﻿ECONOMIC 
  GEOLOGY. 
  161 
  

  

  the 
  shaft, 
  which 
  is 
  put 
  down 
  just 
  above 
  it. 
  Above 
  the 
  shaft, 
  the 
  shales 
  

   are 
  seen 
  saturated 
  with 
  petroleum 
  in 
  their 
  joints 
  and 
  cracks. 
  The 
  

   arrangement 
  of 
  the 
  ground 
  and 
  the 
  position 
  of 
  the 
  shaft 
  will 
  be 
  at 
  once 
  

   seen 
  by 
  a 
  reference 
  to 
  Plate 
  II. 
  

  

  The 
  shales 
  here 
  contain 
  fossils 
  of 
  the 
  ordinary 
  Miocene 
  types, 
  

   Ostrea, 
  Pecten 
  (2 
  species), 
  Conns, 
  Cyprcea, 
  Area, 
  Solen, 
  Turritetta, 
  crabs' 
  

   claws, 
  sharks' 
  teeth, 
  &c. 
  

  

  From 
  this 
  locality 
  a 
  little 
  petroleum 
  has 
  been 
  obtained, 
  and 
  from 
  

   the 
  evidence 
  of 
  its 
  existence 
  in 
  other 
  spots 
  as 
  well, 
  in 
  the 
  neighbourhood, 
  

   it 
  is 
  possible 
  that 
  it 
  may 
  be 
  obtained 
  here 
  in 
  profitable 
  quantities. 
  At 
  

   the 
  same 
  time 
  the 
  geological 
  horizon 
  of 
  these 
  beds 
  is 
  probably 
  not 
  

   less 
  than 
  2,000 
  feet 
  above 
  the 
  source 
  of 
  the 
  oil, 
  and 
  that 
  thickness 
  of 
  

   beds 
  interposed, 
  would 
  seem 
  an 
  unfavorable 
  circumstance 
  as 
  regards 
  

   an 
  abundant 
  supply. 
  

  

  The 
  last 
  locality 
  I 
  shall 
  notice 
  is 
  by 
  far 
  the 
  most 
  promising 
  in 
  an 
  

   economic 
  aspect. 
  It 
  is 
  situated 
  within 
  the 
  area 
  of 
  the 
  Nummulitic 
  

   group, 
  being 
  eleven 
  and 
  a 
  half 
  miles 
  due 
  West 
  from 
  Prome 
  Pagoda, 
  and 
  

   three 
  miles 
  above 
  the 
  village 
  of 
  Toungboji, 
  on 
  a 
  small 
  stream 
  falling 
  

   into 
  the 
  Booyoo 
  stream, 
  which 
  though 
  unnamed 
  in 
  the 
  map 
  is 
  locally 
  

   known 
  as 
  the 
  Mahn-choung. 
  A 
  dam 
  is 
  thrown 
  across 
  this 
  small 
  stream 
  

   for 
  the 
  purpose 
  of 
  storing 
  water 
  at 
  Toungboji, 
  and 
  the 
  existence 
  of 
  

   petroleum 
  would 
  seem 
  to 
  have 
  been 
  discovered 
  in 
  the 
  usual 
  way 
  by 
  its 
  

   contaminating 
  the 
  water 
  of 
  the 
  Mahn-choung 
  in 
  the 
  dry 
  season. 
  

  

  At 
  the 
  time 
  of 
  my 
  visit 
  in 
  November 
  1871, 
  four 
  shafts 
  had 
  been 
  

   sunk 
  in 
  the 
  bed 
  of 
  the 
  Mahn, 
  one 
  of 
  which 
  had 
  been 
  buried 
  by 
  a 
  slip 
  of 
  

   earth 
  from 
  the 
  hill 
  side 
  adjoining 
  the 
  stream, 
  and 
  two 
  of 
  the 
  others 
  had 
  

   not 
  struck 
  any 
  petroleum. 
  The 
  second 
  shaft, 
  however^ 
  which 
  is 
  the 
  only 
  

   one 
  that 
  needs 
  attention, 
  had 
  been 
  very 
  successful 
  and 
  had 
  yielded 
  some 
  

   two 
  and 
  a 
  half 
  viss 
  of 
  oil 
  daily 
  at 
  the 
  depth 
  of 
  35 
  cubits, 
  till 
  it 
  became 
  

   filled 
  with 
  water 
  in 
  the 
  rains, 
  when 
  the 
  supply 
  ceased. 
  In 
  my 
  memoran- 
  

   dum 
  on 
  this 
  well 
  at 
  the 
  time 
  I 
  attributed 
  this 
  cessation 
  of 
  the 
  flow 
  of 
  oil 
  

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