﻿2 
  , 
  6 
  PEor. 
  J. 
  presiwich 
  ox 
  the 
  occurrexce 
  oe 
  

  

  at 
  a 
  height 
  of 
  340 
  feet. 
  These 
  latter, 
  however, 
  properly 
  belong 
  to 
  

   the 
  basin 
  of 
  the 
  Leybourne 
  valley. 
  

  

  Westward 
  of 
  Ightham 
  there 
  are 
  traces 
  of 
  a 
  similar 
  drift 
  at 
  

   Oldbury 
  Place. 
  Kilnfield, 
  and 
  some 
  other 
  places 
  round 
  Oldbury 
  

   Hill. 
  which, 
  like 
  that 
  on 
  the 
  slope 
  of 
  Sheet 
  Hill, 
  are 
  so 
  much 
  

   mixed 
  up 
  with 
  local 
  debris, 
  swept 
  down 
  from 
  the 
  heights 
  of 
  Oldbury 
  

   Hill 
  and 
  Ightham 
  Common 
  above 
  them 
  *, 
  that 
  their 
  distinctive 
  

   character 
  is 
  obscured 
  or 
  lost. 
  I 
  shall 
  have 
  occasion 
  at 
  another 
  time 
  

   to 
  show 
  that 
  these 
  hill-gravels 
  may 
  be 
  connected 
  with 
  other 
  out- 
  

   liers 
  described 
  by 
  lEr. 
  Topley 
  between 
  Sevenoaks 
  and 
  Westerham. 
  

  

  In 
  the 
  Ightham 
  Basin, 
  a 
  drift, 
  higher 
  than 
  that 
  of 
  the 
  river- 
  

   valleys, 
  and 
  consisting 
  of 
  Lower-Greensand 
  debris 
  mixed 
  with 
  angu- 
  

   lar 
  flint 
  and 
  Tertiary 
  flint-pebbles, 
  occurs 
  on 
  the 
  left 
  bank 
  of 
  the 
  

   Shore, 
  near 
  Crouch, 
  at 
  the 
  level 
  of 
  356 
  feet, 
  and 
  again 
  above 
  Old 
  

   Soar 
  : 
  while 
  between 
  the 
  two. 
  and 
  at 
  rather 
  a 
  higher 
  level, 
  there 
  are 
  

   pockets 
  containing 
  numerous 
  Tertiary 
  flint-pebbles. 
  At 
  the 
  junc- 
  

   tion 
  of 
  the 
  old 
  Shode 
  valley 
  with 
  that 
  of 
  the 
  Medway, 
  and 
  high 
  up 
  

   the 
  side 
  of 
  the 
  hills, 
  is 
  another 
  isolated 
  patch 
  of 
  old 
  drift, 
  formed 
  of 
  

   Oldbury 
  Stone, 
  oehreous 
  flints, 
  white 
  hints, 
  and 
  Tertiary 
  pebbles, 
  

   at 
  the 
  level 
  of 
  350 
  feet 
  on 
  Gover 
  Hill. 
  This 
  is 
  the 
  furthest 
  point 
  

   south 
  to 
  which 
  this 
  drift 
  has 
  been 
  traced. 
  On 
  the 
  opposite 
  side 
  of 
  

   the 
  valley, 
  in 
  a 
  field 
  west 
  of 
  Bewley 
  Farm, 
  a 
  similar 
  old 
  drift 
  of 
  

   much-weathered 
  chert, 
  with 
  very 
  few 
  flints 
  and 
  flint-pebbles, 
  is 
  

   met 
  with 
  near 
  Bewley, 
  at 
  a 
  height 
  of 
  430 
  feet, 
  and 
  extending 
  to 
  

   500 
  feet 
  at 
  Bose 
  "Wood. 
  On 
  the 
  other 
  side 
  of 
  the 
  hill 
  on 
  the 
  west, 
  

   which, 
  at 
  the 
  lowest 
  pass, 
  is 
  560 
  feet 
  high, 
  a 
  sprinkling 
  of 
  angular 
  

   and 
  subangular 
  hint-pebbles 
  again 
  occurs 
  between 
  Lower 
  Bitchet 
  

   and 
  Stone 
  Street, 
  at 
  the 
  head 
  of 
  the 
  dry 
  valley 
  that 
  joins 
  the 
  Darent 
  

   valley 
  at 
  Seal 
  (figs. 
  3, 
  4, 
  p. 
  272). 
  Between 
  Oldbury 
  and 
  Seal 
  a 
  

   similar 
  drift, 
  but 
  with 
  more 
  chert 
  and 
  ragstone, 
  is 
  met 
  with 
  on 
  the 
  

   slope 
  of 
  the 
  Greensand 
  range, 
  near 
  Chart 
  Farm. 
  Stonepit 
  Farm, 
  and 
  

   Fuller 
  Street, 
  at 
  a 
  height 
  of 
  from 
  360 
  to 
  420 
  feet 
  or 
  thereabouts 
  f. 
  

   On 
  the 
  hill 
  west 
  oi 
  Seal 
  there 
  is 
  a 
  similar 
  drift 
  i 
  at 
  280-310 
  feet), 
  

   but 
  it 
  is 
  more 
  flinty 
  

  

  None 
  of 
  these 
  high-drift 
  gravels, 
  for 
  the 
  discovery 
  of 
  all 
  of 
  which 
  

   we 
  are 
  indebted 
  to 
  Mr. 
  Harrison, 
  can 
  be 
  referred 
  to 
  any 
  existing 
  

   system 
  of 
  drainage 
  or 
  river-action 
  contingent 
  upon 
  the 
  present 
  con- 
  

   figuration 
  of 
  the 
  country, 
  unless 
  we 
  except 
  the 
  patch 
  at 
  Seal, 
  which 
  

   may 
  be 
  connected 
  with 
  the 
  Bitchet 
  and 
  Stone-Street 
  Valley 
  as 
  an 
  old 
  

   tributary 
  of 
  the 
  Darent 
  ; 
  but 
  the 
  levels 
  are 
  difficult 
  to 
  coordinate. 
  

  

  We 
  will 
  now 
  revert 
  to 
  the 
  Ightham 
  valley, 
  and 
  define 
  the 
  drift- 
  

   beds 
  which 
  can 
  be 
  referred 
  to 
  the 
  action 
  of 
  the 
  Shode, 
  as 
  it 
  flowed 
  

   at 
  successive 
  levels 
  during 
  the 
  excavation 
  of 
  its 
  valley-channel. 
  

   We 
  may 
  premise 
  that, 
  as 
  a 
  consequence 
  of 
  the 
  low 
  watersheds 
  

   before 
  named 
  in 
  the 
  Holmsdale 
  valley, 
  the 
  maximum 
  level 
  of 
  

   the 
  initial 
  stream 
  could 
  not 
  have 
  exceeded 
  by 
  more 
  than 
  from 
  50 
  to 
  

  

  * 
  I 
  suspect 
  that 
  some 
  of 
  the 
  other 
  surface-drifts 
  in 
  other 
  parts 
  of 
  the 
  dis- 
  

   trict 
  ruay 
  prove 
  to 
  be 
  similarly 
  masked. 
  

  

  v 
  ;me 
  of 
  this 
  may. 
  like 
  the 
  drift 
  around 
  Oldbury. 
  be 
  local 
  debris 
  or 
  trail 
  

   from 
  the 
  higher 
  ground 
  above. 
  

  

  