﻿114 
  THEOBALD 
  : 
  GEOLOGY 
  OF 
  PEGU. 
  

  

  The 
  following' 
  sketch 
  of 
  the 
  beds 
  seen 
  in 
  crossing 
  the 
  Arakais 
  

   range 
  from 
  East 
  to 
  West 
  between 
  Nyoung-ben-thah, 
  in 
  the 
  Kyouk- 
  

   khyoung-gyee 
  district, 
  and 
  Yay-pot, 
  on 
  a 
  feeder 
  of 
  the 
  Gwah 
  (Khwa) 
  

   stream, 
  will 
  illustrate 
  the 
  general 
  character 
  of 
  the 
  present 
  group; 
  

   but 
  unfortunately, 
  from 
  the 
  entire 
  absence 
  of 
  fossils 
  or 
  highly 
  charac- 
  

   teristic 
  beds, 
  there 
  is 
  no 
  means 
  of 
  collating 
  one 
  section 
  with 
  another, 
  

   or 
  of 
  grouping 
  satisfactorily 
  the 
  beds 
  seen 
  in 
  them 
  : 
  — 
  When 
  well 
  within 
  

   the 
  hills, 
  proceeding 
  in 
  a 
  Westerly 
  direction, 
  the 
  first 
  rocks 
  passed 
  

   over 
  in 
  descending 
  order 
  are 
  blue 
  slaty 
  shales 
  of 
  great 
  thickness, 
  with 
  

   a 
  dip 
  to 
  the 
  East. 
  These 
  shales 
  are 
  soft 
  and 
  silky, 
  and 
  contain 
  numerous 
  

   beds 
  of 
  blue 
  limestone 
  varying 
  from 
  a 
  few 
  inches 
  to 
  a 
  few 
  feet 
  in 
  thick- 
  

   ness. 
  This 
  limestone 
  is 
  fine-grained 
  and 
  sub-crystalline, 
  breaking 
  with 
  a 
  

   conchoidal 
  fracture, 
  blue 
  on 
  its 
  freshly 
  broken 
  surface, 
  but 
  weathering 
  

   to 
  a 
  pale 
  yellow 
  or 
  nankeen 
  color. 
  It 
  is 
  rather 
  silicious 
  and 
  hardened, 
  

   and 
  though 
  a 
  very 
  promising-looking 
  rock 
  for 
  fossils, 
  a 
  close 
  search 
  failed 
  

   to 
  discover 
  any 
  traces 
  whatever 
  of 
  organic 
  remains 
  in 
  it. 
  About 
  the 
  

   same 
  horizon, 
  only 
  farther 
  to 
  the 
  North, 
  I 
  noticed 
  beds 
  of 
  flinty 
  

   limestone, 
  of 
  lithographic 
  aspect, 
  which 
  seemed 
  equally 
  devoid 
  of 
  organic 
  

   remains. 
  

  

  After 
  passing 
  these 
  shales 
  with 
  limestone, 
  and 
  descending 
  a 
  spur 
  into 
  

   the 
  Kappong 
  stream, 
  but 
  still 
  on 
  the 
  East 
  side 
  of 
  the 
  range, 
  we 
  come 
  

   on 
  a 
  group 
  of 
  coarse 
  thick-bedded 
  silicious 
  sandstones, 
  with 
  harsh 
  silicious 
  

   or 
  jaspery 
  shales, 
  and 
  thin-bedded 
  silicious 
  sandstones 
  intermixed. 
  The 
  

   whole 
  of 
  these 
  beds 
  are 
  intensely 
  hardened 
  and 
  silicified. 
  One 
  very 
  

   thick 
  bed 
  has 
  a 
  peculiar 
  appearance 
  from 
  containing 
  irregularly 
  shaped 
  

   earthy 
  portions, 
  which 
  decay 
  and 
  leave 
  great 
  angular 
  hollows 
  three 
  or 
  

   four 
  inches 
  across. 
  Some 
  dark 
  blue 
  thin-bedded 
  slaty 
  shale 
  also 
  occurs, 
  

   associated 
  subordinately 
  with 
  the 
  silicious 
  beds, 
  as 
  though 
  here 
  fore- 
  

   shadowing 
  the 
  approaching 
  deposition 
  of 
  similar 
  shales 
  in 
  much 
  greater 
  

   force, 
  which 
  are 
  seen, 
  as 
  above 
  mentioned, 
  to 
  overlie 
  these 
  silicious 
  beds. 
  

  

  After 
  leaving 
  these 
  silicious 
  beds, 
  no 
  very 
  clear 
  section 
  is 
  seen. 
  The 
  dip 
  

   ( 
  302 
  ) 
  

  

  