﻿90 
  THEOBALD 
  : 
  GEOLOGY 
  OF 
  PEGU. 
  

  

  the 
  existence 
  of 
  this 
  isolated 
  patch 
  of 
  rocks, 
  by 
  no 
  means 
  hard 
  or 
  espe** 
  

   cially 
  adapted 
  to 
  resist 
  denudation. 
  On 
  the 
  mainland 
  they 
  are 
  entirely 
  

   isolated 
  by 
  a 
  low 
  swampy 
  channel, 
  running- 
  into 
  the 
  Ngayot 
  creek. 
  

   Just 
  opposite 
  the 
  northern 
  extremity 
  of 
  Koranji 
  island 
  some 
  beds 
  of 
  

   earthy 
  bluish 
  sandstone 
  come 
  in 
  vertically 
  along" 
  the 
  shore, 
  seeming 
  

   to 
  underlie 
  the 
  other 
  rocks, 
  and 
  containing 
  a 
  few 
  ill-preserved 
  fossils, 
  

   Area, 
  Cardium, 
  &c. 
  On 
  the 
  mainland, 
  a 
  large 
  Carcharodon 
  tooth 
  was 
  

   picked 
  up, 
  seemingly 
  derived 
  from 
  the 
  earthy 
  limestone, 
  and 
  which 
  much 
  

   resembled 
  a 
  tooth 
  I 
  found 
  in 
  the 
  sandstones 
  six 
  miles 
  below 
  Thayetmio 
  

   on 
  the 
  opposite 
  bank 
  of 
  the 
  river, 
  and 
  which 
  would 
  seem 
  to 
  be 
  high 
  

   in 
  the 
  Miocene 
  group. 
  Small 
  squaline 
  teeth 
  are 
  numerous 
  throughout 
  

   the 
  upper 
  portion 
  of 
  the 
  Miocene 
  group, 
  and 
  in 
  the 
  basal 
  members 
  of 
  

   the 
  fossil- 
  wood 
  sands, 
  but 
  I 
  have 
  only 
  seen 
  two 
  specimens 
  of 
  this 
  large 
  

   CJtarcharodon 
  (some 
  two 
  inches 
  long), 
  which 
  must 
  consequently 
  be 
  some- 
  

   what 
  rare. 
  

  

  At 
  the 
  mouth 
  of 
  the 
  Nga-yot 
  creek, 
  small 
  shark's 
  teeth 
  are 
  not 
  

   rare 
  ; 
  and 
  from 
  the 
  same 
  earthy 
  calcareous 
  beds 
  I 
  obtained 
  two 
  conical 
  

   fish 
  teeth, 
  some 
  fragmentary 
  crustacean 
  claws, 
  and 
  the 
  ossicles 
  (palatal 
  

   or 
  dermal) 
  of 
  some 
  species 
  of 
  Ray. 
  On 
  Koranji 
  island 
  I 
  procured 
  a 
  

   small 
  reptilian 
  tooth, 
  with 
  cultrate-edges, 
  smooth, 
  and 
  mottled 
  yellow 
  

   longitudinally. 
  Fossils 
  are, 
  however, 
  very 
  scarce 
  save 
  the 
  two 
  echino- 
  

   derms 
  abovenamed; 
  and 
  in 
  places 
  a 
  small 
  foraminifer 
  which 
  accom- 
  

   panies 
  them. 
  I 
  shall 
  allude 
  elsewhere 
  to 
  this 
  calcareous 
  rock, 
  which 
  is 
  

   well 
  suited 
  for 
  economic 
  purposes, 
  though 
  rather 
  out 
  of 
  the 
  way 
  as 
  

   regards 
  its 
  geographical 
  position. 
  

  

  VIII. 
  — 
  The 
  Nummulitic 
  or 
  Eocene 
  Geoup. 
  

  

  This 
  important 
  group 
  is 
  largely 
  developed 
  in 
  Pegu, 
  extending 
  from 
  

   the 
  frontier, 
  to 
  Pooriam 
  point, 
  a 
  rocky 
  spit 
  running 
  into 
  the 
  sea 
  at 
  the 
  

   mouth 
  of 
  the 
  Bassein 
  river, 
  the 
  most 
  westerly 
  branch 
  of 
  the 
  delta 
  of 
  

   the 
  Irrawadi. 
  Within 
  the 
  limits 
  of 
  Pegu, 
  this 
  group 
  is 
  confined 
  as 
  far 
  as 
  

  

  ( 
  *78 
  ) 
  

  

  