﻿730 
  SEARLES 
  V. 
  WOOD 
  ON 
  THE 
  NEWER 
  

  

  The 
  bed 
  corresponding 
  to 
  this 
  over 
  y 
  in 
  fig. 
  LIV. 
  is 
  only 
  about 
  a 
  

   foot 
  thick, 
  and 
  is 
  wholly 
  composed 
  of 
  fragments 
  of 
  the 
  limestone 
  worn 
  

   flat 
  ; 
  and 
  though 
  the 
  bed 
  y 
  does 
  not 
  occur 
  over 
  the 
  gravel 
  of 
  that 
  

   district 
  which 
  corresponds 
  to 
  that 
  in 
  the 
  Casewick 
  cutting 
  (gravel 
  

   and 
  sand 
  not 
  favouring 
  the 
  formation 
  of 
  that 
  bed), 
  this 
  band 
  of 
  flat 
  frag- 
  

   ments 
  does 
  so 
  occur 
  in 
  all 
  the 
  sections 
  of 
  gravel 
  I 
  met 
  with, 
  equally 
  

   with 
  those 
  in 
  which 
  the 
  bed 
  y 
  appeared 
  ; 
  and 
  this 
  on 
  higher 
  and 
  

   lower 
  elevations 
  alike, 
  and 
  quite 
  irrespective 
  of 
  valley 
  configuration. 
  

   It 
  appears 
  to 
  me 
  therefore 
  that 
  while 
  in 
  the 
  valley 
  of 
  the 
  Gipsey 
  

   Race 
  this 
  flooding 
  swept 
  down 
  these 
  flattened 
  fragments 
  in 
  quan- 
  

   tity 
  sufficient 
  to 
  accumulate 
  a 
  bed 
  several 
  feet 
  thick, 
  in 
  the 
  open 
  

   country 
  and 
  on 
  the 
  low 
  plateaux 
  it 
  accumulated 
  them 
  in 
  quantity 
  

   only 
  sufficient 
  to 
  form 
  this 
  band 
  a 
  foot 
  or 
  so 
  thick 
  *. 
  To 
  flatten 
  

   fragments 
  in 
  this 
  way, 
  the 
  agent 
  must 
  have 
  carried 
  them 
  over 
  the 
  

   surface 
  without 
  rolling 
  them 
  ; 
  and 
  I 
  can 
  only 
  conjecture, 
  for 
  want 
  

   of 
  a 
  better 
  explanation, 
  that 
  to 
  do 
  so 
  the 
  rain 
  must 
  have 
  been 
  so 
  

   excessive 
  as 
  to 
  have 
  formed 
  a 
  sheet 
  of 
  water 
  some 
  inches 
  thick 
  over 
  

   the 
  general 
  surface, 
  which, 
  while 
  sufficient 
  to 
  impart 
  motion 
  to 
  the 
  

   fragments, 
  was 
  insufficient 
  to 
  roll 
  them, 
  but 
  which, 
  as 
  it 
  drained 
  

   from 
  the 
  general 
  surface 
  into 
  valleys, 
  swept 
  the 
  flattened 
  fragments 
  

   in 
  volume 
  into 
  these 
  valleys, 
  thus 
  giving 
  rise 
  to 
  the 
  gravel 
  oh 
  in 
  

   fig.L. 
  

  

  Whatever 
  may 
  be 
  the 
  true 
  explanation, 
  however, 
  the 
  beds 
  01 
  

   flattened 
  fragments 
  occupy 
  precisely 
  the 
  same 
  successional 
  position 
  to 
  

   the 
  atmospheric 
  formation, 
  y, 
  and 
  to 
  the 
  sands, 
  Fy, 
  which 
  I 
  regard 
  

   as 
  synchronous 
  with 
  it, 
  that 
  the 
  brickearth 
  overlying 
  the 
  gravel 
  a 
  

   does 
  to 
  the 
  river-formation, 
  viz. 
  that 
  gravel 
  which 
  is 
  synchronous 
  with 
  

   y 
  and 
  Ty. 
  It 
  follows 
  the 
  irregular 
  surface 
  of 
  y 
  under 
  the 
  humus. 
  

  

  The 
  gravel 
  marked 
  yli 
  in 
  fig. 
  XLIIL, 
  and 
  shown 
  as 
  overlying 
  the; 
  

   Hessle 
  Clay 
  in 
  the 
  Humber 
  gorge 
  at 
  Ferriby, 
  is 
  probably 
  of 
  similar 
  

   origin 
  ; 
  for 
  it 
  contains 
  many 
  of 
  the 
  flat 
  fragments 
  of 
  hard 
  chalk, 
  

   and 
  patches 
  of 
  it 
  occur 
  over 
  the 
  Hessle 
  Clay 
  along 
  the 
  low 
  ground 
  

   east 
  of 
  the 
  Wold 
  in 
  Sheets 
  85 
  and 
  86 
  ; 
  but 
  with 
  this 
  exception, 
  

   and 
  that 
  of 
  the 
  very 
  few 
  and 
  sporadic 
  occurrences 
  shown 
  under 
  the 
  

   letters 
  Ty 
  in 
  figs. 
  XLVII. 
  and 
  XLIX.,and 
  the 
  continuous 
  sheet 
  shown 
  

   under 
  the 
  same 
  letters 
  which 
  extends 
  from 
  the 
  edge 
  of 
  the 
  Hessle 
  

   Clay 
  to 
  Bridlington 
  (fig. 
  L.), 
  all 
  of 
  which 
  I 
  have 
  referred 
  to 
  the 
  

   effluent 
  water 
  of 
  the 
  Hessle-Clay 
  ice, 
  no 
  gravel 
  or 
  other 
  accumulation 
  

   posterior 
  to 
  the 
  Hessle 
  Clay 
  in 
  Lincolnshire 
  or 
  Yorkshire 
  occurs 
  but 
  

   what 
  seems 
  to 
  be 
  of 
  freshwater 
  origin. 
  These 
  beds. 
  are 
  shown 
  in 
  

   figs. 
  XLYI. 
  and 
  XLIX.by 
  the 
  letter 
  7i; 
  but 
  the 
  only 
  instance, 
  if 
  indeed 
  

   that 
  be 
  one, 
  in 
  which 
  along 
  the 
  Holderness 
  coast 
  they 
  yield 
  fossils 
  is, 
  

   so 
  far 
  as 
  I 
  am 
  aware, 
  that 
  of 
  Hornsea, 
  in 
  fig. 
  XLIX. 
  At 
  that 
  place, 
  

   near 
  the 
  railway-station, 
  a 
  gravel, 
  very 
  oblique-bedded, 
  alternates 
  

   with 
  thin 
  seams 
  of 
  loam, 
  in 
  which 
  freshwater 
  shells 
  occur; 
  and 
  

   there 
  we 
  seem 
  to 
  get 
  an 
  instance 
  of 
  that 
  annual 
  flooding 
  to 
  which 
  

  

  * 
  The 
  angular 
  drift 
  recently 
  described 
  by 
  Prof. 
  Prestwich 
  to 
  the 
  Society 
  as 
  

   covering 
  the 
  Lower-Chalk 
  plain 
  between 
  Didcot 
  and 
  Chilton, 
  containing 
  reindeer 
  

   and 
  other 
  mammalian 
  remains 
  and 
  land-shells, 
  seems 
  to 
  me 
  to 
  correspond 
  

   either 
  with 
  this 
  flooding, 
  or 
  with 
  the 
  atmospheric 
  formation 
  already 
  described. 
  

  

  