﻿130 
  THEOBALD 
  : 
  GEOLOGY 
  OE 
  PEGU. 
  

  

  croup),, 
  the 
  lower 
  beds 
  of 
  which 
  are 
  very 
  probably 
  of 
  Cretaceous 
  age, 
  and 
  

   on 
  which, 
  on 
  the 
  Eastward, 
  unaltered 
  or 
  generally 
  unaltered 
  Nummulitic 
  

   strata 
  repose. 
  These 
  Eocene 
  strata 
  are 
  not 
  recognisable 
  on 
  the 
  Western 
  

   side 
  of 
  the 
  Arakan 
  range 
  towards 
  its 
  extremity, 
  being 
  there 
  either 
  

   denuded 
  or 
  included 
  within 
  the 
  higher 
  portion 
  of 
  the 
  Negrais 
  group 
  ; 
  but 
  

   where 
  the 
  alteration 
  appears 
  to 
  have 
  been 
  less 
  felt, 
  the 
  highest 
  bed 
  of 
  the 
  

   group 
  and 
  its 
  most 
  characteristic 
  one, 
  the 
  Nummulitic 
  limestone, 
  occurs, 
  

   near 
  Kyeantalee, 
  and 
  presumably 
  at 
  other 
  spots 
  in 
  the 
  position 
  which 
  

   would 
  prima 
  facie 
  be 
  assigned 
  it, 
  away 
  from 
  the 
  main 
  range, 
  on 
  the 
  coast. 
  

   Every 
  section, 
  then, 
  across 
  the 
  range 
  South 
  of 
  the 
  Than-ni 
  stream 
  may 
  be 
  

   considered 
  identical 
  in 
  respect 
  to 
  its 
  broader 
  geological 
  features. 
  North 
  

   of 
  the 
  Than-ni 
  stream 
  it 
  is 
  very 
  different. 
  The 
  Axials 
  here 
  come 
  in 
  as 
  a 
  

   tongue-shaped 
  promontory 
  wedged 
  among 
  the 
  newer 
  groups. 
  On 
  the 
  

   East 
  the 
  Axials 
  are 
  in 
  immediate 
  contact 
  with 
  Nummulitics, 
  the 
  beds 
  of 
  

   both 
  groups 
  standing 
  at 
  a 
  high 
  angle. 
  On 
  the 
  West 
  in 
  place 
  of 
  Nummu- 
  

   litics 
  there 
  is 
  a 
  great 
  thickness 
  of 
  rocks 
  of 
  undoubtedly 
  Cretaceous 
  age, 
  

   some 
  of 
  them 
  perhaps 
  older, 
  with, 
  it 
  may 
  be 
  presumed, 
  Eocene 
  rocks 
  above 
  

   them, 
  but 
  far 
  to 
  the 
  Westward, 
  beyond 
  the 
  scope 
  of 
  my 
  present 
  remarks. 
  

   Another 
  point 
  which 
  I 
  would 
  prominently 
  bring 
  forward 
  is, 
  that 
  this 
  

   spit 
  of 
  Axial 
  roeks 
  is 
  not 
  coincident 
  in 
  its 
  direction 
  with 
  the 
  axis 
  of 
  the 
  

   range. 
  The 
  Western 
  boundary 
  of 
  these 
  Axials 
  is 
  not 
  so 
  closely 
  known 
  

   as 
  regards 
  its 
  details, 
  owing 
  to 
  the 
  difficulties 
  of 
  the 
  ground, 
  as 
  is 
  

   desirable, 
  but 
  it 
  is 
  certain, 
  that 
  after 
  impinging 
  on 
  the 
  Than-ni 
  stream 
  

   it 
  sharply 
  recedes 
  along 
  the 
  watershed 
  which 
  separates 
  the 
  Than-ni 
  and 
  

   Maday 
  streams. 
  Whilst, 
  therefore, 
  the 
  Axial 
  group 
  occupies 
  the 
  axis 
  of 
  

   the 
  range 
  at 
  the 
  frontier, 
  these 
  beds 
  do 
  not 
  to 
  the 
  South 
  coincide 
  with 
  

   the 
  axis 
  of 
  the 
  range, 
  but 
  run 
  down 
  obliquely 
  from 
  it 
  till 
  they 
  cease 
  out 
  

   altogether 
  at 
  the 
  Nummulitic 
  boundary, 
  which 
  keeps 
  well 
  to 
  the 
  outer 
  

   hills. 
  Weighing, 
  then, 
  the 
  fact 
  of 
  the 
  Axials 
  being 
  juxta-posed 
  on 
  either 
  

   side 
  of 
  the 
  range 
  to 
  such 
  different 
  rocks, 
  and 
  the 
  oblique 
  arrangement 
  of 
  

   the 
  axis 
  of 
  the 
  area 
  of 
  that 
  group 
  to 
  that 
  of 
  the 
  range, 
  and 
  having 
  in 
  

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