﻿478 
  PROF. 
  J. 
  W. 
  JT7DD 
  ON 
  THE 
  EOCENE 
  AND 
  OLIGOCENE 
  

  

  Brockenhurst 
  series 
  can 
  be 
  traced. 
  In 
  the 
  banks 
  of 
  tLe 
  stream 
  

   called 
  the 
  Dark 
  Water, 
  near 
  the 
  village 
  of 
  Langley, 
  and 
  again 
  in 
  

   the 
  sides 
  of 
  the 
  Beaulieu 
  river, 
  just 
  below 
  the 
  town 
  of 
  Beaulieu, 
  

   the 
  marine 
  strata 
  are 
  exposed, 
  where 
  the 
  great 
  plateaux 
  of 
  gravel 
  

   so 
  well 
  described 
  by 
  Mr. 
  Codrington 
  * 
  have 
  been 
  cut 
  through 
  by 
  

   the 
  streams. 
  At 
  the 
  latter 
  of 
  these 
  localities 
  a 
  brickyard 
  once 
  

   existed, 
  which 
  has 
  long 
  since 
  been 
  closed 
  and 
  the 
  pits 
  filled 
  in 
  f 
  . 
  I 
  

   have 
  been 
  able 
  to 
  collect 
  in 
  the 
  river-banks 
  the 
  very 
  characteristic 
  

   Voluta 
  geminata 
  and 
  other 
  fossils 
  of 
  the 
  Brockenhurst 
  scries. 
  

   We 
  meet 
  with 
  no 
  further 
  traces 
  of 
  them, 
  however, 
  till 
  we 
  come 
  to 
  

   the 
  valley 
  of 
  the 
  Lymington 
  river, 
  at 
  Eoydon 
  and 
  Brockenhurst 
  and 
  

   the 
  localities 
  in 
  the 
  immediai 
  e 
  neighbourhood 
  of 
  Lyndhurst. 
  We 
  have 
  

   no 
  means 
  of 
  determining 
  the 
  total 
  thickness 
  of 
  the 
  Brockenhurst 
  series 
  

   in 
  the 
  New 
  Forest; 
  but 
  at 
  Roy 
  don 
  and 
  near 
  Lyndhurst 
  it 
  certainly 
  

   exceeds 
  2d 
  feet 
  J. 
  

  

  III. 
  The 
  Correlation 
  of 
  the 
  Strata 
  of 
  Headon 
  Hill 
  and 
  Col-well 
  Bay. 
  

  

  While 
  the 
  order 
  of 
  succession 
  of 
  the 
  strata 
  as 
  seen 
  in 
  White- 
  

   cliff 
  Bay 
  at 
  the 
  eastern 
  end 
  of 
  the 
  Isle 
  of 
  Wight 
  is 
  clear 
  and 
  un- 
  

   disputed, 
  such 
  is 
  far 
  from 
  being 
  the 
  case 
  at 
  Colwell 
  Bay 
  and 
  Headon 
  

   Hill, 
  at 
  the 
  western 
  end 
  of 
  the 
  island 
  : 
  the 
  strata 
  containing 
  the 
  

   peculiar 
  fauna 
  of 
  the 
  Brockenhurst 
  series 
  appear, 
  at 
  first 
  sight, 
  to 
  

   be 
  entirely 
  wanting 
  at 
  these 
  localities 
  ; 
  certainly 
  no 
  trace 
  of 
  such 
  

   a 
  formation 
  can 
  be 
  detected 
  in 
  the 
  position 
  assigned 
  to 
  it 
  by 
  Messrs. 
  

   Keeping 
  and 
  Tawney, 
  namely 
  at 
  the 
  base 
  of 
  the 
  so-called 
  "Middle 
  

   Headon." 
  If, 
  then, 
  we 
  accept 
  the 
  interpretation 
  of 
  these 
  authors, 
  

   we 
  must 
  believe 
  that 
  while 
  the 
  Brockenhurst 
  beds 
  are 
  well 
  developed 
  

   both 
  at 
  Whitecliff 
  Bay 
  and 
  in 
  the 
  New 
  Forest, 
  they 
  are 
  wholly 
  

   wanting 
  at 
  the 
  intermediate 
  localities. 
  

  

  But 
  another 
  explanation 
  of 
  the 
  facts 
  of 
  the 
  case 
  has 
  been 
  sug- 
  

   gested 
  by 
  M. 
  von 
  Konen 
  and 
  myself. 
  The 
  brackish-water 
  beds 
  of 
  

   Colwell 
  Bay 
  yield 
  a 
  number 
  of 
  characteristic 
  Brockenhurst 
  fossils 
  ; 
  

   and 
  we 
  have 
  therefore 
  been 
  led 
  to 
  regard 
  these 
  Colwell-Bay 
  beds 
  as 
  

   the 
  brackish-water 
  representatives 
  of 
  the 
  Brockenhurst 
  series, 
  though 
  

   we 
  admit 
  that 
  in 
  the 
  New 
  Forest 
  they 
  have 
  a 
  " 
  richer 
  and 
  true 
  

   marine 
  fauna" 
  §. 
  

  

  But 
  it 
  has 
  been 
  maintained 
  that 
  the 
  brackish-water 
  beds 
  of 
  Col- 
  

   well 
  Bay 
  are 
  clearly 
  identical 
  and 
  continuous 
  with 
  the 
  so-called 
  

   Middle 
  Headon 
  of 
  Headon 
  Hill. 
  On 
  this 
  point 
  the 
  greatest 
  diversity 
  

   of 
  opinion 
  has 
  long 
  existed. 
  Prof. 
  Hebert 
  and 
  Dr. 
  W 
  T 
  right 
  be- 
  

   lieved 
  the 
  brackish-water 
  beds 
  of 
  Colwell 
  Bay 
  and 
  Headon 
  Hill 
  

   respectively 
  to 
  be 
  on 
  different 
  horizons 
  ; 
  and 
  Mr. 
  G. 
  B. 
  Sowerby, 
  

   Prof. 
  Sedgwick, 
  and 
  Prof. 
  Edward 
  Porbes 
  all 
  admit 
  that 
  there 
  are 
  

  

  * 
  Quart. 
  Journ. 
  Gaol. 
  Soc. 
  vol. 
  xxvi. 
  (1870) 
  p. 
  528. 
  

  

  t 
  An 
  account 
  of 
  some 
  of 
  these 
  New-Forest 
  sections 
  was 
  given 
  by 
  Mr. 
  J. 
  C. 
  

   Moore, 
  Quart, 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  v. 
  (1849) 
  p. 
  315. 
  

  

  | 
  Although 
  the 
  whole 
  of 
  the 
  fluvio-marine 
  beds 
  of 
  the 
  New 
  Forest 
  are 
  coloured 
  

   by 
  the 
  Geological 
  Survey 
  as 
  belonging 
  to 
  the 
  Headon 
  series, 
  there 
  can 
  be 
  little 
  

   doubt 
  that 
  a 
  considerable 
  portion 
  of 
  them 
  belongs 
  to 
  the 
  Bembridge 
  series. 
  

  

  § 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xx. 
  (1864) 
  p. 
  98. 
  

  

  