﻿122 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  thickness 
  of 
  the 
  Kimmeridge 
  at 
  Boulogne 
  between 
  the 
  Portlandian 
  

   and 
  Corallian 
  is 
  only 
  450 
  feet. 
  In 
  England, 
  as 
  Mr. 
  Blake 
  states, 
  

   " 
  we 
  possess 
  the 
  normal 
  formation 
  to 
  which 
  the 
  name 
  Kimmeridge 
  

   was 
  originally 
  applied 
  ; 
  while 
  at 
  Boulogne 
  we 
  find 
  an 
  ' 
  episode 
  ' 
  

   having 
  no 
  relation 
  to 
  the 
  Portlandian 
  above, 
  but 
  to 
  which 
  the 
  

   name 
  of 
  ' 
  Boulognian 
  ' 
  may 
  be 
  given." 
  " 
  The 
  upper 
  part 
  of 
  their 
  

   ' 
  Middle 
  Portlandian 
  ' 
  is 
  our 
  Portland 
  Sand," 
  and 
  contains 
  the 
  

   characteristic 
  shells 
  Mytilus 
  autissiodorensis, 
  Astarte 
  scalaria, 
  A. 
  Sce- 
  

   manni, 
  Pecten 
  Morini, 
  Avicula 
  octavia, 
  Lima 
  boloniensis, 
  Perna 
  

   Bouchardi, 
  and 
  Pecten 
  lamellosus. 
  " 
  The 
  lower 
  part 
  of 
  their 
  

   1 
  Middle 
  Portlandian 
  ' 
  consists 
  of 
  soft 
  sandy 
  marls 
  and 
  shales, 
  

   with 
  cement-stone 
  bands, 
  not 
  at 
  all 
  unlike 
  the 
  top 
  of 
  the 
  Kim- 
  

   meridge 
  at 
  Chapman's 
  Pool. 
  The 
  Cardium 
  Morinicum, 
  Belemnites 
  

   Souichii, 
  and 
  Discina 
  latissima 
  serve 
  to 
  prove 
  the 
  identity." 
  — 
  

   (Blake, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxxvi. 
  p. 
  196). 
  

  

  Yale 
  of 
  Wardotje. 
  

  

  The 
  Portland 
  series 
  here 
  commences 
  with 
  the 
  beds 
  containing 
  

   Cerithium 
  portlandicum 
  ; 
  and 
  the 
  fauna 
  of 
  the 
  10 
  succeeding 
  beds 
  

   I 
  will 
  notice 
  as 
  before. 
  

  

  ( 
  Bed 
  No. 
  1. 
  Fine-grained 
  brown 
  oolite 
  "I 
  

  

  Cerithium 
  portlandicum. 
  

  

  with 
  J 
  

  

  2. 
  Finely 
  oolitic 
  Cerithium 
  portlandicum. 
  

  

  (Pecten 
  lamellosus, 
  Cardium 
  dissimile, 
  

  

  3. 
  White 
  chalk 
  (like 
  Upway), 
  J 
  Lucina 
  portlandica, 
  Pleuromya 
  tel- 
  

  

  flints 
  1 
  Una, 
  Ostrea 
  expansa, 
  Trigonia 
  gib- 
  

  

  [ 
  bosa. 
  

  

  7 
  Astarte 
  rugosa, 
  Cerithium 
  concavnm, 
  

  

  4. 
  Fossiliferous 
  bed 
  \ 
  C. 
  Bouchardianum, 
  Nerita 
  trans- 
  

  

  \ 
  versa, 
  Neritnma 
  sinuosa. 
  

  

  5. 
  Trigonia-bed 
  Trigonia 
  gibbosa. 
  

  

  n 
  ™ 
  r 
  f 
  Ammonites 
  boloniensis, 
  A. 
  biplex, 
  

  

  6. 
  Fine 
  freestone 
  | 
  Isastrcea 
  oblonga. 
  

  

  7- 
  Doubtful 
  in 
  thickness 
  &c. 
  

  

  ,, 
  8. 
  Yellow 
  impure 
  sand 
  No 
  fossils. 
  

  

  ( 
  Trigonia 
  Pellati, 
  T. 
  variegata, 
  T. 
  con- 
  

  

  „ 
  9. 
  Impure 
  calcareous 
  bed, 
  | 
  centrica, 
  T. 
  Micheloti, 
  Mytilus 
  ju- 
  

  

  with 
  Lydian 
  stone 
  or\ 
  rensis, 
  Perna 
  Bouchardi, 
  Pecten 
  

  

  glauconite 
  | 
  concentricus, 
  Exogyra 
  bruntrutana, 
  

  

  ( 
  and 
  Serpula. 
  

  

  " 
  10 
  ' 
  H 
  bed 
  lmPUre 
  Calcare0US 
  } 
  Trigonia 
  Pellati, 
  Ostrea 
  bruntrutana. 
  

   „ 
  11. 
  Yellowish-grey 
  calcareous 
  1 
  Nq 
  fossila< 
  

   stone 
  J 
  

  

  Swindon. 
  

  

  These 
  richly 
  fossiliferous 
  and 
  abnormal 
  beds 
  are 
  the 
  most 
  ex- 
  

   tensive 
  out 
  of 
  the 
  Portland 
  and 
  Purbeck 
  areas 
  ; 
  and 
  the 
  uncon- 
  

   formability 
  of 
  the 
  Purbeck 
  strata 
  upon 
  the 
  Portlandian 
  beds 
  admits 
  

   of 
  no 
  doubt. 
  Mr. 
  Blake's 
  notice 
  of 
  these 
  great 
  quarries 
  is 
  the 
  only 
  

   detailed 
  one 
  yet 
  given 
  ; 
  and, 
  as 
  he 
  truly 
  remarks, 
  " 
  a 
  more 
  complicated 
  

   and, 
  at 
  the 
  same 
  time, 
  instructive 
  series 
  of 
  sections," 
  is 
  hardly 
  to 
  

  

  