﻿070 
  

  

  SEAELES 
  V. 
  WOOD 
  ON 
  THE 
  NEWER 
  

  

  poured 
  their 
  waters 
  into 
  the 
  wide 
  

   expanse 
  of 
  flat 
  country 
  aronnd 
  

   the 
  Fen 
  into 
  which 
  these 
  other 
  

   four 
  valleys 
  opened. 
  On 
  the 
  parts 
  

   vacated 
  by 
  the 
  ice 
  in 
  its 
  retreat 
  

   which 
  were 
  above 
  the 
  sea-level, 
  

   swamps 
  and 
  marsh-accumulations 
  

   formed, 
  in 
  which 
  were 
  preserved 
  

   the 
  shells 
  of 
  freshwater 
  Mollusca 
  ; 
  

   and 
  one 
  of 
  these, 
  within 
  the 
  

   Well 
  and 
  system, 
  was 
  disclosed 
  in 
  

   the 
  making 
  of 
  the 
  cutting 
  at 
  

   Casewick 
  on 
  the 
  Great 
  Northern 
  

   Railway 
  (in 
  the 
  north 
  centre 
  

   of 
  sheet 
  64), 
  and 
  is 
  described 
  by 
  

   Prof. 
  Morris 
  in 
  the 
  ninth 
  volume 
  

   of 
  the 
  Journal. 
  It 
  lies 
  at 
  an 
  ele- 
  

   vation 
  of 
  about 
  110 
  feet 
  above 
  

   0. 
  D., 
  and 
  crowns 
  the 
  parting 
  

   which 
  separates 
  the 
  vallej' 
  of 
  a 
  riv- 
  

   ulet 
  tributary 
  of 
  the 
  Welland, 
  from 
  

   that 
  of 
  a 
  tributary 
  of 
  the 
  Glen 
  (a 
  

   small 
  river 
  which 
  falls 
  into 
  the 
  

   Welland 
  near 
  the 
  AVash), 
  and 
  is 
  

   overlain 
  and 
  overlapped 
  by 
  a 
  sheet 
  

   of 
  gravel 
  which 
  has 
  been 
  cut 
  off 
  by 
  

   denudation 
  in 
  the 
  direction 
  of 
  either 
  

   valley. 
  By 
  permission 
  of 
  Prof. 
  

   Morris, 
  and 
  of 
  the 
  Council, 
  I 
  here 
  

   give 
  that 
  section 
  (Cut 
  i.). 
  

  

  When 
  the 
  ice 
  of 
  the 
  Chalky 
  Clay 
  

   was 
  at 
  its. 
  greatest 
  extension, 
  and 
  

   the 
  Pen 
  country 
  deeply 
  buried 
  

   under 
  it 
  (see 
  map 
  of 
  the 
  Chalky 
  

   Clay 
  accompanying 
  first 
  part 
  of 
  

   this 
  memoir, 
  Q. 
  J. 
  G. 
  S. 
  vol. 
  xxxvi. 
  

   pi. 
  xxi. 
  Map 
  1), 
  the 
  site 
  of 
  Case- 
  

   wick 
  cutting 
  was 
  of 
  course 
  buried 
  

   under 
  that 
  ice, 
  and 
  the 
  Oolitic 
  

   strata 
  on 
  which 
  the 
  fresh 
  water 
  bed 
  

   rests 
  were 
  undergoing 
  degradation 
  

   by 
  it 
  ; 
  but 
  as 
  the 
  ice 
  retreated 
  this 
  

   site 
  was 
  left 
  as 
  a 
  low 
  eminence 
  of 
  

   bare 
  rock, 
  the 
  drainage 
  flowing 
  

   through 
  the 
  lower 
  levels 
  beneath 
  

   it. 
  Upon 
  this 
  low 
  eminence, 
  just 
  

   out 
  of 
  the 
  water, 
  the 
  freshwater 
  

   deposit, 
  No. 
  3. 
  of 
  the 
  woodcut, 
  

   was 
  formed. 
  

  

  Although 
  the 
  ice 
  was 
  now 
  re- 
  

  

  020 
  

  

  3 
  p 
  

  

  °2 
  Pj 
  

  

  

  bd 
  

  

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