
  serpentine 
  

   associated 
  with 
  this 
  group. 
  The 
  Axials 
  occupy 
  a 
  well-defined 
  area, 
  and 
  

   constitute 
  the 
  central 
  core 
  or 
  axis 
  of 
  the 
  Arakan 
  range 
  towards 
  the 
  

   frontier. 
  On 
  the 
  frontier 
  they 
  form 
  a 
  broad, 
  regular 
  tract 
  of 
  country, 
  

   which, 
  measured 
  at 
  right 
  angles 
  from 
  the 
  crest 
  of 
  the 
  range, 
  is 
  a 
  little 
  

   over 
  twelve 
  miles 
  in 
  breadth 
  on 
  the 
  Eastern 
  or 
  Pegu 
  side 
  of 
  the 
  range, 
  or 
  

   fifteen 
  miles 
  measured 
  in 
  an 
  East 
  and 
  West 
  direction 
  along 
  the 
  frontier 
  

   line. 
  The 
  entire 
  width 
  of 
  the 
  group 
  here 
  cannot 
  be 
  fixed, 
  as 
  the 
  boundary 
  

   has 
  not 
  been 
  examined 
  on 
  the 
  Western 
  side 
  of 
  the 
  range, 
  but 
  from 
  the 
  

   proportion 
  of 
  pebbles 
  of 
  this 
  group 
  in 
  the 
  bed 
  of 
  the 
  Mai-i 
  river 
  above 
  

   Lyndi, 
  I 
  am 
  inclined 
  to 
  think 
  that 
  the 
  Western 
  boundary 
  will 
  be 
  

   found 
  to 
  coincide 
  generally 
  with 
  the 
  valley 
  of 
  the 
  Gamon 
  stream, 
  — 
  an 
  

   important 
  tributary 
  of 
  the 
  Mai-i 
  river, 
  and 
  that 
  the 
  entire 
  breadth 
  will 
  

   probably 
  be 
  found 
  not 
  to 
  exceed 
  twenty 
  miles. 
  From 
  the 
  frontier 
  the 
  group 
  

   extends 
  South 
  as 
  far 
  as 
  the 
  Than-ni 
  stream, 
  a 
  distance 
  a 
  little 
  short 
  of 
  

   flftv 
  miles, 
  but 
  is 
  nowhere 
  known 
  to 
  occur 
  South 
  of 
  that 
  stream. 
  The 
  

   impracticable 
  nature 
  of 
  the 
  ground 
  is 
  such 
  as 
  to 
  preclude 
  any 
  close 
  

   acquaintance 
  with 
  the 
  rocks 
  along 
  their 
  Western 
  boundary, 
  but 
  to 
  the 
  

   Eastward 
  I 
  regard 
  this 
  group 
  as 
  faulted 
  against 
  the 
  Nummulitics, 
  the 
  

   fault 
  dyino- 
  out 
  or 
  disappearing 
  to 
  the 
  South, 
  together 
  with 
  the 
  Axials 
  

   themselves, 
  beneath 
  the 
  disturbed 
  beds 
  of 
  the 
  Negrais 
  group. 
  In 
  this 
  

   view 
  the 
  Axials 
  form 
  a 
  wedge 
  of 
  strata, 
  which 
  though 
  governed 
  by 
  the 
  

   same 
  forces 
  which 
  have 
  produced 
  the 
  chain 
  of 
  Arakan 
  hills, 
  as 
  previously 
  

   described, 
  yet 
  have 
  been 
  also 
  brought 
  up 
  by 
  a 
  fault 
  through 
  the 
  newer 
  

   strata, 
  through 
  the 
  effects 
  of 
  which 
  they 
  have 
  become 
  juxta-posed 
  to 
  the 
  

   Nummulitics 
  on 
  the 
  East, 
  to 
  the 
  exclusion 
  of 
  the 
  Negrais 
  or 
  Cretaceous 
  

   beds 
  met 
  with 
  to 
  the 
  South 
  and 
  West 
  ; 
  and 
  to 
  this 
  element 
  of 
  upheaval, 
  

   through, 
  faulting, 
  superadded 
  to 
  that 
  general 
  process 
  and 
  method 
  of 
  

   upheaval 
  wherein 
  the 
  entire 
  range 
  has 
  originated, 
  the 
  greater 
  elevation 
  

   of 
  the 
  hills 
  towards 
  the 
  frontier 
  is 
  probably 
  due. 
  I 
  am 
  aware 
  of 
  the 
  

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