﻿PEGU 
  GROUP. 
  

  

  83 
  

  

  separated 
  from 
  them 
  as 
  a 
  convenient 
  sub-division 
  ; 
  and 
  it 
  appears 
  that 
  this 
  

   group 
  in 
  like 
  manner 
  passes 
  conformably 
  up 
  into 
  the 
  fossil-wood 
  group, 
  

   though 
  it 
  may 
  prove 
  that 
  this 
  conformity 
  was 
  not 
  universal 
  and 
  that 
  in 
  

   some 
  parts 
  elevation 
  and 
  denudation 
  of 
  the 
  present 
  group 
  were 
  taking 
  

   place 
  simultaneously 
  with 
  the 
  regular 
  and 
  conformable 
  deposition 
  of 
  the 
  

   overlying 
  group 
  in 
  others. 
  I 
  have 
  named 
  these 
  beds 
  ' 
  Prome' 
  beds 
  from 
  

   the 
  fact 
  of 
  one 
  of 
  the 
  best 
  sections 
  I 
  am 
  acquainted 
  with 
  occurring 
  

   in 
  the 
  river 
  bank 
  opposite 
  and 
  above 
  Prome. 
  Of 
  these 
  I 
  here 
  give 
  

   a 
  section 
  in 
  ascending 
  order, 
  partly 
  measured 
  and 
  partly 
  estimated. 
  The 
  

   value 
  of 
  this 
  section, 
  however, 
  is 
  not 
  in 
  its 
  accuracy 
  of 
  detail, 
  as 
  the 
  

   oblique 
  angle 
  the 
  beds 
  form 
  with 
  the 
  river 
  is 
  greatly 
  opposed 
  to 
  correct 
  

   measurements 
  or 
  to 
  minute 
  details 
  respecting 
  the 
  beds 
  comprised 
  by 
  it, 
  

   and 
  the 
  ground 
  is 
  not 
  favorable 
  for 
  such, 
  but 
  in 
  the 
  great 
  thickness 
  of 
  

   beds 
  which 
  are 
  here 
  seen 
  superimposed 
  on 
  the 
  Sitsyahn 
  shales, 
  and 
  the 
  

   general 
  position 
  in 
  the 
  series 
  which 
  the 
  beds 
  themselves 
  hold. 
  Though 
  

   many 
  beds 
  of 
  this 
  group 
  are 
  fossiliferous, 
  yet 
  there 
  is 
  great 
  difficulty 
  in 
  

   comparing 
  sections 
  at 
  distant 
  points 
  from 
  the 
  absence 
  of 
  beds 
  comprising 
  

   characteristic 
  fossils 
  ; 
  but 
  this 
  section 
  is 
  of 
  use 
  so 
  far, 
  in 
  enabling 
  us 
  to 
  

   fix 
  the 
  general 
  position 
  in 
  the 
  series 
  of 
  such 
  fossiliferous 
  beds 
  as 
  those 
  

   opposite 
  Prome, 
  or 
  such 
  non-fossiliferous 
  ones 
  as 
  the 
  Sitsyahn 
  shale. 
  

  

  Above 
  the 
  Sitsyahn 
  shale 
  then, 
  in 
  conformable 
  and 
  ascending 
  order, 
  

   we 
  have 
  the 
  following 
  section 
  of 
  beds 
  which 
  I 
  group 
  into 
  an 
  upper 
  (b) 
  

   and 
  a 
  lower 
  (a) 
  division 
  : 
  — 
  

  

  

  

  ft. 
  

  

  in. 
  

  

  A. 
  — 
  Massive 
  argillaceous 
  sandstones 
  in 
  

  

  thick 
  beds 
  

  

  .. 
  575 
  

  

  

  

  Beds 
  (probably 
  sbales) 
  not 
  seen 
  

  

  

  .. 
  50 
  

  

  

  

  Massive 
  grey 
  sandstone 
  

  

  

  3 
  

  

  

  

  Shaly 
  beds 
  (not 
  seen) 
  

  

  ... 
  

  

  .. 
  100 
  

  

  

  

  Sbaly 
  sandstones 
  ... 
  

  

  ... 
  

  

  .. 
  35 
  

  

  

  

  Beds 
  not 
  seen 
  ... 
  

  

  ... 
  

  

  .. 
  125 
  

  

  

  

  Grey 
  sandstone 
  somewhat 
  shaly 
  

  

  Carried 
  over 
  

  

  .. 
  12 
  

  

  

  

  

  .. 
  900 
  

  

  

  

  ( 
  271 
  ) 
  

  

  