﻿678 
  

  

  SEAELES 
  V. 
  WOOD 
  OJN" 
  THE 
  jVEWEK 
  

  

  given 
  in 
  the 
  first 
  part 
  of 
  this 
  memoir, 
  of 
  which, 
  as 
  regards 
  the 
  emer- 
  

   gence 
  represented 
  there 
  by 
  the 
  shaded 
  (and 
  in 
  the 
  present 
  map 
  by 
  

   the 
  black) 
  areas, 
  Map 
  3 
  is 
  an 
  enlargement, 
  showing 
  the 
  emerged 
  

   parts 
  in 
  the 
  greater 
  detail 
  which 
  the 
  scale 
  of 
  it 
  allows*. 
  The 
  

   valleys, 
  which 
  have 
  now 
  become 
  occupied 
  by 
  rivers, 
  were, 
  during 
  

   the 
  advance 
  of 
  the 
  ice 
  of 
  the 
  Chalky 
  Clay, 
  channels 
  between 
  the 
  

   islands 
  (and 
  also 
  inlets 
  from 
  such 
  channels) 
  which 
  came 
  into 
  exis- 
  

   tence 
  from 
  the 
  emergence 
  of 
  the 
  islands 
  ; 
  and 
  by 
  these 
  channels, 
  in 
  

   the 
  parts 
  to 
  which 
  the 
  ice 
  reached, 
  this 
  ice, 
  notwithstanding 
  that 
  it 
  

   overwhelmed 
  such 
  islands 
  as 
  came 
  in 
  its 
  track, 
  issued 
  to 
  the 
  sea 
  ; 
  

   and 
  thus 
  it 
  is 
  that 
  the 
  gravel 
  /, 
  inosculating 
  with 
  c 
  and 
  e 
  up 
  both 
  

   the 
  channel 
  of 
  the 
  Lea, 
  in 
  Sheet 
  1, 
  and 
  the 
  channel 
  of 
  the 
  Colne 
  in 
  

   Sheet 
  7, 
  is 
  all 
  one 
  with 
  that 
  gravel 
  — 
  passing 
  in 
  both 
  channels 
  as 
  c 
  

   under, 
  and 
  as 
  e 
  over, 
  the 
  Chalky 
  Clay, 
  as 
  described 
  in 
  the 
  case 
  of 
  the 
  

   Colne 
  in 
  the 
  first 
  part 
  of 
  this 
  memoir 
  (p. 
  508). 
  

  

  Making 
  use 
  of 
  the 
  Survey 
  maps 
  so 
  far 
  as 
  available, 
  rather 
  than 
  

   my 
  own, 
  as 
  free 
  from 
  the 
  objection 
  of 
  having 
  been 
  constructed 
  in 
  

   accordance 
  with 
  my 
  views, 
  I, 
  for 
  a 
  similar 
  reason, 
  avail 
  myself 
  of 
  the 
  

   section 
  given 
  by 
  Prof. 
  Hughes 
  in 
  his 
  paper 
  on 
  the 
  two 
  plains 
  of 
  

   gravel 
  in 
  Herts 
  in 
  the 
  twenty-fourth 
  volume 
  of 
  the 
  Journal 
  (p. 
  284), 
  

   in 
  further 
  illustration 
  of 
  this 
  part 
  of 
  the 
  case. 
  

  

  Cut 
  ii. 
  — 
  Section 
  from 
  Prof. 
  Hughes's 
  paper 
  

   Line 
  AX 
  on 
  Map 
  3, 
  PL 
  XXV. 
  

  

  s 
  

  

  Inland 
  in 
  

   .Map 
  3. 
  

  

  a. 
  " 
  Boulder-clay 
  " 
  (the 
  Chalky 
  Clay, 
  c. 
  " 
  Pebble-gravel 
  of 
  Higher 
  Plain 
  ; 
  

   d, 
  of 
  my 
  figures). 
  large 
  percentage 
  of 
  quartz 
  " 
  (older 
  

  

  b. 
  " 
  Subangular 
  gravel, 
  sand, 
  and 
  part 
  of 
  c 
  of 
  my 
  figures). 
  

   loam 
  of 
  Lower 
  Plain, 
  with 
  boulder- 
  d. 
  " 
  Chalk 
  and 
  Tertiaries." 
  

   [chalky] 
  clay 
  under 
  it, 
  in 
  it, 
  and 
  on 
  

  

  it 
  " 
  (c 
  and 
  e 
  of 
  my 
  figures). 
  

  

  N.P>. 
  In 
  Prof. 
  Hughes's 
  paper 
  the 
  points 
  of 
  the 
  compass 
  at 
  the 
  ends 
  of 
  the 
  

   section 
  are 
  by 
  inadvertence 
  reversed. 
  

  

  The 
  line 
  of 
  this 
  section 
  is 
  shown 
  on 
  Map 
  3 
  by 
  that 
  marked 
  A 
  N", 
  

   and 
  is 
  in 
  the 
  part 
  where 
  c, 
  e, 
  and 
  /thus 
  inosculate 
  as 
  "gravel 
  of 
  

   the 
  lower 
  plain 
  ;" 
  and 
  Prof. 
  Hughes, 
  in 
  his 
  description, 
  observes 
  that 
  

   the 
  gravel 
  of 
  his 
  lower 
  plain 
  (b 
  of 
  his 
  section, 
  and 
  the 
  newer 
  part 
  

   of 
  c 
  of 
  this 
  memoir), 
  which 
  is 
  that 
  of 
  the 
  channel 
  (the 
  gravel 
  of 
  the 
  

   higher 
  plain 
  being 
  that 
  on 
  the 
  islands, 
  viz. 
  the 
  earliest 
  part 
  of 
  c 
  of 
  this 
  

   memoir, 
  which 
  had 
  emerged 
  before 
  the 
  ice 
  reached 
  it), 
  has 
  the 
  Chalky 
  

  

  * 
  See 
  the 
  reference 
  to 
  and 
  explanation 
  of 
  maps 
  and 
  sections 
  at 
  the 
  end 
  of 
  

   the 
  memoir. 
  

  

  