﻿AND 
  THEIE 
  STRATIGKAPHY. 
  635 
  

  

  In 
  Brookwood 
  Stumps, 
  just 
  north 
  of 
  the 
  Railway, 
  in 
  a 
  well 
  sunk 
  at 
  

   a 
  new 
  brick 
  house, 
  there 
  was 
  nassed 
  through 
  

  

  ft. 
  

  

  Yellow 
  loam 
  10 
  \ 
  Middle 
  

  

  Dark-green 
  sharp 
  sand 
  with 
  thick 
  line 
  of 
  pebbles 
  7 
  J 
  Bagshot. 
  

  

  Total 
  17 
  

  

  Level 
  of 
  well-mouth 
  about 
  156', 
  thus 
  giving 
  about 
  160' 
  for 
  the 
  

   top 
  of 
  the 
  Middle 
  Bagshot, 
  which 
  crops 
  out 
  at 
  170' 
  at 
  the 
  south 
  

   end 
  and 
  175' 
  at 
  the 
  north 
  end 
  of 
  Knaphill 
  Common. 
  

  

  By 
  the 
  Gordon 
  Boys' 
  Home 
  it 
  crops 
  out 
  in 
  a 
  ditch 
  below 
  the 
  sand- 
  

   pits 
  at 
  the 
  top 
  of 
  the 
  hill 
  at 
  165', 
  and 
  at 
  160' 
  on 
  the 
  north 
  side 
  

   of 
  the 
  hill. 
  East 
  of 
  this, 
  pebble 
  -gravel, 
  overlying 
  clayey 
  Middle- 
  

   Bagshot 
  beds, 
  occurs 
  on 
  Stanners 
  Hill 
  at 
  170', 
  and 
  also 
  at 
  200' 
  

   in 
  the 
  road 
  east 
  of 
  Childown 
  Hall. 
  

  

  Now 
  Mr. 
  Hudleston 
  * 
  gives 
  the 
  base 
  of 
  the 
  Ongar-Hill 
  Middle- 
  

   Bagshot 
  Clays 
  as 
  100' 
  above 
  O.D., 
  so 
  we 
  may 
  take 
  150' 
  as 
  about 
  

   the 
  top 
  of 
  the 
  Middle-Bagshot 
  beds 
  there 
  originally, 
  which 
  is 
  a 
  fall 
  

   of 
  15' 
  from 
  the 
  Royal 
  Albert 
  Asylum 
  Well, 
  and 
  gives 
  us 
  the 
  lowest 
  

   point 
  we 
  have 
  as 
  yet 
  got 
  for 
  these 
  beds, 
  and 
  Row-Hill 
  brickyard 
  

   is 
  about 
  the 
  same. 
  

  

  He 
  also 
  gives 
  the 
  base 
  of 
  the 
  Woburn 
  brickearths 
  as 
  60' 
  above 
  O.D., 
  

   so 
  if 
  they 
  should 
  be 
  basal 
  Middle 
  Bagshot 
  the 
  upper 
  limit 
  would 
  

   hardly 
  rise 
  above 
  120' 
  above 
  O.D. 
  

  

  Coming 
  now 
  to 
  Hampshire 
  (and 
  omitting 
  any 
  recapitulation 
  of 
  

   altitudes 
  of 
  these 
  beds 
  given 
  in 
  my 
  previous 
  paper) 
  f, 
  at 
  a 
  well 
  sunk 
  

   at 
  Farnborough 
  Rectory, 
  the 
  Clay 
  at 
  the 
  base 
  of 
  the 
  Upper 
  Bagshot 
  

   was 
  reached 
  at 
  a 
  depth 
  of 
  46 
  feet 
  from 
  the 
  surface, 
  which 
  was 
  at 
  

   250' 
  above 
  O.D., 
  so 
  we 
  here 
  get 
  204' 
  for 
  our 
  upper 
  limit. 
  

  

  Dr. 
  Irving 
  has 
  also 
  informed 
  me 
  of 
  wells 
  at 
  Hawley 
  Vicarage 
  and 
  

   Minley 
  Manor, 
  where 
  the 
  Middle-Bagshot 
  strata 
  had 
  not 
  been 
  pene- 
  

   trated 
  when 
  a 
  point 
  180' 
  above 
  O.D. 
  had 
  been 
  reached. 
  

  

  Here 
  perhaps 
  the 
  well 
  at 
  Mychett 
  Place, 
  Frimley, 
  should 
  be 
  

   mentioned, 
  though 
  I 
  cannot 
  produce 
  any 
  additional 
  evidence 
  in 
  

   explanation 
  of 
  that 
  furnished 
  by 
  Dr. 
  Irving 
  % 
  ; 
  but 
  taking 
  into 
  

   account 
  the 
  base 
  of 
  the 
  Upper 
  Bagshot 
  at 
  the 
  Farnborough-Rectory 
  

   well 
  at 
  204' 
  O.D., 
  and 
  the 
  fall 
  of 
  the 
  beds 
  as 
  I 
  show 
  it 
  in 
  the 
  

   contoured 
  plan, 
  I 
  would 
  suggest 
  the 
  reference 
  of 
  the 
  first 
  bed 
  only, 
  

   " 
  White 
  sand 
  53 
  feet," 
  to 
  the 
  Upper 
  Bagshot, 
  the 
  next 
  42 
  feet 
  to 
  

   the 
  Middle 
  Bagshot, 
  then 
  about 
  102 
  feet 
  to 
  the 
  Lower 
  Bagshot, 
  and 
  

   the 
  remainder 
  to 
  the 
  London 
  Clay, 
  though 
  I 
  know 
  the 
  assignment 
  of 
  

   so 
  great 
  a 
  development 
  of 
  sandy 
  beds 
  to 
  the 
  London 
  Clay 
  has 
  been 
  

   strongly 
  objected 
  to. 
  

  

  If, 
  now, 
  with 
  the 
  aid 
  of 
  these 
  data 
  the 
  area 
  be 
  contoured, 
  the 
  

   result 
  is 
  (not 
  expecting 
  any 
  great 
  topographical 
  accuracy), 
  I 
  think, 
  

   of 
  some 
  interest. 
  We 
  have 
  a 
  well-marked 
  anticlinal, 
  of 
  which 
  the 
  

   axis 
  points 
  upon 
  Windsor 
  Castle 
  (where, 
  of 
  course, 
  the 
  Chalk 
  has 
  

   been 
  brought 
  up 
  through 
  the 
  Lower 
  Tertiaries), 
  and 
  this 
  anticlinal 
  

   seems 
  to 
  pass 
  through 
  the 
  Swinley 
  and 
  Wellington-College 
  area, 
  and 
  

  

  * 
  Q. 
  J. 
  G. 
  S. 
  vol. 
  xliii. 
  p. 
  452. 
  t 
  Ibid. 
  vol. 
  xliii. 
  p. 
  431. 
  

  

  J 
  Ibid. 
  vol. 
  xli. 
  p. 
  496. 
  

  

  