﻿300 
  

  

  PROCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  several 
  of 
  them 
  being 
  referred 
  to 
  A. 
  leptopluillus, 
  whilst 
  a 
  few 
  were 
  

   determined 
  as 
  A. 
  Leivesiensis 
  and 
  one 
  example 
  as 
  A. 
  peramplus, 
  all 
  of 
  

   which, 
  it 
  was 
  suggested, 
  might 
  re|)resent 
  one 
  species. 
  The 
  lithological 
  

   features 
  of 
  the 
  subject, 
  in 
  connection 
  with 
  the 
  occurrence 
  of 
  a 
  line 
  of 
  

   scattered 
  flints, 
  were 
  of 
  great 
  importance, 
  so 
  much 
  so 
  that 
  in 
  more 
  

   recent 
  years 
  Dr. 
  Arthur 
  Rowe 
  ' 
  named 
  it 
  the 
  ' 
  Bedwell-line 
  ', 
  

   regarding 
  it 
  as 
  representing 
  a 
  zoological 
  break 
  in 
  the 
  zone 
  of 
  

   Marsupites 
  tesUidinarius, 
  above 
  which, 
  speaking 
  generally, 
  the 
  

   Ceplialopod 
  Actinocamax 
  Merceyi 
  is 
  always 
  found, 
  whilst 
  Ammonites 
  

   leptophylhis 
  was 
  restricted 
  to 
  a 
  position 
  below 
  the 
  line. 
  

  

  Mr. 
  C. 
  J. 
  A. 
  Meyer- 
  contributed 
  an 
  important 
  memoir 
  in 
  1874 
  on 
  

   the 
  Cretaceous 
  rocks 
  of 
  Beer 
  Head 
  in 
  Devonshire. 
  The 
  Chalk 
  cliffs 
  

   o£ 
  this 
  area 
  form 
  the 
  most 
  westerly 
  Chalk 
  promontory 
  of 
  England. 
  

   A. 
  general 
  vertical 
  section 
  was 
  given 
  of 
  the 
  district, 
  subdivided 
  into 
  

   twenty 
  beds 
  representing 
  formations 
  ranging 
  from 
  the 
  Gault 
  to 
  the 
  

   Upper 
  Chalk, 
  the 
  Blackdown 
  Beds 
  being 
  bracketed 
  with 
  the 
  GauU, 
  

   and 
  the 
  Warminster 
  deposits 
  regarded 
  as 
  equivalent 
  to 
  the 
  Cbloritic 
  

   Marl. 
  The 
  whole 
  of 
  the 
  beds 
  were 
  classified 
  into 
  what 
  the 
  author 
  

   termed 
  ' 
  zones 
  of 
  fossils 
  ', 
  the 
  indices 
  of 
  which 
  were 
  mainly 
  moUuscan, 
  

   belonging 
  to 
  the 
  Cephalopoda 
  and 
  Pelecypoda, 
  the 
  remaining 
  index 
  - 
  

   fossils 
  being 
  species 
  of 
  Echinoids, 
  Brachiopoda, 
  and 
  Foraminifera. 
  

   These 
  zones 
  were 
  thus 
  enumerated 
  : 
  — 
  

  

  Formations. 
  

   TJppEE, 
  (?) 
  Chalk 
  . 
  

   Middle 
  Chalk 
  . 
  

  

  Lower 
  Chalk 
  

  

  Chalk 
  Maul 
  

  

  Chlouitic 
  Maul 
  . 
  

   (AVarminster 
  Beds.) 
  

  

  Zones 
  of 
  Fossils. 
  

   Micraster 
  coranguimim. 
  

   Terebratula 
  carnea. 
  

   Lioceramiis 
  Ciwieri. 
  

   Terebratula 
  sem 
  iglobosa. 
  

   Inoccramus 
  Brongniarti. 
  

   Ilolaster 
  planus. 
  

   Inoceramus 
  mi/tiluicles. 
  

   Micraster 
  corhovis. 
  

   Rliynchonella 
  Cuvieri. 
  

   Discoidea 
  suluculus. 
  

   Ammonites 
  Mantelii. 
  

   Discoidea 
  cylindrica. 
  

   Rhynchonella 
  Mantelliana. 
  

   Ammonites 
  Rhotomagensis 
  

   ScajjJiites 
  (equalis. 
  

   Solaster 
  suhglobosus. 
  

   Cntopygus 
  carinatus. 
  

   Rliynchonella 
  dim 
  idiata. 
  

   Terebratula 
  pectita. 
  

   Exogyra 
  columba 
  (var.). 
  

   Siphonia. 
  

  

  Nautilus 
  Icerigatus. 
  

   Discoidea 
  subuculus. 
  

  

  1 
  Proc. 
  Geol. 
  Assoc, 
  vol. 
  xvi, 
  p. 
  295, 
  1900. 
  

  

  - 
  Quart. 
  Journ. 
  Geol. 
  Soc, 
  vol. 
  xxx, 
  pp. 
  369-93, 
  1874. 
  

  

  