﻿IN 
  THE 
  CONTORTED 
  DRIFT 
  OF 
  CROMER. 
  237 
  

  

  it, 
  combinedly 
  forming 
  a 
  raft 
  quite 
  capable 
  of 
  floating 
  away 
  any 
  

   boulders 
  we 
  are 
  acquainted 
  with. 
  That 
  the 
  natural 
  incline 
  of 
  the 
  

   shore, 
  aided 
  by 
  the 
  rise 
  and 
  fall 
  of 
  the 
  tides, 
  on 
  the 
  breaking 
  up 
  of 
  

   the 
  ice 
  at 
  the 
  approach 
  of 
  summer, 
  would 
  be 
  equal 
  to 
  launching 
  

   into 
  the 
  sea 
  the 
  entire 
  raft, 
  which 
  has 
  probably 
  in 
  most 
  cases 
  floated 
  

   off 
  in 
  water 
  not 
  more 
  than 
  a 
  couple 
  of 
  hundred 
  feet 
  deep. 
  The 
  

   whole 
  arrangement 
  of 
  the 
  bank 
  and 
  the 
  materials 
  of 
  which 
  it 
  is 
  com- 
  

   posed 
  appear 
  to 
  me 
  to 
  point 
  to 
  shallow-water 
  conditions 
  during 
  its 
  

   formation. 
  

  

  The 
  masses 
  of 
  Marlstone 
  Eock-bed 
  on 
  the 
  west 
  side 
  of 
  the 
  Oolitic 
  

   escarpment 
  have 
  probably, 
  as 
  pointed 
  out 
  by 
  Professor 
  Judd, 
  been 
  

   derived 
  from 
  the 
  highest 
  points, 
  in 
  which 
  case 
  they 
  would 
  be 
  floated 
  

   into 
  as 
  much 
  as 
  600 
  feet 
  of 
  water 
  ; 
  one 
  of 
  them 
  is 
  stranded 
  on 
  Beacon 
  

   Hill. 
  They 
  appear 
  to 
  be 
  isolated 
  objects, 
  such 
  as 
  we 
  should 
  expect 
  if 
  

   they 
  foundered 
  in 
  deep 
  water 
  without 
  stranding, 
  through 
  the 
  melting 
  

   of 
  the 
  ice 
  raft 
  and 
  consequent 
  insufficiency 
  of 
  flotation-power. 
  But 
  

   the 
  frequency 
  of 
  these 
  boulders 
  and 
  their 
  accumulation 
  in 
  the 
  Cromer 
  

   drift 
  points 
  to 
  their 
  progress 
  having 
  been 
  arrested 
  by 
  the 
  shoaling 
  

   of 
  the 
  water 
  and 
  by 
  stranding 
  on 
  a 
  submarine 
  bank. 
  

  

  Discussion. 
  

  

  Dr. 
  Gwyn 
  Jeffreys 
  asked 
  if 
  the 
  author 
  had 
  named 
  the 
  shells 
  

   found, 
  and 
  pointed 
  out 
  the 
  desirability 
  of 
  their 
  being 
  examined, 
  

   especially 
  with 
  respect 
  to 
  Tellina 
  bdlthica. 
  

  

  The 
  President 
  stated 
  that 
  Mr. 
  Clement 
  Eeid 
  had 
  carefully 
  col- 
  

   lected 
  all 
  the 
  shells 
  of 
  these 
  beds, 
  and 
  that 
  they 
  would 
  be 
  described 
  

   in 
  a 
  memoir 
  of 
  the 
  Geological 
  Survey. 
  

  

  Mr. 
  Evans 
  expressed 
  his 
  interest 
  in 
  the 
  paper, 
  and 
  his 
  admiration 
  

   of 
  the 
  care 
  with 
  which 
  the 
  author's 
  conclusions 
  had 
  been 
  worked 
  out. 
  

   He 
  referred 
  to 
  the 
  Chalk 
  of 
  the 
  Eoslyn 
  Pit 
  near 
  Ely, 
  and 
  to 
  masses 
  

   of 
  transported 
  Boulder-clay 
  imbedded 
  in 
  softer 
  material 
  already 
  

   deposited. 
  

  

  Prof. 
  Judd 
  said 
  he 
  agreed 
  with 
  the 
  author 
  in 
  believing 
  that 
  such 
  

   enormous 
  transported 
  masses 
  must 
  have 
  been 
  conveyed 
  by 
  floating 
  

   shore-ice, 
  and 
  could 
  not 
  have 
  been 
  carried 
  by 
  any 
  form 
  of 
  land-ice 
  

   or 
  iceberg, 
  

  

  Mr. 
  Drew 
  thought 
  that 
  the 
  author's 
  views 
  were 
  well 
  worthy 
  of 
  

   consideration. 
  He 
  had 
  himself 
  seen 
  in 
  Tibet 
  spring-water 
  accu- 
  

   mulating 
  and 
  freezing 
  till 
  it 
  formed 
  masses 
  of 
  ice 
  many 
  acres 
  in 
  

   extent 
  and 
  from 
  8 
  to 
  10 
  feet 
  thick, 
  which 
  appeared 
  to 
  last 
  all 
  through 
  

   the 
  summer. 
  

  

  Eev. 
  E. 
  Hill 
  found 
  it 
  difficult 
  to 
  understand 
  how 
  the 
  rock- 
  

   masses 
  could 
  be 
  separated 
  from 
  cliffs 
  without 
  being 
  overturned. 
  

  

  Prof. 
  Hughes 
  said 
  that 
  he 
  had 
  himself 
  seen 
  agencies 
  at 
  work 
  

   in 
  this 
  country 
  which, 
  on 
  a 
  slightly 
  larger 
  scale, 
  would 
  explain 
  

   all 
  the 
  phenomena 
  described 
  by 
  the 
  author. 
  In 
  the 
  landslips 
  near 
  

   Lyme 
  Eegis, 
  in 
  the 
  Isle 
  of 
  Sheppey, 
  and 
  along 
  the 
  river 
  Clwyd, 
  

   masses 
  of 
  rock 
  and 
  drift 
  slide 
  down 
  without 
  being 
  much 
  disturbed, 
  

   and 
  often 
  remain 
  right 
  side 
  up. 
  Then, 
  as 
  to 
  transport, 
  he 
  had 
  seen 
  

  

  