﻿ANNIVERSARY 
  ADDKESS 
  OF 
  THE 
  PEESIDENT. 
  

  

  121 
  

  

  Bed 
  No. 
  1. 
  The 
  Eoach, 
  shelly! 
  

   limestone 
  with 
  | 
  

  

  Cerithium 
  portlandicum 
  (confined) 
  ; 
  

   Sowerbya 
  Dukei, 
  Buccinum 
  nati- 
  

   coides, 
  Trigonia 
  gibbosa, 
  Lucina 
  

   portlandica 
  (rare), 
  Pecten 
  lamel- 
  

   losus; 
  Ostrea 
  expansa, 
  and 
  Ratica 
  

   y 
  elegans 
  (abundant). 
  

  

  2. 
  The 
  Whit 
  bed 
  Ammonites 
  giganteus, 
  confined. 
  

  

  3. 
  The 
  Curf 
  Ostrea 
  solitaria, 
  Isastrcea 
  oblong 
  a. 
  

  

  4. 
  The 
  Base 
  bed 
  Isastraa 
  oblong 
  a, 
  with 
  its 
  perforating 
  

  

  Lithodomi. 
  

  

  5. 
  Upper 
  part, 
  Trigonia- 
  

  

  bed 
  Trigonia 
  gibbosa. 
  

  

  6. 
  Upper 
  part 
  solid 
  flint, 
  

  

  lower 
  part 
  rubble. 
  

  

  7. 
  Serpula-bed 
  Serpula 
  gordialis, 
  Ostrea 
  multiformis. 
  

  

  8. 
  Main 
  mass 
  of 
  flinty 
  f 
  Ammonites 
  boloniensis, 
  Trigonia 
  gib- 
  

  

  series 
  \ 
  bosa, 
  T. 
  incurva, 
  Perna. 
  

  

  Ammonites 
  pseudogigas, 
  Am. 
  triplex, 
  

   Pleurotomaria 
  rugata, 
  P. 
  Bozeti, 
  

   Cardium 
  dissimile, 
  Cyprina 
  elon- 
  

   gata, 
  Lima 
  rustica, 
  Pecten 
  lamel- 
  

   losus, 
  Trigonia 
  gibbosa, 
  T. 
  incurva, 
  

   Pleuromya 
  tellina. 
  

  

  10. 
  Blue 
  marl 
  No 
  fossils. 
  

  

  11. 
  Marlandsand,nodular 
  J 
  Myjihis*utissiodorensis 
  Pecten 
  soli- 
  

  

  , 
  , 
  , 
  ' 
  N 
  \ 
  dus, 
  Cyprina 
  impucata, 
  C. 
  elonqata, 
  

  

  (cement-stone) 
  j 
  Ammonites 
  bipl/x. 
  * 
  

  

  Exogyra-bed 
  ( 
  Exo 
  9y 
  ra 
  bruntrutana 
  (the 
  only 
  fossil 
  

  

  9. 
  The 
  shell-bed 
  

  

  Yellow 
  sandy 
  bed 
  .. 
  

  

  Sandy 
  marl, 
  gradu- 
  | 
  

   ally 
  changing 
  into- 
  

   Kimmeridge 
  Clay 
  

  

  { 
  occurring). 
  

   Cyprina 
  implicata, 
  Area. 
  

  

  (Ammonites 
  biplex, 
  Naticaincisa, 
  Lima 
  

   boloniensis, 
  Pecten 
  Morini, 
  Avicula 
  

   octavia, 
  Trigonia 
  incurva, 
  T. 
  muri- 
  

   cata, 
  T. 
  Pellati, 
  Bhynchonella 
  port- 
  

   landica, 
  Discina 
  Humphriesiana, 
  

   Pleuromya 
  tellina. 
  

  

  Kimmeridge 
  Clay 
  below. 
  

  

  Full 
  details 
  of 
  the 
  physical 
  character 
  of 
  these 
  14 
  divisions 
  at 
  the 
  

   Isle 
  of 
  Portland 
  are 
  given 
  by 
  Mr. 
  Blake 
  ; 
  and 
  regarding 
  this 
  on 
  the 
  

   whole 
  as 
  the 
  type 
  section, 
  the 
  other 
  five 
  areas 
  named 
  may 
  be 
  com- 
  

   pared 
  with 
  it. 
  

  

  St. 
  Alb 
  ^n's 
  Head 
  and 
  Kimmeridge. 
  

  

  The 
  first 
  10 
  beds 
  in 
  the 
  St. 
  Alban's 
  Head 
  section 
  can 
  be 
  more 
  or 
  

   less 
  correlated 
  with 
  those 
  of 
  the 
  Isle 
  of 
  Portland 
  ; 
  the 
  beds 
  numbered 
  

   15 
  and 
  16 
  are 
  in 
  excess 
  of 
  the 
  Portland-sand 
  series 
  at 
  Portland, 
  

   and 
  add 
  about 
  130 
  feet 
  to 
  the 
  section. 
  The 
  fossils 
  are 
  much 
  the 
  

   same 
  as 
  in 
  the 
  several 
  Portland-Isle 
  beds, 
  and 
  need 
  no 
  comment 
  here. 
  

  

  Mr. 
  Blake 
  discusses 
  the 
  question 
  of 
  difference 
  between 
  the 
  Bou- 
  

   logne 
  and 
  Kimmeridge 
  sections, 
  and 
  the 
  introduction 
  of 
  the 
  terms 
  

   Middle 
  and 
  Lower 
  Portlandian 
  by 
  the 
  French 
  geologists. 
  Com- 
  

   parative 
  sections 
  at 
  Boulogne 
  and 
  Kimmeridge 
  are 
  given 
  on 
  page 
  

   197 
  : 
  and 
  the 
  difference 
  between 
  the 
  two 
  sections 
  is 
  shown. 
  The 
  

   English 
  Kimmeridge 
  beds 
  (shales 
  and 
  clays) 
  show 
  that 
  there 
  are 
  

   1100 
  feet 
  between 
  the 
  base 
  of 
  the 
  Portland 
  Stone 
  and 
  the 
  lowest 
  

   part 
  of 
  the 
  Kimmeridge 
  Clay 
  visible 
  (base 
  not 
  seen) 
  ; 
  but 
  the 
  total 
  

  

  