﻿TRIASSIC 
  GROUP. 
  127 
  

  

  "much 
  of 
  the 
  rock 
  being 
  quite 
  devoid 
  of 
  them. 
  On 
  decomposing-, 
  these 
  

   concretions 
  leave 
  holes 
  containing 
  a 
  little 
  powdery 
  oxide 
  of 
  iron, 
  and 
  

   impart 
  to 
  the 
  earthy 
  sandstone 
  the 
  aspect 
  of 
  an 
  amygdaloidal 
  trap 
  • 
  

   indeed, 
  the 
  deception 
  is 
  so 
  perfect 
  that 
  it 
  requires 
  a 
  careful 
  examination 
  

   of 
  the 
  bed 
  to 
  realise 
  that 
  it 
  is 
  a 
  simple 
  sedimentary 
  and 
  not 
  a 
  volcanic 
  

   rock. 
  At 
  several 
  spots 
  between 
  Kyeantalee 
  and 
  Mai-i 
  this 
  very 
  remarkable 
  

   rock 
  occurs, 
  and 
  though 
  seen 
  but 
  at 
  intervals 
  may, 
  from 
  its 
  very 
  marked 
  

   and 
  peculiar 
  character, 
  be 
  taken 
  as 
  conclusive 
  to 
  the 
  extension 
  over 
  the 
  

   above 
  country 
  of 
  the 
  Cretaceous 
  beds, 
  of 
  which, 
  I 
  believe, 
  it 
  is 
  a 
  member. 
  

   East 
  of 
  Mai-i 
  the 
  beds 
  of 
  this 
  group 
  attain 
  a 
  great 
  thickness, 
  though 
  

   some 
  of 
  them 
  may 
  belong 
  to 
  older 
  members 
  of 
  the 
  Secondary 
  series. 
  

   The 
  prevailing 
  dip 
  is 
  East-north-east, 
  and 
  the 
  rocks 
  are 
  mainly 
  hard, 
  massive 
  

   sandstones, 
  with 
  some 
  dark 
  shales 
  interspersed. 
  In 
  these 
  shales 
  in 
  some 
  

   places, 
  flat 
  concretions 
  of 
  limestone 
  occur, 
  both 
  blue 
  and 
  pale-o-ray, 
  rarely 
  

   more 
  than 
  six 
  inches 
  across, 
  and 
  from 
  one 
  to 
  two 
  inches 
  in 
  thickness. 
  

   In 
  none 
  of 
  these 
  beds 
  have 
  I 
  noticed 
  any 
  fossils, 
  though 
  I 
  somewhat 
  

   •carefully 
  examined 
  some 
  of 
  these 
  calciferous 
  shales 
  above 
  Lyndi 
  (Lyno--dee) 
  

   on 
  the 
  Mai-i 
  river, 
  where 
  they 
  seemed 
  to 
  promise 
  to 
  yield 
  some 
  sort 
  of 
  

   organism, 
  but 
  without 
  success. 
  

  

  XI. 
  — 
  Axial 
  (Triassic) 
  Group. 
  

  

  The 
  term 
  ' 
  Axials' 
  was 
  originally 
  proposed 
  by 
  me 
  for 
  the 
  group 
  of 
  

   altered 
  rocks 
  constituting 
  the 
  main 
  Arakan 
  range. 
  It 
  was, 
  however, 
  sub- 
  

   sequently 
  established 
  that 
  the 
  altered 
  rocks 
  so 
  designated 
  consisted 
  of 
  two 
  

   groups 
  of 
  very 
  different 
  ages, 
  — 
  an 
  oldeTr 
  group, 
  which 
  there 
  is 
  now 
  reason 
  

   to 
  know 
  is 
  o£ 
  Triassic 
  age, 
  to 
  which 
  the 
  term 
  Axial 
  is 
  now 
  restricted, 
  and 
  

   a 
  younger 
  group 
  of 
  beds, 
  not 
  improbably 
  of 
  Cretaceous 
  age, 
  or 
  younger, 
  

   to 
  which 
  I 
  have 
  applied 
  the 
  term 
  c 
  Negrais/ 
  as 
  already 
  described. 
  

  

  The 
  Axial 
  group, 
  as 
  now 
  restricted, 
  embraces 
  a 
  very 
  large 
  series 
  of 
  

   beds 
  of 
  very 
  varied 
  mineral 
  character, 
  most 
  of 
  which 
  have 
  undergone 
  a 
  

   certain 
  degree 
  of 
  alteration, 
  not 
  usually 
  amounting 
  to 
  what 
  is 
  generally 
  

  

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