﻿JURASSIC 
  CLAYS 
  OF 
  LINCOLNSHIRE. 
  551 
  

  

  In 
  a 
  brickyard 
  north 
  of 
  South 
  Kelsey 
  may 
  be 
  seen 
  15 
  feet 
  of 
  

   black 
  clays 
  containing 
  numerous 
  crystals 
  of 
  selenite 
  ; 
  near 
  the 
  floor 
  

   of 
  the 
  pit 
  is 
  a 
  layer 
  of 
  septarian 
  nodules 
  from 
  which 
  the 
  majority 
  

   of 
  the 
  following 
  fossils 
  were 
  obtained 
  : 
  — 
  

  

  Ammonites 
  plicatilis, 
  Sow. 
  

  

  decipiens, 
  Sow. 
  

  

  Alaria 
  bispinosa, 
  Phill. 
  

  

  Avicula 
  pteropernoides, 
  Bl. 
  cf 
  H. 
  

  

  Pecten 
  fibrosus, 
  Sow. 
  

  

  Gryphsea 
  dilatata, 
  Sow. 
  

   Ostrea 
  bullata, 
  Sow. 
  

   Pholadouiya 
  concentrica, 
  Rom. 
  

   Rhynchonella, 
  nov. 
  sp. 
  (near 
  to 
  

   subvariabilis). 
  

  

  Similar 
  clays 
  are 
  exposed 
  in 
  a 
  brickyard 
  about 
  half 
  a 
  mile 
  west 
  

   of 
  North 
  Kelsey 
  station, 
  which 
  yielded 
  the 
  following 
  fossils 
  : 
  — 
  

  

  Ichthyosaurus 
  (vertebrae). 
  

   Ammonites 
  achilles, 
  d'Orb. 
  

  

  plicatilis, 
  Sow. 
  

  

  Belemuites 
  abbreviatus, 
  Mill. 
  

   Alaria 
  bispinosa, 
  Phill. 
  

   Oardium 
  striatulum, 
  Sow. 
  

  

  Thracia 
  depressa, 
  Sow. 
  

   Astarte 
  supracorallina, 
  d 
  Orb. 
  

   Oucullaea 
  contracta, 
  Phill. 
  

   Avicula, 
  sp. 
  

   Pinna 
  lanceolata, 
  Sow. 
  

  

  In 
  the 
  first 
  railway-cutting 
  east 
  of 
  Brigg 
  are 
  black 
  clays 
  with 
  

   some 
  septarian 
  nodules 
  and 
  a 
  few 
  selenite 
  crystals. 
  Grypluea 
  

   dilatata 
  is 
  very 
  common 
  in 
  these 
  clays, 
  from 
  which 
  also 
  the 
  following 
  

   fossils 
  were 
  obtained 
  : 
  — 
  

  

  Ammonites 
  cordatus, 
  Sow. 
  

   Alaria 
  bispinosa, 
  Phill. 
  

  

  Rhynchonella, 
  nov. 
  sp. 
  (near 
  to 
  

  

  subvariabilis). 
  

   Serpula 
  tricarinata, 
  Sow. 
  

  

  Prof. 
  Blake 
  also 
  records 
  nine 
  species 
  from 
  this 
  cutting 
  *, 
  

   Further 
  north, 
  in 
  the 
  western 
  half 
  of 
  the 
  Wrawby- 
  Bridge 
  cutting, 
  

  

  are 
  black 
  clays 
  very 
  rich 
  in 
  selenite. 
  The 
  clays 
  are 
  much 
  weathered, 
  

  

  but 
  the 
  following 
  fossils 
  were 
  obtained 
  here 
  : 
  — 
  

  

  Ostrea 
  deltoidea 
  Sow. 
  

  

  Rhynchonella, 
  nov. 
  sp. 
  (near 
  to 
  subvariabilis). 
  

  

  Serpula, 
  sp. 
  

  

  Another 
  cutting, 
  about 
  A 
  mile 
  north-west 
  of 
  the 
  last 
  mentioned, 
  

   shows 
  precisely 
  similar 
  clays, 
  with 
  some 
  septarian 
  nodules, 
  which 
  

   yielded 
  the 
  following 
  fossils 
  : 
  — 
  

  

  Ammonites 
  achilles, 
  oV 
  Orb. 
  

   Ostrea 
  deltoidea, 
  Sow. 
  

  

  Prof. 
  Blake 
  also 
  mentions 
  the 
  occurrence 
  here 
  of 
  GrypJicea 
  dilatata, 
  

   Belemnites 
  nitidus, 
  and 
  six 
  other 
  species 
  f 
  . 
  

  

  He 
  also 
  quotes 
  ten 
  species 
  from 
  Wrawby 
  J, 
  which, 
  from 
  its 
  

   position, 
  should 
  be 
  on 
  the 
  horizon 
  of 
  these 
  selenitiferous 
  clays. 
  At 
  

   the 
  present 
  time, 
  however, 
  no 
  section 
  is 
  visible 
  near 
  this 
  village 
  

   except 
  those 
  in 
  the 
  above-mentioned 
  railway-cuttings. 
  

  

  Leaving 
  aside 
  the 
  consideration 
  of 
  the 
  age 
  of 
  these 
  clays 
  for 
  the 
  

   present, 
  we 
  pass 
  on 
  to 
  a 
  description 
  of 
  the 
  clays 
  which 
  succeed 
  them. 
  

   This 
  second 
  zone 
  is 
  characterized 
  by 
  the 
  presence 
  of 
  Ostrea 
  deltoidea 
  

   in 
  abundance. 
  

  

  * 
  Op. 
  e&. 
  p. 
  206. 
  t 
  Op. 
  cit. 
  p. 
  209. 
  \ 
  Op. 
  cit. 
  p. 
  207. 
  

  

  