﻿116 
  THEOBALD: 
  GEOLOGY 
  OF 
  PEGU. 
  

  

  Section 
  near 
  Matha 
  (ascending). 
  The 
  beds 
  veer 
  round 
  from 
  15° 
  to 
  

   South-by-west, 
  to 
  45° 
  to 
  West-by-south. 
  

  

  1. 
  Dark 
  arenaceous 
  shales, 
  with 
  faint 
  carbonaceous 
  markings 
  

  

  and 
  stringy 
  beds 
  of 
  sandstone 
  much 
  contorted 
  and 
  

   squeezed 
  about 
  ... 
  ... 
  ... 
  ... 
  300 
  

  

  2. 
  Harsh 
  thin-bedded 
  sandstones 
  in 
  one 
  and 
  two 
  inch 
  beds, 
  

  

  with 
  shaly 
  partings 
  and 
  a 
  few 
  beds 
  five 
  and 
  seven 
  inches 
  

  

  thick 
  ... 
  ... 
  ... 
  ... 
  85 
  

  

  3. 
  Beds 
  similar 
  to 
  the 
  above, 
  but 
  one 
  and 
  two 
  feet 
  beds 
  pre- 
  

  

  dominating 
  ... 
  ... 
  ,. 
  a 
  ... 
  23 
  

  

  4. 
  Very 
  thin-bedded 
  sandstones 
  not 
  averaging 
  half 
  an 
  incn, 
  

  

  with 
  a 
  few 
  one 
  and 
  two 
  inch 
  beds, 
  interspersed 
  ... 
  69 
  

  

  5. 
  Thicker 
  bedded 
  sandstones 
  in 
  from 
  nine 
  to 
  twenty 
  inch 
  beds 
  52 
  

  

  6. 
  Similar 
  to 
  the 
  last, 
  but 
  thinner 
  bedded 
  ... 
  ... 
  49 
  

  

  7. 
  Thin-bedded 
  shaly 
  sandstones 
  ... 
  ... 
  ... 
  99 
  

  

  8. 
  Thicker 
  bedded 
  sandstones 
  in 
  from 
  nine 
  to 
  twelve 
  inch 
  beds 
  46 
  

  

  9. 
  Thin 
  shaly 
  beds 
  ... 
  ... 
  ... 
  ... 
  30 
  

  

  753 
  

  

  The 
  section 
  here 
  becomes 
  confused, 
  but 
  thick 
  beds 
  of 
  sandstone 
  come 
  in, 
  

   which 
  seem 
  identical 
  with 
  the 
  sandstones 
  commonly 
  seen 
  along 
  the 
  

   coast, 
  and 
  which 
  I 
  will 
  now 
  describe. 
  Along 
  most 
  parts 
  of 
  the 
  Arakan 
  

   coast, 
  from 
  Negrais 
  upwards, 
  a 
  group 
  of 
  sandstones 
  occurs, 
  thin 
  bedded 
  

   and 
  massive, 
  but 
  presenting 
  no 
  very 
  prominent 
  mineral 
  character, 
  or 
  

   affording 
  any 
  fossil. 
  These 
  sandstones 
  are 
  very 
  little 
  altered, 
  generally 
  

   not 
  at 
  all, 
  and 
  usually 
  dip 
  at 
  moderate 
  angles 
  and 
  with 
  much 
  less 
  show 
  

   of 
  disturbance 
  than 
  other 
  and 
  older 
  beds 
  along 
  the 
  coast. 
  It 
  was 
  such 
  

   considerations 
  as 
  these 
  which 
  induced 
  me 
  at 
  first 
  to 
  consider 
  them 
  

   as 
  basal 
  members 
  of 
  the 
  Nummulitic 
  group, 
  and 
  though 
  I 
  now 
  include 
  

   them 
  among 
  the 
  Negrais 
  rocks, 
  I 
  do 
  so 
  more 
  from 
  the 
  absence 
  of 
  any 
  

   satisfactory 
  means 
  of 
  determining 
  their 
  age, 
  than 
  from 
  any 
  evidence 
  that 
  

   the 
  position 
  at 
  first 
  assigned 
  them 
  was 
  incorrect. 
  Obviously, 
  however, 
  

   in 
  a 
  case 
  of 
  doubt, 
  it 
  is 
  better 
  to 
  include 
  them 
  in 
  a 
  group 
  the 
  age 
  of 
  

   which 
  is 
  uncertain, 
  than 
  to 
  assign 
  them 
  a 
  position 
  in 
  a 
  well-defined 
  

   group, 
  to 
  which 
  though 
  they 
  may 
  belong, 
  there 
  is 
  no 
  direct 
  evidence 
  

   of 
  their 
  so 
  doing. 
  

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  304 
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