﻿THANET 
  BEDS 
  AND 
  CRAG 
  AT 
  SUDBURY, 
  SUFFOLK. 
  405 
  

  

  the 
  most 
  common 
  being 
  Oardium 
  angustatum, 
  a 
  species 
  hitherto 
  

   found 
  in 
  Crag 
  only, 
  as 
  I 
  am 
  informed 
  by 
  Mr. 
  S. 
  V. 
  Wood, 
  who 
  has 
  

   kindly 
  examined 
  my 
  Sudbury 
  fossils, 
  which 
  he 
  regards 
  as 
  belonging 
  

   to 
  the 
  Crag 
  rather 
  than 
  to 
  the 
  Drift. 
  

  

  Discussion. 
  

  

  Mr. 
  Prestwich 
  said 
  that 
  he 
  was 
  quite 
  prepared 
  to 
  accept 
  Mr. 
  

   Whitaker's 
  interpretation 
  of 
  the 
  beds 
  referred 
  to 
  the 
  Thanet 
  Sand. 
  

  

  Rev. 
  Mr. 
  Timins 
  remarked 
  that 
  the 
  presence 
  of 
  ironstone 
  did 
  not 
  

   prove 
  the 
  beds 
  in 
  which 
  it 
  occurs 
  to 
  belong 
  to 
  the 
  Red 
  Crag. 
  

  

  Mr. 
  Gwyn 
  Jeffreys 
  said 
  that 
  the 
  limits 
  of 
  the 
  Red 
  Crag 
  were 
  

   not 
  easy 
  to 
  determine, 
  and 
  that 
  the 
  casts 
  of 
  shells 
  obtained 
  in 
  the 
  

   beds 
  near 
  Sudbury 
  were 
  not 
  sufficient 
  to 
  prove 
  the 
  exact 
  position 
  to 
  

   which 
  they 
  should 
  be 
  referred, 
  although 
  they 
  represented 
  Crag 
  

   species. 
  

  

  Mr. 
  Seeley 
  stated 
  that 
  he 
  had 
  seen 
  fine 
  sections 
  of 
  Thanet 
  Sands 
  

   fully 
  20 
  feet 
  thick 
  at 
  Hadleigh 
  sixteen 
  years 
  ago. 
  They 
  contained 
  

   sharks' 
  teeth. 
  The 
  sands 
  were 
  capped 
  with 
  pebbles, 
  and 
  above 
  

   these 
  with 
  London 
  Clay. 
  The 
  Reading 
  Beds 
  either 
  almost 
  thin 
  out 
  

   to 
  the 
  north 
  or 
  are 
  changed 
  to 
  sands 
  at 
  Hadleigh. 
  This 
  would 
  give 
  

   the 
  Thanet 
  Sands 
  a 
  more 
  northern 
  extension. 
  

  

  Mr. 
  Charlesworth 
  inquired 
  as 
  to 
  the 
  number 
  of 
  species 
  that 
  

   could 
  be 
  identified 
  with 
  true 
  Red-Crag 
  fossils. 
  He 
  thought 
  that 
  

   the 
  presence 
  of 
  phosphatic 
  nodules 
  was 
  confirmatory 
  of 
  the 
  beds 
  

   belonging 
  to 
  either 
  the 
  Red 
  or 
  the 
  Mammaliferous 
  Crag. 
  

  

  Mr. 
  Godwin- 
  Austen 
  remarked 
  that 
  the 
  occurrence 
  of 
  Thanet 
  

   Sands 
  at 
  Sudbury 
  was 
  a 
  fact 
  of 
  much 
  geological 
  interest. 
  

  

  Prof. 
  Ramsay 
  considered 
  that 
  freshwater 
  conditions 
  generally 
  

   succeed 
  marine, 
  and 
  that 
  the 
  submergence 
  of 
  the 
  Chalk 
  areas 
  was 
  

   followed 
  by 
  upheaval 
  of 
  land. 
  

  

  Prof. 
  Hughes 
  thought 
  that 
  the 
  base 
  of 
  the 
  Thanet 
  Sands 
  could 
  

   not 
  represent 
  a 
  land-surface, 
  but 
  that 
  there 
  had 
  been 
  land 
  in 
  the 
  

   neighbourhood, 
  which 
  gave 
  rise 
  to 
  fluviatile 
  conditions. 
  

  

  Mr. 
  Whitaker, 
  in 
  reply, 
  said 
  that 
  the 
  beds 
  at 
  Hadleigh, 
  referred 
  

   to 
  by 
  Mr. 
  Seeley, 
  belonged 
  to 
  the 
  basement-becl 
  of 
  the 
  London 
  Clay, 
  

   being 
  above 
  the 
  Reading 
  Beds. 
  He 
  maintained 
  that 
  the 
  balance 
  of 
  

   probabilities 
  was 
  in 
  favour 
  of 
  the 
  beds 
  referred 
  by 
  him 
  to 
  the 
  Red 
  

   Craa; 
  being 
  of 
  that 
  age 
  rather 
  than 
  Drift. 
  

  

  