﻿638 
  MR. 
  H. 
  G. 
  LYONS 
  ON 
  THE 
  BAGSHOT 
  BEDS 
  

  

  of 
  springs 
  and 
  form 
  of 
  the 
  ground 
  passing 
  just 
  east 
  of 
  Rails 
  Farni 
  T 
  

   where 
  there 
  is 
  a 
  sand-pit 
  in 
  the 
  Upper 
  Bagshot, 
  skirting 
  the 
  hill 
  

   above 
  Duchies 
  and 
  that 
  by 
  Pirbright 
  Lodge. 
  Then 
  it 
  runs 
  back 
  to 
  

   Furzehill 
  Pond, 
  and 
  skirting, 
  or 
  possibly 
  crossing 
  and 
  recrossing, 
  the 
  

   railway, 
  takes 
  in 
  Dawnay's 
  Hill 
  just 
  north 
  of 
  Pirbright 
  Green, 
  and 
  

   then 
  turns 
  northwards 
  just 
  east 
  of 
  Brook 
  wood 
  Station, 
  and 
  follows 
  

   the 
  course 
  of 
  the 
  brook 
  up 
  to 
  Cowshot 
  Farm, 
  probably 
  crossing 
  

   it 
  just 
  above, 
  and 
  coming 
  down 
  the 
  north 
  side 
  before 
  turning 
  back 
  

   to 
  the 
  ISLE, 
  across 
  Bisley 
  Common. 
  This 
  point 
  is 
  of 
  special 
  interest, 
  

   as 
  this 
  has 
  been 
  selected 
  as 
  the 
  site 
  for 
  the 
  National 
  Rifle 
  Association 
  

   camp 
  to 
  replace 
  Wimbledon. 
  

  

  The 
  beds 
  are 
  dipping 
  slowly 
  northwards, 
  and 
  the 
  clayey 
  top 
  of 
  the 
  

   Middle 
  Bagshots 
  ought, 
  with 
  the 
  assistance 
  of 
  a 
  system 
  of 
  French 
  open 
  

   drains, 
  filled 
  up 
  with 
  large 
  stones, 
  to 
  drain 
  this 
  piece 
  of 
  ground 
  suc- 
  

   cessfully. 
  Then 
  again, 
  as 
  at 
  the 
  new 
  well 
  at 
  Brookwood 
  Stumps, 
  the 
  

   beds 
  of 
  greensand 
  some 
  20 
  feet 
  or 
  30 
  feet 
  down 
  in 
  the 
  Middle 
  Bagshots 
  

   would 
  probably 
  furnish 
  an 
  ample 
  supply 
  of 
  water, 
  besides 
  that 
  thrown 
  

   out 
  by 
  springs 
  at 
  the 
  base 
  of 
  the 
  Upper-Bagshot 
  sands, 
  unless 
  exception 
  

   should 
  be 
  taken 
  to 
  the 
  quality 
  of 
  this 
  greensand 
  water 
  * 
  ; 
  I 
  may 
  also 
  

   mention 
  that 
  the 
  surface 
  of 
  South 
  Camp, 
  Aldershot, 
  is 
  similar 
  in 
  

   structure 
  though 
  the 
  dip 
  is 
  steeper, 
  and 
  that 
  all 
  the 
  numerous 
  shallow 
  

   wells, 
  about 
  20 
  feet 
  deep, 
  drawing 
  their 
  water 
  from 
  these 
  Greensand 
  

   beds 
  have 
  now 
  been 
  condemned 
  for 
  drinking-purposes. 
  They 
  are 
  

   closed 
  wells, 
  and 
  so 
  have 
  no 
  chance 
  of 
  their 
  water 
  becoming 
  purified 
  

   by 
  oxidation. 
  

  

  From 
  this 
  point 
  the 
  boundary 
  is 
  drawn 
  from 
  the 
  ground 
  and 
  from 
  

   sections 
  and 
  exposures 
  at 
  Donkey 
  Town, 
  Bisley, 
  and 
  Knaphill, 
  till 
  

   the 
  Ascot 
  railway 
  branch 
  is 
  crossed, 
  and 
  the 
  line 
  bends 
  to 
  the 
  west 
  

   south 
  of 
  Swinley 
  Park. 
  From 
  this 
  point, 
  for 
  want 
  of 
  certain 
  know- 
  

   ledge, 
  the 
  colouring 
  has 
  not 
  been 
  carried 
  beyond 
  the 
  300' 
  contour 
  

   up 
  to 
  Broadmoor 
  Bottom, 
  and 
  from 
  there 
  to 
  the 
  point 
  260' 
  O.D., 
  

   where, 
  as 
  referred 
  to 
  above, 
  the 
  pebble-bed 
  has 
  been 
  recorded. 
  

  

  West 
  of 
  South 
  Camp, 
  Aldershot, 
  the 
  boundary 
  of 
  the 
  Upper 
  

   Bagshot 
  crosses 
  the 
  centre 
  of 
  the 
  Long 
  Valley, 
  bends 
  east 
  of 
  the 
  

   Racecourse, 
  and 
  runs 
  up 
  into 
  Beacon 
  Hill, 
  where 
  the 
  pebble-bed 
  

   occurs 
  at 
  about 
  400' 
  O.D. 
  west 
  of 
  the 
  Waterworks. 
  

  

  I 
  do 
  not 
  know 
  how 
  much 
  of 
  the 
  actual 
  top 
  of 
  Caesar's 
  Camp, 
  &c, 
  

   should 
  be 
  coloured 
  as 
  Upper 
  Bagshot, 
  as 
  the 
  gravel-capping 
  obscures 
  

   all 
  traces 
  of 
  the 
  underlying 
  sands, 
  and 
  where 
  wells 
  have 
  been 
  sunk 
  it 
  

   has 
  been 
  at 
  the 
  western 
  end 
  of 
  the 
  hill, 
  near 
  Heath 
  House. 
  

  

  Cove 
  Common 
  and 
  the 
  part 
  round 
  Fleet 
  I 
  have 
  mapped 
  as 
  Upper 
  

   Bagshot, 
  on 
  the 
  strength 
  of 
  numerous 
  wells, 
  about 
  18' 
  and 
  20' 
  in 
  

   depth, 
  which 
  have 
  been 
  sunk, 
  and 
  various 
  ditch-sections 
  ; 
  and 
  in 
  no 
  

   case 
  have 
  I 
  been 
  able 
  to 
  obtain 
  any 
  good 
  evidence 
  of 
  any 
  Middle- 
  

   Bagshot 
  beds, 
  but 
  only 
  of 
  normal 
  Upper-Bagshot 
  sand 
  or 
  the 
  over- 
  

   lying 
  drift 
  sandy 
  gravel. 
  Round 
  Bramshot 
  Farm, 
  between 
  Fleet 
  Pond 
  

   and 
  Hawley 
  Pond, 
  the 
  soil 
  becomes 
  clayey, 
  and 
  on 
  p. 
  313 
  of 
  Prof. 
  

   Prestwich's 
  ' 
  Geology/ 
  vol. 
  ii., 
  Carclita 
  planicostata 
  is 
  quoted 
  as 
  having 
  

   been 
  found 
  at 
  Hawley 
  Pond, 
  so 
  we 
  perhaps 
  have 
  here 
  a 
  Middle 
  Bag- 
  

   * 
  Dr. 
  Irving, 
  Geol. 
  Mag. 
  1885, 
  p. 
  17. 
  

  

  