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  PROF. 
  J. 
  PRESTWICH 
  ON 
  THE 
  OCCURRENCE 
  OF 
  

  

  denudation 
  of 
  the 
  bed 
  of 
  gravel, 
  are 
  many 
  of 
  them 
  ovoids, 
  of 
  a 
  bright 
  

   ochreous 
  colour 
  ; 
  a 
  few 
  are 
  plough- 
  stained. 
  

  

  At 
  Dunks 
  Green 
  the 
  specimens 
  are 
  mostly 
  small 
  and 
  well-formed 
  

   pointed 
  ovoids. 
  One 
  of 
  them 
  was 
  taken 
  from 
  under 
  2 
  feet 
  of 
  gravel. 
  

   These 
  specimens 
  are 
  further 
  of 
  interest, 
  inasmuch 
  as, 
  although 
  now 
  

   found 
  mostly 
  on 
  the 
  surface, 
  the 
  small 
  but 
  prominent 
  incrustations 
  

   of 
  iron-oxide 
  and 
  sand 
  with 
  which 
  several, 
  together 
  with 
  the 
  pebbles, 
  

   are 
  spotted, 
  show 
  that 
  they 
  have 
  lain 
  in 
  a 
  ferruginous 
  matrix 
  and 
  

   have 
  been 
  brought 
  to 
  the 
  surface 
  by 
  partial 
  denudation 
  of 
  this 
  bed 
  

   of 
  drift-gravel. 
  

  

  The 
  Implements 
  of 
  the 
  older 
  higher 
  or 
  hill-levels 
  of 
  the 
  Shode 
  

   basin 
  present 
  characters 
  very 
  similar 
  to 
  the 
  foregoing, 
  except 
  that 
  

   on 
  the 
  whole 
  they 
  may 
  be 
  somewhat 
  ruder, 
  and 
  there 
  is 
  a 
  prepon- 
  

   derance 
  of 
  the 
  smaller 
  and 
  ovoid 
  forms 
  with 
  fewer 
  of 
  the 
  large 
  lance- 
  

   head 
  type. 
  

  

  On 
  the 
  west 
  side 
  of 
  Oldbury 
  Hill 
  * 
  specimens 
  are 
  found 
  on 
  the 
  

   surface 
  at 
  Kilnfield, 
  Upper 
  Patch 
  Grove, 
  and 
  Sty 
  ants 
  Bottom. 
  Some 
  

   of 
  these 
  are 
  lance-head 
  forms, 
  and 
  others 
  are 
  small 
  well-finished 
  

   ovoids 
  (PI. 
  X. 
  fig. 
  4), 
  sharp 
  and 
  uninjured. 
  The 
  majority 
  are 
  por- 
  

   cellaneous, 
  and 
  with 
  a 
  strong 
  patina. 
  With 
  them 
  are 
  a 
  few 
  large, 
  

   rough, 
  flake-scrapers. 
  On 
  the 
  east 
  of 
  Oldbury, 
  flint 
  implements 
  have 
  

   been 
  found 
  between 
  the 
  levels 
  of 
  400 
  and 
  500 
  ft., 
  and 
  one 
  above 
  that 
  

   height. 
  They 
  are 
  mostly 
  of 
  small 
  size, 
  light 
  bluish- 
  white 
  in 
  colour, 
  

   or 
  porcellaneous. 
  Some 
  are 
  pointed 
  ovoids, 
  others 
  thick 
  flakes 
  worked 
  

   on 
  one 
  side, 
  and 
  a 
  few 
  scrapers. 
  

  

  To 
  the 
  south 
  of 
  Ightham 
  there 
  are 
  a 
  number 
  of 
  the 
  older 
  high- 
  

   level 
  or 
  hill-drifts, 
  on 
  the 
  surface 
  of 
  which 
  Mr. 
  Harrison 
  has 
  found 
  

   palaeolithic 
  flint 
  implements. 
  It 
  is 
  not 
  necessary 
  to 
  specify 
  all 
  these. 
  

   As 
  a 
  type 
  of 
  the 
  whole, 
  we 
  take 
  the 
  one 
  locality 
  which 
  has 
  proved 
  

   most 
  productive, 
  viz. 
  the 
  field 
  west 
  of 
  Bewley 
  Farm, 
  where 
  the 
  ground 
  

   at 
  a 
  height 
  of 
  from 
  420 
  to 
  430 
  ft. 
  is 
  covered 
  by 
  a 
  much-weathered 
  

   subangular 
  chert-drift, 
  with 
  a 
  few 
  subangular 
  flints 
  and 
  pebbles. 
  

   Out 
  of 
  23 
  specimens 
  from 
  this 
  place, 
  taken 
  at 
  random, 
  I 
  found 
  — 
  

  

  6 
  well-formed 
  pointed 
  ovoids, 
  mostly 
  with 
  a 
  strong 
  twist 
  ; 
  two 
  of 
  these 
  were 
  

  

  yellow 
  and 
  uninjured, 
  and 
  two 
  were 
  white 
  and 
  porcellaneous, 
  and 
  two 
  

   plough-stained 
  (PL 
  X. 
  fig. 
  7). 
  

  

  7 
  smaller 
  ovoids 
  ; 
  mostly 
  porcellaneous, 
  with 
  a 
  tinge 
  of 
  yellow, 
  some 
  of 
  them 
  

  

  plough-stained. 
  

  

  2 
  small 
  pointed 
  lance-shaped 
  white 
  implements, 
  stained 
  by 
  the 
  plough. 
  

  

  5 
  more 
  massive 
  pointed 
  implements, 
  white 
  or 
  yellowish, 
  one 
  of 
  which 
  was 
  sharp 
  

   and 
  uninjured, 
  one 
  patinated, 
  but 
  with 
  the 
  glaze 
  rubbed 
  off 
  its 
  edges 
  and 
  

   much 
  worn, 
  and 
  two 
  rude 
  specimens 
  damaged 
  by 
  plough. 
  

  

  3 
  bright-yellow 
  thick 
  flakes, 
  worked 
  at 
  edges 
  and 
  uninjured 
  (PL 
  X. 
  fig. 
  3). 
  

  

  In 
  the 
  Darent 
  Basin 
  the 
  specimens 
  from 
  the 
  high 
  level 
  (530 
  ft.) 
  

   of 
  Lower 
  Bitchet 
  are 
  varied 
  in 
  form, 
  are 
  mostly 
  white 
  and 
  por- 
  

   cellaneous, 
  but 
  dimmed, 
  and 
  show 
  but 
  little 
  sign 
  of 
  wear, 
  except 
  by 
  

  

  * 
  The 
  alternation 
  of 
  hard 
  cherty 
  beds 
  with 
  soft 
  sands 
  at 
  Oldbury 
  Hill 
  would 
  

   tend 
  to 
  the 
  natural 
  formation 
  of 
  rock-shelters, 
  and 
  this, 
  with 
  the 
  defensive 
  

   advantages 
  of 
  the 
  position, 
  may 
  have 
  attracted 
  the 
  larger 
  population 
  which, 
  

   from 
  the 
  abundance 
  of 
  worked 
  flints, 
  seems 
  to 
  have 
  centred 
  for 
  a 
  few 
  miles 
  

   round 
  this 
  conspicuous 
  hill. 
  

  

  