﻿Vol. 
  53.] 
  ASSOCIATED 
  DEPOSITS 
  AT 
  NEWBURY. 
  425 
  

  

  peculiarly 
  ' 
  Glacial 
  ' 
  species. 
  (4) 
  The 
  non-occurrence 
  of 
  any 
  

   fossils 
  in 
  the 
  Southern 
  Drift. 
  The 
  colour 
  of 
  the 
  latter 
  is 
  grey, 
  

   and 
  the 
  gravel 
  is 
  invariably 
  bleached 
  in 
  the 
  upper 
  layers 
  ; 
  whereas 
  

   the 
  Donnington 
  gravel 
  is 
  always 
  of 
  a 
  rich 
  ferruginous 
  brown. 
  The 
  

   matrix 
  of 
  both 
  is 
  a 
  clayey 
  quartzose 
  sand 
  ; 
  though 
  clean 
  patches, 
  

   entirely 
  free 
  from 
  clay, 
  are 
  often 
  intercalated 
  in 
  both 
  Drifts. 
  

  

  The 
  Donnington 
  gravel 
  appears 
  to 
  thin 
  out 
  to 
  the 
  west, 
  as 
  the 
  

   watershed 
  region 
  upon 
  which 
  it 
  lies 
  rises 
  above 
  the 
  level 
  of 
  the 
  

   gravel. 
  Eastwards 
  the 
  carving 
  out 
  of 
  the 
  two 
  valleys 
  at 
  their 
  

   junction 
  has 
  of 
  course 
  removed 
  it. 
  

  

  The 
  northern 
  boundary 
  of 
  this 
  gravel 
  is 
  the 
  Lambourne 
  Valley 
  ; 
  

   the 
  southern 
  is 
  formed 
  by 
  the 
  Kennet 
  Valley, 
  and 
  the 
  rising 
  

   ground 
  limits 
  it 
  westward. 
  

  

  § 
  4. 
  The 
  Upper 
  Eiver-gravel 
  or 
  Terrace-gravel. 
  

  

  Below 
  the 
  level 
  of 
  the 
  ' 
  Glacial 
  Drift,' 
  at 
  Newbury, 
  there 
  are 
  

   fine 
  broad 
  terraces 
  of 
  ' 
  Eiver-gravel 
  ' 
  on 
  both 
  sides 
  of 
  the 
  valley. 
  

   These 
  terraces 
  I 
  have 
  called 
  ' 
  Upper 
  Eiver-gravel' 
  for 
  the 
  purposes 
  

   of 
  this 
  paper. 
  Where 
  the 
  base 
  has 
  been 
  exposed, 
  it 
  is 
  seen 
  to 
  rest 
  

   upon 
  firm 
  green 
  sands, 
  which 
  I 
  conjecture 
  are 
  the 
  lowest 
  beds 
  

   of 
  the 
  Eeading 
  Series, 
  from 
  the 
  evidence 
  given 
  by 
  the 
  well 
  at 
  Green- 
  

   ham 
  Park 
  (p. 
  422). 
  The 
  Upper 
  Eiver-gravel 
  is 
  usually 
  about 
  12 
  feet 
  

   thick 
  at 
  the 
  terrace-edges 
  nearest 
  the 
  river. 
  In 
  Bull's 
  Lane, 
  on 
  

   the 
  south 
  side 
  of 
  the 
  valley, 
  I 
  obtained 
  the 
  following 
  section 
  : 
  — 
  

  

  Pig. 
  3. 
  — 
  Section 
  in 
  the 
  Upper 
  River-gravel 
  at 
  Bull's 
  Lane. 
  

   (No. 
  7 
  in 
  the 
  Map, 
  PL 
  XXX.) 
  

  

  2 
  feet. 
  

  

  

  3 
  feet 
  .*-«•• 
  ,\ 
  sC 
  * 
  ' 
  V^ 
  - 
  '< 
  €) 
  ' 
  b 
  ^ 
  *** 
  l 
  V~* 
  

  

  exposed. 
  ? 
  *• 
  /%- 
  w 
  „ 
  >* 
  :« 
  -V 
  '■*. 
  : 
  . 
  *C* 
  ,V 
  > 
  ■ 
  -. 
  ■ 
  j^*, 
  > 
  

  

  [Vertical 
  scale 
  : 
  -g- 
  inch 
  = 
  1 
  foot.] 
  

  

  a 
  = 
  Flint-gravel 
  of 
  the 
  same 
  composition 
  as 
  c, 
  but 
  coarser. 
  Surface 
  unseen. 
  

  

  b 
  = 
  Fine, 
  soft, 
  mealy 
  quartzose 
  sand 
  with 
  black, 
  carbonaceous 
  grains. 
  Weathers 
  

   to 
  a 
  ferruginous 
  yellow. 
  This 
  bed 
  thins 
  out 
  at 
  20 
  yards, 
  in 
  the 
  direction 
  

   of 
  the 
  arrow. 
  

  

  c 
  = 
  Coarse 
  flint-gravel, 
  with 
  large 
  unstained, 
  black, 
  and 
  white-coated 
  flints, 
  

   1 
  green-coated 
  flint, 
  and 
  a 
  few 
  red 
  flints. 
  No 
  gritstone 
  : 
  a 
  few 
  rounded 
  

   pebbles 
  of 
  quartzite 
  and 
  small 
  flints. 
  Composition 
  as 
  follows: 
  80% 
  

   subangular 
  brown 
  flints, 
  19 
  °/ 
  rolled 
  black 
  flints, 
  and 
  1 
  % 
  subangular 
  

   sarsens, 
  whose 
  longest 
  diameter 
  is 
  12 
  inches. 
  The 
  matrix 
  of 
  the 
  gravel 
  

   is 
  brown 
  clay. 
  

  

  