﻿REV. 
  W. 
  BOAVNES 
  ON" 
  THE 
  ELACKDOWN 
  BEDS. 
  85 
  

  

  come 
  out 
  at 
  or 
  near 
  the 
  base 
  of 
  the 
  greensand, 
  at 
  Haldon 
  seem 
  im- 
  

   variably 
  to 
  come 
  out 
  at 
  the 
  base 
  of 
  the 
  flint 
  gravel. 
  

  

  To 
  sum 
  this 
  up, 
  we 
  have, 
  if 
  we 
  go 
  to 
  the 
  base 
  of 
  the 
  section 
  (bed 
  1), 
  

   probably 
  still- 
  and 
  fairly 
  deep-water 
  conditions 
  exhibited, 
  but 
  at 
  first 
  

   no 
  signs 
  of 
  life. 
  The 
  concretionary 
  layers 
  which 
  after 
  a 
  while 
  begin 
  

   to 
  appear 
  are 
  of 
  course 
  superinduced; 
  but 
  just 
  where 
  they 
  now 
  

   happen 
  to 
  come 
  in 
  scanty 
  traces 
  of 
  molluscan 
  life 
  begin 
  to 
  appear, 
  

   while 
  sponge-spicules 
  begin 
  to 
  be 
  abundant. 
  The 
  conditions, 
  

   then, 
  seem 
  to 
  point 
  either 
  to 
  elevation 
  or 
  to 
  silting 
  up, 
  at 
  any 
  rate 
  

   to 
  shallower 
  water 
  and 
  more 
  abundant 
  molluscan 
  life. 
  We 
  come 
  

   first 
  upon 
  occasional 
  waifs 
  and 
  strays, 
  and 
  then 
  upon 
  whole 
  colonies 
  

   of 
  species 
  fossilized 
  without 
  disturbance 
  in 
  their 
  original 
  habitat. 
  

   Still 
  shallower 
  conditions 
  seem 
  to 
  follow, 
  marked 
  by 
  current-action, 
  

   by 
  the 
  mingling 
  of 
  species, 
  by 
  separation 
  of 
  valves, 
  by 
  attrition 
  and 
  

   fracture. 
  Corals 
  and 
  Polyzoa 
  then 
  incrust 
  the 
  littoral 
  debris. 
  Then 
  

   there 
  is 
  a 
  missing 
  paragraph 
  or 
  twof 
  in 
  the 
  natural 
  chapter, 
  which 
  

   other 
  localities 
  may 
  perhaps 
  supply. 
  But 
  the 
  flint 
  gravel 
  remains, 
  

   telling 
  its 
  double 
  or, 
  rather, 
  triple 
  tale 
  of 
  subsidence 
  till 
  deep-sea 
  

   conditions 
  again 
  prevailed, 
  and 
  of 
  subsequent 
  upheaval 
  and 
  subaerial 
  

   denudation. 
  

  

  The 
  following 
  lists 
  of 
  fossils 
  are 
  corrected 
  from 
  those 
  published 
  

   by 
  me 
  in 
  1880. 
  Several 
  from 
  that 
  list, 
  including 
  Pecten 
  asper, 
  

   Lam., 
  are 
  now 
  rejected 
  on 
  the 
  ground 
  that 
  they 
  have 
  been 
  found 
  

   to 
  be 
  calcareous, 
  or 
  otherwise, 
  in 
  mineralogical 
  character, 
  mani- 
  

   festly 
  differing 
  from 
  Blackdown 
  specimens. 
  When 
  able 
  with 
  cer- 
  

   tainty 
  to 
  do 
  so, 
  I 
  have 
  recorded 
  the 
  beds, 
  or 
  range 
  of 
  beds, 
  from 
  

   which 
  they 
  severally 
  come. 
  The 
  initials 
  refer 
  to 
  the 
  museums 
  and 
  

   cabinets 
  in 
  which 
  the 
  specimens 
  may 
  be 
  seen. 
  Thus 
  : 
  — 
  J 
  = 
  Jermyn 
  

   Street, 
  K 
  = 
  British 
  Museum 
  at 
  Kensington, 
  B 
  = 
  Bristol 
  Museum, 
  

   E 
  = 
  Exeter 
  Museum, 
  T 
  = 
  Taunton 
  Museum, 
  V 
  = 
  Mr. 
  Yicary's 
  Col- 
  

   lection, 
  CE 
  = 
  that 
  of 
  Mr. 
  Caleb 
  Evans, 
  W 
  = 
  that 
  of 
  Mr. 
  Walrond, 
  

   of 
  Dulford 
  House, 
  near 
  Collumpton, 
  C 
  = 
  Mr. 
  Champernowne, 
  

   M 
  = 
  that 
  of 
  Mr. 
  Meyer, 
  D 
  = 
  my 
  own. 
  

  

  Blackdoivn 
  Fossils. 
  

   (Those 
  which 
  have 
  been 
  found 
  at 
  Haldon 
  also 
  are 
  marked 
  with 
  an 
  asterisk.) 
  

  

  Plants. 
  

   A 
  fern-like 
  impression. 
  V. 
  

  

  Wood, 
  silicified 
  and 
  (frequently) 
  bored 
  by 
  Teredo 
  ? 
  Common. 
  

   xSequoites 
  Woodwardii 
  (Carruthers). 
  Journal 
  of 
  Botany, 
  1867, 
  p. 
  27, 
  

   pi. 
  lix. 
  figs. 
  11-16. 
  

  

  Sponghxe. 
  

  

  Siphonia 
  pyriformis 
  (Gold/.). 
  Bed 
  8. 
  Common. 
  

  

  Spicula 
  distributed 
  throughout 
  the 
  beds. 
  These 
  have 
  been 
  treated 
  in 
  detail 
  by 
  

  

  Mr. 
  E. 
  Parfitt 
  and 
  by 
  Dr. 
  Carter 
  in 
  the 
  works 
  above 
  quoted. 
  Bed 
  5 
  

  

  seems 
  most 
  rich 
  in 
  these 
  spicula. 
  

  

  Actinozoa. 
  

  

  *Smilotrocims 
  Austeni 
  (E. 
  # 
  K). 
  [? 
  Trochosmilia]. 
  T, 
  0. 
  

   Coral. 
  E. 
  

   Probably 
  all 
  are 
  traces 
  of 
  Bed 
  13, 
  which 
  is 
  more 
  fully 
  developed 
  at 
  Haldon. 
  

  

  t 
  Perhaps 
  it 
  was 
  a 
  land 
  area 
  during 
  the 
  age 
  of 
  the 
  Chloritic 
  Marl 
  &c. 
  

  

  