﻿TEIASSIC 
  GROUP. 
  135 
  

  

  The 
  really 
  characteristic 
  portion 
  of 
  the 
  group 
  is 
  that 
  embraced 
  in 
  

   sub-divisions 
  a, 
  b, 
  and 
  c. 
  

  

  a. 
  — 
  These 
  shales 
  are 
  exposed 
  just 
  below 
  the 
  mouth 
  of 
  the 
  Thayet 
  

   stream, 
  a 
  small 
  feeder 
  of 
  the 
  Hlowa, 
  and 
  are 
  here 
  characterised 
  by 
  a 
  

   species 
  of 
  Cardita 
  which 
  is 
  not 
  rare 
  in 
  them, 
  and 
  not 
  unfrequently 
  presents 
  

   both 
  valves 
  united. 
  A 
  few 
  small 
  gasteropods 
  are 
  also 
  present, 
  but 
  

   Dr. 
  Stoliczka 
  has 
  been 
  unable 
  to 
  specifically 
  determine 
  any 
  of 
  them 
  ; 
  

   neither 
  have 
  these 
  fossils 
  been 
  noticed 
  elsewhere. 
  

  

  b. 
  — 
  This 
  bed 
  I 
  have 
  termed 
  the 
  Halobia 
  limestone, 
  though 
  at 
  this 
  

   particular 
  point 
  it 
  does 
  not 
  contain 
  that 
  fossil 
  ; 
  but 
  I 
  have 
  little 
  doubt 
  

   that 
  it 
  is 
  one 
  and 
  the 
  same 
  bed. 
  The 
  limestone 
  here 
  seen 
  is 
  a 
  mixed 
  

   rock, 
  partly 
  shale 
  and 
  conglomerate 
  and 
  partly 
  a 
  rubbly 
  limestone. 
  It 
  

   contains 
  here 
  a 
  species 
  of 
  echinoderm, 
  though 
  not 
  in 
  a 
  condition 
  to 
  be 
  

   identified, 
  and 
  it 
  is 
  the 
  presence 
  of 
  this 
  fossil 
  elsewhere 
  which 
  helps 
  to 
  

   identify 
  this 
  rather 
  variable 
  bed. 
  In 
  the 
  small 
  stream 
  near 
  the 
  Than-ni 
  

   stream, 
  almost 
  where 
  this 
  group 
  ceases 
  out, 
  a 
  thickish 
  bed 
  of 
  grey 
  lime- 
  

   stone 
  occurs, 
  which 
  may 
  be 
  identified 
  with 
  bed 
  b 
  of 
  the 
  Hlowa 
  section 
  by 
  

   the 
  occurrence 
  in 
  it 
  of 
  numerous 
  specimens 
  of 
  the 
  same 
  echinoderm, 
  but 
  

   not 
  sufficiently 
  well 
  preserved 
  for 
  specific 
  identification. 
  This 
  is 
  the 
  same 
  

   limestone 
  which 
  I 
  have 
  described 
  as 
  found 
  between 
  Kon-ding-zu 
  and 
  

   Khyoung-tha, 
  near 
  the 
  frontier, 
  and 
  though 
  it 
  would 
  seem 
  to 
  vary 
  

   much 
  in 
  mineral 
  character, 
  it 
  may 
  generally 
  be 
  found 
  where 
  this 
  upper 
  

   division 
  of 
  the 
  group 
  is 
  well 
  exposed. 
  North 
  of 
  Nattoung, 
  and 
  some 
  

   one 
  and 
  a 
  half 
  miles 
  South-west 
  from 
  Thabie-gaing, 
  a 
  small 
  outcrop 
  of 
  

   what 
  I 
  take 
  to 
  be 
  this 
  limestone 
  is 
  seen 
  on 
  the 
  crest 
  of 
  a 
  low 
  hill 
  in 
  

   which 
  a 
  few 
  specimens 
  were 
  obtained 
  of 
  a 
  shell 
  which 
  Dr. 
  Stoliczka 
  con- 
  

   siders 
  to 
  be 
  Halobia 
  Lommeli, 
  a 
  characteristic 
  fossil 
  of 
  the 
  Triassic 
  group 
  in 
  

   the 
  Himalayas 
  of 
  Spiti. 
  In 
  the 
  Pyagyee, 
  a 
  small 
  feeder 
  of 
  the 
  Maday 
  

   river, 
  this 
  limestone 
  is 
  seen, 
  of 
  various 
  tints 
  of 
  pink 
  and 
  yellow, 
  and 
  occa- 
  

   sionally 
  converted 
  into 
  a 
  white 
  crystalline 
  rock, 
  which 
  change 
  is 
  probably 
  

   induced 
  by 
  the 
  near 
  proximity 
  of 
  the 
  large 
  mass 
  of 
  serpentine 
  of 
  Shyn- 
  

  

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  323 
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