﻿132 
  

  

  PE0E. 
  J. 
  PEESTWICH 
  ON 
  A 
  PECTJLIAE 
  

  

  The 
  peculiar 
  features 
  of 
  this 
  Drift 
  are 
  the 
  absence 
  of 
  worn 
  debris 
  

   indicating 
  prolonged 
  water-action, 
  and 
  of 
  either 
  marine 
  or 
  fluviatile 
  

   remains 
  ; 
  the 
  presence, 
  it 
  may 
  be 
  said, 
  exclusively 
  of 
  the 
  remains 
  

   of 
  a 
  land-fauna 
  ; 
  its 
  high 
  position 
  of 
  150 
  to 
  260 
  feet 
  above 
  the 
  ad- 
  

   jacent 
  river-level; 
  the 
  irregularity 
  of 
  its 
  bedding; 
  and 
  its 
  wide 
  

   spread, 
  westward 
  towards 
  Hendred, 
  over 
  the 
  adjacent 
  plain. 
  Sec- 
  

   tions 
  of 
  it 
  are 
  to 
  be 
  seen 
  in 
  places 
  near 
  a 
  pond 
  and 
  in 
  a 
  shallow 
  

   excavation 
  two 
  miles 
  distant 
  from 
  the 
  cutting; 
  but 
  there 
  are 
  no 
  

   deep 
  sections. 
  

  

  The 
  only 
  analogous 
  beds 
  to 
  which 
  I 
  can 
  refer 
  this 
  Drift 
  are 
  the 
  

   heads 
  of 
  angular 
  rubble 
  overlying 
  the 
  Raised 
  Beaches 
  of 
  Sangatte 
  

   and 
  Brighton. 
  In 
  all 
  three 
  we 
  find 
  similar 
  mammalian 
  remains, 
  the 
  

   same 
  irregularity 
  of 
  bedding, 
  and 
  the 
  same 
  absence 
  of 
  wear 
  in 
  the 
  

   component 
  materials 
  ; 
  and 
  at 
  Sangatte 
  I 
  found 
  the 
  same 
  land- 
  

   shells. 
  The 
  only 
  difference 
  is 
  that 
  the 
  Sangatte 
  and 
  Brighton 
  

   drifts 
  are 
  more 
  flinty 
  and 
  coarser 
  ; 
  but 
  that 
  is 
  a 
  feature 
  merely 
  

   dependent 
  on 
  the 
  circumstance 
  that 
  at 
  both 
  these 
  places 
  the 
  adja- 
  

   cent 
  chalk 
  is 
  the 
  Chalk-with-flints, 
  whereas 
  at 
  Chilton 
  it 
  is 
  the 
  

   Lower 
  Chalk. 
  

  

  It 
  is 
  a 
  Drift 
  not 
  following 
  any 
  river-course 
  ; 
  nor 
  is 
  it 
  a 
  marine 
  

   Drift, 
  nor 
  a 
  glacial 
  Drift 
  from 
  the 
  northward 
  ; 
  but 
  the 
  constituent 
  

   parts 
  are 
  either 
  all 
  locals 
  or 
  else 
  derived 
  from 
  strata 
  immediately 
  

   southward 
  — 
  that 
  is 
  to 
  say, 
  from 
  the 
  Upper 
  Chalk-with-flints, 
  and 
  

   from 
  the 
  Lower 
  Tertiary 
  strata 
  which 
  cap 
  the 
  Chalk 
  hills 
  between 
  

   Ilsley 
  and 
  Newbury. 
  For 
  besides 
  the 
  glauconite 
  grains 
  which, 
  though 
  

   probably 
  from 
  the 
  Lower 
  Tertiaries, 
  may 
  be 
  also 
  from 
  the 
  Upper 
  

   G-reensand, 
  we 
  have 
  the 
  more 
  certain 
  Tertiary 
  sandstone 
  blocks 
  

   (Sarsen 
  stones) 
  ; 
  while 
  from 
  the 
  Upper 
  Chalk 
  we 
  not 
  only 
  have 
  the 
  

   flints 
  from 
  the 
  Chalk 
  hills 
  of 
  East 
  Ilsley, 
  but 
  abundant 
  harder 
  frag- 
  

   ments 
  of 
  the 
  limestone-chalk 
  derived 
  from 
  the 
  thin 
  bed 
  (two 
  to 
  

   five 
  feet) 
  of 
  chalk-rock 
  lying 
  between 
  the 
  Lower 
  and 
  the 
  Upper 
  

   Chalk, 
  and 
  which 
  crops 
  out 
  on 
  the 
  slope 
  of 
  the 
  great 
  chalk 
  escarp- 
  

   ment 
  one 
  mile 
  to 
  the 
  south 
  of 
  the 
  Chilton 
  cutting. 
  

  

  This 
  Drift 
  is 
  therefore 
  analogous 
  to 
  the 
  great 
  Land-wash 
  or 
  

   diluvial 
  deposit 
  which 
  I 
  have 
  described 
  as 
  overlying 
  the 
  Raised 
  

   Beaches 
  on 
  our 
  southern 
  coast 
  and 
  on 
  the 
  opposite 
  coast 
  of 
  France 
  ; 
  

   only 
  here 
  it 
  is 
  inland, 
  and 
  is 
  the 
  only 
  inland 
  case 
  of 
  a 
  Drift 
  so 
  

   closely 
  resembling 
  the 
  drifts 
  of 
  Brighton 
  and 
  Sangatte 
  that 
  I 
  have 
  

   met 
  with 
  in 
  the 
  South 
  of 
  England*. 
  

  

  It 
  appears 
  to 
  fill 
  hollows 
  on 
  this 
  elevated 
  chalk 
  plain 
  in 
  a 
  

   manner 
  rather 
  difficult 
  to 
  account 
  for. 
  The 
  hollows 
  may 
  have 
  been 
  

   the 
  deep 
  dry 
  combes 
  so 
  common 
  amongst 
  chalk 
  hills, 
  of 
  which 
  the 
  

   drift 
  has 
  filled 
  up 
  the 
  irregularities 
  and 
  spread 
  also 
  over 
  portions 
  of 
  

   the 
  adjacent 
  surface. 
  Further, 
  I 
  think 
  it 
  is 
  to 
  the 
  same 
  action 
  that 
  

   we 
  must 
  ascribe 
  the 
  trail 
  of 
  Sarsen 
  stones 
  which 
  are 
  scattered 
  lower 
  

   down 
  over 
  the 
  valley 
  of 
  soft 
  Upper 
  Greensand. 
  Although 
  so 
  many 
  

  

  * 
  There 
  are, 
  however, 
  others, 
  though 
  differently 
  constituted, 
  which 
  I 
  men- 
  

   tioned 
  in 
  a 
  paper 
  read 
  at 
  the 
  last 
  meeting 
  of 
  the 
  British 
  Association 
  at 
  Swansea, 
  

   but 
  as 
  yet 
  only 
  published 
  in 
  abstract. 
  

  

  