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  C0DRINGTON 
  SECTION 
  NEAR 
  THAME. 
  

  

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  GQ 
  

  

  ES 
  

  

  quantity 
  of 
  Mammalian 
  remains 
  has 
  been 
  ex- 
  

   posed 
  during 
  the 
  past 
  summer. 
  

  

  Externally 
  the 
  undulation 
  of 
  the 
  ground 
  cut 
  

   through 
  by 
  the 
  Railway 
  does 
  not 
  differ 
  from 
  

   that 
  around 
  it. 
  It 
  is 
  detached 
  on 
  all 
  sides, 
  the 
  

   Thame 
  river 
  and 
  two 
  small 
  tributaries 
  nearly 
  

   surrounding 
  it. 
  The 
  highest 
  part, 
  which 
  is 
  not 
  

   far 
  from 
  the 
  cutting, 
  is 
  not 
  more 
  than 
  25 
  feet 
  

   above 
  the 
  water 
  in 
  the 
  nearest 
  stream, 
  and 
  

   from 
  it 
  the 
  ground 
  falls 
  gradually 
  with 
  a 
  

   rounded 
  outline. 
  

  

  Fig. 
  1. 
  — 
  Plan 
  showing 
  the 
  position 
  of 
  the 
  sec- 
  

   tion 
  with 
  Mammalian 
  remains, 
  near 
  Thame. 
  

  

  The 
  position 
  of 
  the 
  cutting 
  with 
  relation 
  

   to 
  the 
  existing 
  streams 
  is 
  shown 
  in 
  the 
  plan 
  

   (fig. 
  1). 
  The 
  section 
  (fig. 
  2) 
  has 
  the 
  vertical 
  

   heights 
  exaggerated 
  twice. 
  

  

  Resting 
  on 
  the 
  Kimmeridge 
  Clay 
  is 
  a 
  bed 
  of 
  

   coarse 
  gravel 
  averaging 
  2 
  feet 
  in 
  thickness, 
  

   abutting 
  against 
  a 
  bank 
  of 
  undisturbed 
  clay 
  

   on 
  the 
  west, 
  and 
  gradually 
  dipping 
  eastward. 
  

   The 
  materials 
  of 
  the 
  gravel 
  are 
  — 
  angular 
  

   chalk-flints 
  (about 
  50 
  per 
  cent, 
  of 
  the 
  whole), 
  

   quartz, 
  hornstone, 
  and 
  ironstone, 
  in 
  pebbles 
  

   or 
  fragments 
  more 
  or 
  less 
  rounded, 
  rolled 
  

   lumps 
  of 
  chalk, 
  and 
  Tertiary 
  pebbles. 
  The 
  

   order 
  in 
  which 
  they 
  are 
  here 
  mentioned 
  is 
  that 
  

   of 
  their 
  relative 
  abundance. 
  Blocks 
  of 
  Sarsen 
  

   or 
  grey-w 
  T 
  ether 
  sandstone, 
  in 
  size 
  from 
  half 
  a 
  

   cubic 
  yard 
  downwards, 
  occur 
  in 
  the 
  gravel. 
  

  

  The 
  pebbles 
  of 
  quartz, 
  and 
  the 
  hornstone 
  

   and 
  ironstone, 
  may 
  have 
  been 
  derived 
  from 
  

   the 
  neighbouring 
  Lower 
  Greensand 
  beds 
  ; 
  but 
  

   a 
  fragment 
  of 
  mica-schist, 
  which 
  I 
  obtained 
  

   from 
  the-gravel, 
  seems 
  to 
  point 
  to 
  the 
  Northern 
  

   Drift 
  as 
  the 
  source 
  of 
  at 
  least 
  some 
  of 
  the 
  

   materials. 
  

  

  