﻿592 
  

  

  MB. 
  G. 
  W. 
  LAWPLTTGH 
  OX 
  THE 
  

  

  List 
  of 
  Fossils 
  (continued). 
  

  

  „ 
  

  

  

  

  1 
  — 
  " 
  

  

  

  00 
  

  

  rj 
  

  

  

  ^3 
  

  

  3 
  

  

  

  

  

  

  - 
  > 
  

  

  -*J 
  

  

  r- 
  

  

  . 
  ^ 
  

  

  

  

  

  o 
  

  

  W 
  

  

  ■S-S 
  

  

  — 
  

  

  o 
  

  

  ^-.-i 
  

  

  a 
  

  

  

  s^ 
  

  

  U 
  

  

  pq 
  

  

  S 
  

  

  £ 
  

  

  D6-. 
  

  

  5#4- 
  

  

  ■Eta 
  

  

  5#- 
  

  

  Pecten 
  cinctus. 
  .Sow; 
  

  

  Serpula 
  (articulata, 
  Sow., 
  of 
  Judd.— 
  

   S. 
  vertebralis 
  of 
  Leckenby's 
  list)... 
  

  

  antiquata 
  ?, 
  Sow 
  

  

  Pentacrinus 
  annulatus 
  ?, 
  Bomer 
  

  

  Meyeria 
  ornata, 
  Phil 
  

  

  Cidaris 
  (spine) 
  

  

  Fish 
  (vertebrae 
  and 
  teeth) 
  

  

  Saurians 
  

  

  Coral 
  (grooving 
  on 
  Serpula) 
  

  

  Lichenopora 
  

  

  Xote. 
  — 
  In 
  these 
  lists 
  where 
  the 
  specific 
  name 
  is 
  placed 
  in 
  brackets, 
  it 
  indi- 
  

   cates 
  that, 
  though 
  the 
  fossil 
  is 
  in 
  my 
  collection, 
  the 
  determination 
  is 
  that 
  of 
  a 
  

   previous 
  author 
  which 
  has 
  not 
  yet 
  been 
  confirmed. 
  

  

  C. 
  Zone 
  of 
  Belemnites 
  jaculum. 
  

  

  I 
  have 
  already 
  described 
  the 
  incoming 
  of 
  this 
  Belemnite 
  with 
  

   its 
  accompanying 
  Ammonite 
  (Amm. 
  norieus. 
  Schloth.). 
  ^vVith 
  these 
  

   fossils 
  we 
  reach 
  a 
  stage 
  of 
  which 
  the 
  Lower 
  Cretaceous 
  or 
  Xeocomian 
  

   age 
  is 
  beyond 
  dispute, 
  though 
  there 
  are 
  still 
  two 
  or 
  three 
  bivalves 
  

   in 
  the 
  lowest 
  beds 
  of 
  the 
  zone 
  which 
  seem 
  to 
  be 
  Jurassic 
  species, 
  

   as 
  might 
  be 
  expected 
  from 
  the 
  conformable 
  nature 
  of 
  the 
  passage. 
  

   From 
  this 
  point 
  upwards 
  there 
  has 
  been 
  a 
  steady 
  and 
  apparently 
  

   uninterrupted 
  accumulation 
  of 
  clay, 
  and 
  an 
  equally 
  steady 
  advance 
  

   of 
  the 
  fauna. 
  

  

  Belemnites 
  jacidum 
  ranges 
  through 
  about 
  120 
  feet 
  of 
  clay, 
  and 
  

   throughout 
  this 
  thickness 
  I 
  have 
  seen 
  but 
  a 
  single 
  specimen 
  of 
  a 
  

   different 
  species. 
  The 
  solitary 
  trespasser, 
  which 
  was 
  found 
  in 
  the 
  

   upper 
  part 
  of 
  the 
  Noricus-heda, 
  is 
  a 
  deeply 
  grooved 
  Belemnite, 
  not 
  

   rare 
  in 
  the 
  upper 
  division 
  (B) 
  of 
  the 
  series. 
  

  

  Amm. 
  noricus 
  has 
  not 
  nearly 
  so 
  extended 
  a 
  range 
  as 
  B. 
  jacidum, 
  

   dying 
  out 
  after 
  tenanting 
  less 
  than 
  30 
  feet 
  of 
  the 
  zone, 
  and 
  giving 
  

   place 
  to 
  Amm. 
  speetonensis, 
  T. 
  & 
  B., 
  which, 
  in 
  its 
  turn, 
  shows 
  up 
  

   strongly 
  through 
  the 
  succeeding 
  30 
  feet 
  and 
  then 
  becomes 
  very 
  rare, 
  

   though 
  it 
  does 
  not 
  actually 
  disappear 
  till 
  we 
  come 
  very 
  nearly 
  to 
  

   the 
  top 
  of 
  the 
  zone. 
  These 
  Ammonites 
  thus 
  mark 
  convenient 
  sub- 
  

   divisions, 
  and 
  have 
  been 
  used 
  by 
  Judd 
  for 
  that 
  purpose. 
  

  

  The 
  section, 
  fig. 
  5, 
  gives 
  the 
  full 
  extent 
  of 
  the 
  zone 
  and 
  shows 
  

   these 
  subdivisions. 
  It 
  is 
  the 
  result 
  of 
  repeated 
  measurements 
  on 
  

   the 
  shore 
  off 
  Black 
  Cliff, 
  to 
  a 
  great 
  extent 
  checked 
  and 
  corroborated 
  

  

  