﻿9° 
  

  

  PKOCEEDLNGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  

  Genera. 
  

  

  Species 
  

  

  Belemnites 
  .... 
  

  

  .. 
  .. 
  1 
  

  

  2 
  

  

  Nautilus 
  

  

  .. 
  .. 
  1 
  

  

  1 
  

  

  Ammonites 
  .... 
  

  

  1 
  

  

  7 
  

  

  Gasteropoda 
  . 
  . 
  

  

  .... 
  7 
  

  

  7 
  

  

  Monomyaria 
  . 
  . 
  

  

  .... 
  7 
  

  

  12 
  

  

  Dimyaria 
  .... 
  

  

  ....11 
  

  

  17 
  

  

  Brachiopoda 
  . 
  . 
  

  

  .... 
  3 
  

  

  . 
  , 
  5 
  

  

  Crustacea 
  .... 
  

  

  .. 
  .. 
  1 
  

  

  2 
  

  

  Annelida 
  .... 
  

  

  .... 
  1 
  

  

  1 
  

  

  Echinoidea 
  .... 
  

  

  .. 
  .. 
  5 
  

  

  5 
  

  

  Asteriadge 
  .... 
  

  

  .... 
  1 
  

  

  1 
  

  

  Crinoidea 
  .... 
  

  

  .. 
  .. 
  1 
  

  

  1 
  

  

  Coelenterata 
  . 
  . 
  

  

  .. 
  .. 
  2 
  

  

  2 
  

  

  Protozoa 
  

  

  .... 
  1 
  

  

  2 
  

  

  Wood 
  &c 
  

  

  .. 
  .. 
  1 
  

  

  1 
  

  

  44 
  66 
  

  

  Cayton 
  Bay, 
  Filey, 
  and 
  Pickering 
  are 
  the 
  chief 
  localities. 
  Huge 
  

   Ammonites 
  characterize 
  this 
  horizon. 
  The 
  groups 
  Cordati, 
  Armati, 
  

   and 
  Annulati 
  are 
  conspicuous. 
  The 
  Oordati 
  are 
  represented 
  by 
  Am. 
  

   excavatus, 
  A. 
  Sutherlandice, 
  and 
  A. 
  vertebrcdis 
  ; 
  the 
  Armati 
  by 
  the 
  

   type 
  Ammonite 
  of 
  the 
  formation, 
  A. 
  perarmatus 
  ; 
  the 
  Annulati 
  

   by 
  Am. 
  plicatilis, 
  which 
  ascends 
  to 
  the 
  Passage-beds. 
  This 
  sin- 
  

   gular 
  Ammonite 
  appears 
  to 
  be 
  the 
  Am. 
  triplicates 
  of 
  Sowerby, 
  or 
  Am. 
  

   inr/ens 
  of 
  Young 
  and 
  Bird. 
  I 
  must 
  refer 
  for 
  much 
  valuable 
  matter 
  

   upon 
  the 
  distribution 
  of 
  the 
  fossils 
  to 
  Mr. 
  Hudleston's 
  paper. 
  He 
  

   subsequently 
  describes 
  two 
  special 
  sections, 
  the 
  first 
  being 
  the 
  

   Scarborough 
  Castle 
  Yard 
  and 
  Hill 
  series, 
  and 
  the 
  second 
  the 
  Filey 
  

   Brigg 
  section 
  ; 
  they 
  are 
  models 
  of 
  field-work 
  reduced 
  to 
  description. 
  

   It 
  has 
  been 
  my 
  good 
  fortune 
  to 
  examine 
  every 
  foot 
  of 
  these 
  

   and 
  other 
  sections 
  described 
  by 
  Mr. 
  Hudleston. 
  The 
  paragraph 
  

   upon 
  the 
  correlation 
  of 
  the 
  Calcareous 
  Grit 
  amongst 
  its 
  members 
  

   through 
  the 
  county 
  is 
  a 
  great 
  contribution 
  to 
  Corallian 
  geology. 
  

  

  Mr. 
  Hudleston's 
  third 
  communication 
  is 
  devoted 
  to 
  the 
  Coralline 
  

   Limestones, 
  divided 
  into 
  five 
  groups, 
  commencing 
  with 
  — 
  

  

  1. 
  The 
  Lower 
  Limestones, 
  in 
  6 
  divisions. 
  

  

  2 
  f 
  The 
  Middle 
  Calcareous 
  Grit, 
  in 
  1 
  division. 
  

   ' 
  | 
  The 
  Coralline 
  Oolite, 
  in 
  3 
  divisions. 
  

  

  3. 
  The 
  Coral 
  Bag, 
  subzone 
  of 
  Cidaris 
  florigemma, 
  in 
  3 
  divisions. 
  

  

  4. 
  The 
  Supracoralline 
  beds, 
  in 
  3 
  divisions. 
  

  

  A 
  Table 
  giving 
  the 
  generalized 
  scheme 
  of 
  the 
  Coralline 
  Limestones 
  

   and 
  associated 
  beds 
  is 
  appended 
  to 
  the 
  memoir, 
  with 
  every 
  particular 
  ; 
  

   separate 
  lists 
  are 
  attached 
  to 
  each 
  group 
  and 
  its 
  subdivisions. 
  The 
  

   Coralline 
  fauna 
  occurring 
  in 
  the 
  Lower 
  Calc 
  Grit, 
  the 
  Coralline 
  

   Oolite, 
  the 
  Coral 
  Bag, 
  and 
  the 
  Supracoralline 
  beds 
  is 
  large 
  and 
  

   general, 
  numbering 
  120 
  genera 
  and 
  295 
  species. 
  The 
  accompanying 
  

   Table 
  (YIII.) 
  expresses 
  the 
  number 
  of 
  genera 
  and 
  species 
  in 
  the 
  

   classes 
  or 
  groups. 
  For 
  the 
  range 
  of 
  every 
  species 
  reference 
  should 
  be 
  

   made 
  to 
  the 
  Table 
  in 
  Mr. 
  Hudleston's 
  paper, 
  loc. 
  cit. 
  pp. 
  481-494. 
  

  

  