﻿486 
  PKOF. 
  J. 
  W. 
  JUDD 
  ON 
  THE 
  EOCENE 
  AND 
  OLIGOCENE 
  

  

  form 
  a 
  thin 
  and 
  very 
  inconstant 
  bed 
  in 
  the 
  midst 
  of 
  the 
  strata 
  con 
  - 
  

   taining 
  the 
  fossils 
  of 
  the 
  zone 
  of 
  Ceriihium 
  concavum. 
  

  

  At 
  "Whitecliff 
  Bay, 
  where 
  the 
  order 
  of 
  succession 
  is 
  clearly 
  

   exhibited, 
  the 
  brackish-water 
  bands 
  containing 
  the 
  fossils 
  of 
  the 
  

   zone 
  of 
  Ceriihium 
  concavum 
  are 
  absent, 
  but 
  the 
  Brockenhurst 
  beds 
  

   are 
  well 
  displayed 
  and 
  of 
  considerable 
  thickness. 
  At 
  Headon 
  Hill 
  

   the 
  zone 
  of 
  Ceriihium 
  concavum 
  is 
  well 
  seen, 
  but 
  the 
  Brockenhurst 
  

   beds 
  seem 
  to 
  be 
  altogether 
  wanting. 
  At 
  Colwell 
  Bay 
  there 
  occurs 
  

   a 
  series 
  of 
  beds 
  which 
  I 
  take 
  to 
  be 
  the 
  estuarine 
  representative 
  of 
  

   the 
  Brockenhurst 
  series, 
  but 
  which 
  my 
  critics 
  declare 
  to 
  be 
  only 
  

   the 
  zone 
  of 
  Cerithium 
  concavum 
  "with 
  a 
  somewhat 
  more 
  marine 
  

   character. 
  

  

  However 
  this 
  subsidiary 
  question 
  may 
  be 
  settled, 
  I 
  do 
  not 
  believe 
  

   that 
  the 
  main 
  facts 
  of 
  the 
  correlation 
  which 
  I 
  advocate 
  are 
  in 
  any 
  

   danger 
  of 
  being 
  impaired. 
  My 
  critics 
  have 
  altogether 
  failed 
  to 
  show 
  

   that, 
  at 
  any 
  point 
  in 
  the 
  Hampshire 
  basin, 
  beds 
  containing 
  the 
  charac- 
  

   teristic 
  fauna 
  of 
  the 
  zone 
  of 
  Cerithium 
  concavum 
  overlie 
  beds 
  contain- 
  

   ing 
  the 
  Brockenhurst 
  fauna 
  ; 
  and 
  on 
  the 
  Continent 
  the 
  latter 
  are 
  

   always 
  superimposed 
  upon 
  the 
  former. 
  My 
  critics 
  hold 
  that 
  between 
  

   the 
  New 
  Forest 
  localities 
  and 
  those 
  at 
  the 
  west 
  end 
  of 
  the 
  Isle 
  of 
  

   Wight 
  the 
  Brockenhurst 
  beds 
  have 
  thinned 
  away 
  or 
  passed 
  into 
  

   freshwater 
  deposits 
  : 
  my 
  contention 
  is, 
  that 
  they 
  appear 
  in 
  an 
  es- 
  

   tuarine 
  form 
  at 
  Colwell 
  Bay, 
  and 
  thin 
  out 
  or 
  graduate 
  into 
  fresh- 
  

   water 
  deposits 
  between 
  that 
  place 
  and 
  Headon 
  Hill. 
  

  

  In 
  conclusion, 
  I 
  must 
  point 
  out 
  that 
  the 
  vexed 
  question 
  of 
  the 
  order 
  

   of 
  succession 
  of 
  the 
  beds 
  at 
  Colwell 
  Bay 
  and 
  Headon 
  Hill 
  has 
  only 
  

   an 
  indirect 
  bearing 
  on 
  that 
  of 
  the 
  position 
  and 
  correlation 
  of 
  the 
  Oli- 
  

   gocene 
  strata 
  of 
  the 
  Hampshire 
  basin, 
  which 
  it 
  was 
  the 
  main 
  object 
  

   of 
  my 
  paper 
  to 
  establish. 
  If 
  my 
  interpretation 
  be 
  the 
  correct 
  one, 
  then 
  

   we 
  have 
  here, 
  as 
  I 
  pointed 
  out 
  in 
  my 
  previous 
  papsr, 
  an 
  additional 
  con- 
  

   firmation 
  of 
  the 
  succession 
  so 
  clearly 
  established 
  by 
  the 
  study 
  of 
  the 
  

   Whitecliff-Bay 
  section. 
  But 
  if, 
  on 
  the 
  other 
  hand, 
  the 
  views 
  advo- 
  

   cated 
  by 
  Messrs. 
  Keeping 
  and 
  Tawney 
  be 
  adopted, 
  it 
  adds 
  no 
  

   support 
  to 
  their 
  views 
  as 
  to 
  the 
  position 
  of 
  the 
  Brockenhurst 
  beds 
  ; 
  

   for 
  these 
  authors 
  admit 
  that 
  nothing 
  like 
  the 
  Brockenhurst 
  beds 
  can 
  

   be 
  detected 
  either 
  in 
  the 
  Colwell-Bay 
  or 
  Headon-Hill 
  section. 
  

  

  I 
  still 
  firmly 
  maintain 
  the 
  necessity 
  of 
  separating 
  these 
  beds 
  from 
  

   the 
  Upper 
  Eocene, 
  with 
  which 
  they 
  are 
  usually 
  grouped 
  by 
  English 
  

   authors. 
  The 
  Hempstead 
  series 
  of 
  the 
  Isle 
  of 
  Wight 
  is 
  the 
  

   undoubted 
  representative 
  of 
  the 
  Fontainebleau 
  sandstones, 
  a 
  forma- 
  

   tion 
  which 
  no 
  continental 
  geologist 
  would 
  think 
  of 
  grouping 
  in 
  the 
  

   Eocene. 
  Either 
  with 
  Lyell 
  and 
  Hebert 
  we 
  must 
  place 
  the 
  Hemp- 
  

   stead 
  beds 
  in 
  the 
  Lower 
  Miocene, 
  or 
  we 
  must 
  admit 
  the 
  term 
  Oligo- 
  

   cene 
  as 
  a 
  convenient 
  and 
  now 
  well-recognized 
  name 
  for 
  these 
  

   deposits 
  which 
  are 
  intermediate 
  in 
  age 
  between 
  the 
  Eocene 
  and 
  

   Miocene. 
  Nothing 
  could 
  possibly 
  be 
  more 
  detrimental 
  to 
  the 
  

   progress 
  of 
  geological 
  science 
  than 
  to 
  attempt 
  to 
  perpetuate 
  the 
  use 
  of 
  

   the 
  term 
  Eocene 
  in 
  a 
  sense 
  quite 
  distinct 
  from 
  that 
  in 
  which 
  it 
  is 
  

   employed 
  by 
  all 
  other 
  geologists, 
  alike 
  in 
  France, 
  Belgium, 
  Germany, 
  

   Switzerland, 
  and 
  Italy. 
  

  

  