﻿92 
  EEV. 
  W. 
  DOWNES 
  ON 
  THE 
  BLACKDOWN 
  BEDS. 
  

  

  Eocogyra 
  abound 
  throughout 
  the 
  bed, 
  and 
  Pecten 
  quadricostatus 
  is 
  

   found 
  frequently. 
  Mr. 
  Yicary 
  has 
  also 
  the 
  following 
  : 
  — 
  

  

  Pecten 
  ? 
  elongatus 
  ? 
  Stuchburyanus. 
  

  

  ? 
  striatocostatus. 
  

  

  Spondylus 
  striatus 
  (Sow.). 
  

   Lima 
  ? 
  rap 
  a. 
  

   Area 
  rotundata 
  (Sow.). 
  

   Pectunculus 
  umbonatus 
  (Sow.). 
  

  

  ? 
  sp. 
  (very 
  finely 
  striated). 
  

  

  Trigonia 
  Arcbiaciana 
  (Jjycett), 
  Mon. 
  Foss. 
  Trig. 
  Pal. 
  Soc. 
  pi. 
  xxiii. 
  

  

  fig. 
  7, 
  =T. 
  Vicaryana 
  (Lycett). 
  

   Opis 
  Gralliennei 
  (d 
  Orb.). 
  

  

  ?sp. 
  

  

  Radiolites 
  ? 
  

  

  A 
  few 
  unnamed 
  Gasteropoda 
  and 
  one 
  amphicoelian 
  vertebra 
  have 
  

   also 
  been 
  found 
  at 
  Haldon, 
  but 
  possibly 
  not 
  from 
  the 
  bed 
  of 
  which 
  

   we 
  are 
  now 
  speaking. 
  

  

  Here 
  then, 
  if 
  we 
  omit 
  the 
  Orbitolina 
  chert, 
  the 
  upward 
  limit 
  

   is 
  reached, 
  and 
  nothing 
  remains 
  but 
  the 
  gravels. 
  Barrois 
  says, 
  

   in 
  special 
  reference 
  to 
  the 
  Isle 
  of 
  Wight 
  Greensand, 
  but 
  perhaps 
  in 
  

   reference 
  in 
  some 
  degree 
  to 
  equivalents 
  elsewhere, 
  " 
  Le 
  melange 
  

   d'especes 
  est 
  du 
  a 
  une 
  confusion 
  de 
  couches." 
  The 
  stricture 
  is, 
  

   however, 
  only 
  in 
  part 
  applicable 
  to 
  Blackdown 
  ; 
  for, 
  though 
  certain 
  

   fairly 
  marked 
  zones 
  may 
  be 
  traced, 
  it 
  would 
  not 
  appear, 
  on 
  com- 
  

   parison 
  with 
  lists 
  of 
  Cretaceous 
  fossils 
  from 
  other 
  localities 
  *, 
  that 
  

   we 
  have 
  exclusively 
  Upper 
  Greensand 
  fossils 
  at 
  the 
  top, 
  or 
  exclu- 
  

   sively 
  Lower 
  Greensand 
  forms 
  at 
  the 
  base, 
  or, 
  again, 
  exclusively 
  Gault 
  

   forms 
  in 
  the 
  middle. 
  

  

  It 
  should 
  also 
  be 
  remembered 
  that 
  beneath 
  all 
  the 
  fossiliferous 
  

   beds 
  there 
  lies 
  bed 
  1, 
  or 
  30 
  feet 
  of 
  whitish 
  sand-rock, 
  and 
  that 
  in 
  

   regard 
  to 
  the 
  age 
  of 
  this 
  there 
  is 
  scarcely 
  any 
  thing 
  organic 
  to 
  

   instruct 
  us. 
  

  

  Discussion. 
  

  

  Mr. 
  Chaiipeenowne 
  corroborated 
  the 
  statement 
  of 
  the 
  low 
  position 
  

   of 
  Pecten 
  quadricostatus 
  at 
  Haldon, 
  and 
  its 
  high 
  position 
  in 
  the 
  

   Blackdown 
  series. 
  He 
  was 
  not 
  sure, 
  however, 
  whether 
  the 
  Whet- 
  

   stone 
  beds 
  might 
  not 
  have 
  a 
  slightly 
  greater 
  thickness 
  than 
  Mr. 
  

   Downes 
  had 
  given 
  them. 
  He 
  called 
  attention 
  also 
  to 
  the 
  interest 
  of 
  

   some 
  of 
  the 
  specimens 
  exhibited 
  by 
  the 
  author. 
  The 
  paper 
  was, 
  he 
  

   thought, 
  a 
  very 
  valuable 
  one. 
  

  

  Prof. 
  Seelet 
  thought 
  that 
  the 
  materials 
  brought 
  forward 
  by 
  the 
  

   author 
  supplied 
  the 
  means 
  of 
  determining 
  the 
  parallelism 
  of 
  the 
  

   Blackdown 
  beds. 
  In 
  the 
  Cretaceous 
  series 
  an 
  association 
  of 
  fossils 
  

   took 
  place 
  in 
  following 
  the 
  beds 
  westwards, 
  similar 
  to 
  that 
  which 
  

   would 
  be 
  observed 
  in 
  the 
  Tertiaries 
  ; 
  the 
  zones 
  which 
  were 
  clear 
  in 
  

   the 
  east, 
  became 
  confused 
  in 
  the 
  west. 
  He 
  had 
  formerly 
  examined 
  

  

  * 
  Catalogue 
  of 
  Cretaceous 
  Fossils 
  in 
  the 
  Museum 
  of 
  Practical 
  Geology. 
  

  

  