﻿IN 
  THE 
  COtfTOETED 
  DEIFT 
  OF 
  CEOMEE. 
  

  

  227 
  

  

  Tellina 
  balthica 
  ; 
  but 
  I 
  consider, 
  with 
  Messrs. 
  H. 
  B. 
  Woodward, 
  J. 
  H. 
  

   Blake, 
  and 
  Clement 
  B-eid, 
  that 
  the 
  presence 
  of 
  this 
  one 
  shell 
  is 
  an 
  

   unsatisfactory 
  test 
  of 
  the 
  climate 
  being 
  glacial. 
  JSTo 
  doubt 
  the 
  

   climate 
  was 
  gradually 
  changing 
  ; 
  but 
  I 
  could 
  see 
  no 
  evidence 
  of 
  ice- 
  

   action 
  below 
  the 
  till. 
  The 
  generally 
  undisturbed 
  nature 
  of 
  the 
  Crag- 
  

   beds 
  negatives 
  the 
  supposition. 
  

  

  Description 
  of 
  the 
  Cromer 
  Till 
  and 
  Contorted 
  Drift. 
  

  

  The 
  lower 
  part 
  of 
  the 
  Cromer 
  Till 
  is, 
  in 
  places, 
  stratified. 
  This 
  

   I 
  distinctly 
  noticed 
  in 
  more 
  than 
  one 
  place 
  ; 
  and 
  it 
  is 
  shown 
  in 
  the 
  

   section 
  taken 
  at 
  right 
  angles 
  to 
  the 
  shore 
  (fig. 
  5, 
  a) 
  between 
  Sher- 
  

   ringham 
  and 
  Cromer. 
  In 
  another 
  place 
  I 
  noticed 
  that 
  the 
  till 
  rested 
  

  

  Fig. 
  5. 
  — 
  Section 
  cut 
  out 
  by 
  a 
  Stream 
  at 
  right 
  angles 
  to 
  the 
  shore 
  

   between 
  Cromer 
  and 
  Sherringham. 
  

  

  a. 
  Stratified 
  till. 
  

  

  b. 
  Unstratified 
  till. 
  

  

  c. 
  Nest 
  of 
  gravel. 
  

  

  d. 
  Contorted 
  sands 
  and 
  gravels. 
  

  

  upon 
  white 
  stratified 
  sand 
  ; 
  and 
  also 
  at 
  a 
  point 
  near 
  Sherringham 
  an 
  

   eroded 
  surface 
  of 
  black 
  loam 
  was 
  capped 
  by 
  red 
  gravel. 
  It 
  is 
  not 
  easy 
  

   always 
  to 
  distinguish 
  between 
  the 
  preglacial 
  beds 
  and 
  the 
  incoming 
  

   glacial, 
  especially 
  when 
  the 
  base 
  of 
  the 
  cliffs 
  is 
  encumbered 
  with 
  

   talus 
  ; 
  and 
  even 
  where 
  a 
  vertical 
  face 
  is 
  to 
  be 
  found, 
  if 
  not 
  perfectly 
  

   fresh, 
  it 
  frequently 
  gets 
  washed 
  over 
  with 
  sand 
  from 
  above, 
  rendering 
  

   it 
  necessary 
  to 
  scrape 
  it 
  down 
  before 
  its 
  nature 
  can 
  be 
  disclosed. 
  Mr. 
  

   J. 
  H. 
  Blake 
  says*, 
  " 
  Where 
  the 
  unstratified 
  rootlet-bed 
  is 
  to 
  be 
  seen, 
  

   this 
  line 
  is 
  very 
  marked 
  ; 
  but 
  where 
  the 
  rootlet-bed 
  has 
  been 
  en- 
  

   tirely 
  denuded, 
  it 
  is 
  frequently 
  not 
  so 
  well 
  marked, 
  from 
  that 
  and 
  

   the 
  following 
  reasons. 
  There 
  are 
  sometimes 
  sands 
  &c. 
  immediately 
  

   above 
  and 
  below 
  this 
  bed 
  of 
  a 
  similar 
  colour 
  and 
  nature, 
  which, 
  when 
  

   the 
  bed 
  itself 
  is 
  entirely 
  denuded, 
  come 
  together 
  and 
  give 
  an 
  ap- 
  

   pearance 
  of 
  a 
  break 
  in 
  the 
  series." 
  The 
  till 
  may 
  therefore 
  be 
  

   described 
  as 
  sometimes 
  passing 
  down 
  into 
  semistratified 
  beds, 
  itself 
  

   being 
  usually 
  unstratified, 
  but 
  occasionally 
  partially 
  so, 
  as 
  we 
  see 
  

   is 
  also 
  the 
  case 
  with 
  the 
  marine 
  Boulder-clays 
  of 
  West 
  Lancashire. 
  

   Upwards 
  it 
  usually 
  passes 
  into 
  the 
  Contorted 
  Drift 
  in 
  an 
  indescri- 
  

   bably 
  confused 
  sort 
  of 
  manner, 
  but 
  occasionally 
  displays 
  a 
  very 
  

  

  * 
  Presidential 
  Address, 
  Norwich 
  Geol. 
  Soc, 
  Session 
  1879-80, 
  p. 
  147. 
  

  

  