﻿290 
  PKOCEEniNGS 
  OF 
  THE 
  3I.A.LACOL0GICAL 
  SOCIETY. 
  

  

  the 
  AViirtembei'g 
  Series 
  of 
  Germanj-. 
  In 
  this 
  account 
  the 
  authoi" 
  

   gave 
  a 
  complete 
  list 
  of 
  Lias 
  zones, 
  that 
  is, 
  including 
  those 
  forming 
  

   the 
  Lower, 
  Middle, 
  and 
  Upper 
  divisions 
  of 
  the 
  formation, 
  because 
  

   hitherto 
  he 
  had 
  only 
  zoned 
  the 
  lower 
  beds. 
  Another 
  innovation 
  on 
  

   this 
  occasion 
  was 
  the 
  introduction 
  and 
  adoption 
  of 
  the 
  modern 
  

   nomenclature 
  for 
  the 
  Ammonites 
  as 
  stratigraphical 
  index-fossils, 
  as 
  

   proposed 
  by 
  W. 
  Waagen 
  and 
  emended 
  by 
  such 
  authors 
  as 
  Mojsisovics, 
  

   jS^eumayr, 
  etc. 
  AVright's 
  zones 
  were 
  as 
  follows: 
  — 
  

  

  Upper 
  Lias 
  . 
  . 
  Lytoceras 
  Jurense, 
  Stephanoceras 
  commune. 
  

   Middle 
  Lias. 
  . 
  AmaUheus 
  spinatus, 
  A. 
  mar'garitatus, 
  CEgoceras 
  

  

  Henleyi, 
  AmaUheus 
  ibex, 
  CEgoceras 
  Jamesoni. 
  

   Lower 
  Lias 
  . 
  . 
  Arietitesraricostatus,AmaUhensoxijnotus,Arietites 
  

  

  obtusus, 
  A. 
  Turner 
  i., 
  A. 
  Buchlandi, 
  Q^goceras 
  

  

  (mgulatmn, 
  (E. 
  planorhis. 
  

   E.H^Tic 
  . 
  . 
  . 
  Avicula 
  contorta. 
  

  

  The 
  Inferior 
  Oolite 
  and 
  later 
  Jurassic 
  rocks, 
  which 
  succeed 
  the 
  

   Liassic 
  Series, 
  have 
  been 
  subjected 
  to 
  much 
  study 
  b}' 
  palaeontologists 
  

   for 
  manjr 
  years. 
  Dr. 
  Oppel,^ 
  however, 
  was 
  among 
  the 
  first 
  to 
  submit 
  

   them 
  to 
  a 
  systematic 
  classification 
  of 
  zonal 
  subdivisions, 
  and, 
  as 
  in 
  the 
  

   case 
  of 
  the 
  Lias, 
  it 
  was 
  mostly 
  on 
  the 
  basis 
  of 
  Ammonite 
  characters, 
  

   although 
  other 
  moUusca 
  Avere 
  adopted 
  for 
  this 
  purpose, 
  as 
  well 
  as 
  

   Brachiopods, 
  Echinoderms, 
  etc. 
  In 
  descending 
  order 
  these 
  zones 
  may 
  

   be 
  enumerated 
  as 
  — 
  

  

  PoETLAND 
  and 
  i' 
  Zone 
  of 
  Trigonia 
  gibhosa. 
  

   KiMERiDGE 
  Group, 
  ' 
  ,, 
  Pterocera 
  oceani. 
  

  

  or 
  \ 
  ,, 
  Astarte 
  supracoralUna. 
  

  

  KiMERiDGiEN 
  ' 
  ,, 
  Diccras 
  arietina. 
  

   The 
  localities 
  given 
  for 
  the 
  Portlandian 
  and 
  Kimeridgian 
  Group 
  

   included 
  the 
  Island 
  of 
  Portland, 
  Purbeck, 
  Kimeridge, 
  and 
  Osmingtou 
  

   (Dorset); 
  Tisbury, 
  Swindon, 
  and 
  AVooton 
  Basset 
  (Wilts); 
  Shotover 
  

   (Oxfordshire); 
  Aylesbury 
  (Bucks); 
  Hunstanton 
  (Norfolk); 
  Filey 
  

   Bay 
  (Yorkshire). 
  European 
  localities 
  were 
  referred 
  to 
  places 
  in 
  

   South-West 
  Germany, 
  the 
  Swiss 
  Jura, 
  and 
  France. 
  

  

  Oxford 
  Group 
  ( 
  Zone 
  of 
  Cidaris 
  florigemma. 
  

   or 
  OxFORDiEN 
  ( 
  ,, 
  Ammonites 
  biarmatus. 
  

  

  The 
  localities 
  for 
  the 
  Oxfordien 
  were 
  : 
  near 
  Weymouth 
  (Dorset) 
  ; 
  

   Wooton 
  Basset, 
  Chippenham, 
  and 
  Calne 
  (Wilts); 
  Malton 
  and 
  Scar- 
  

   borough 
  (Yorkshire). 
  European 
  : 
  South-West 
  Germany, 
  Swiss 
  Jura, 
  

   France. 
  

  

  Kelloway 
  Group 
  [ 
  Zone 
  of 
  Ammonites 
  athleta. 
  

   or 
  I 
  ,, 
  A. 
  anceps. 
  

  

  Callovien 
  f 
  ,, 
  A. 
  macroceplialus. 
  

  

  The 
  Callovien 
  localities 
  were: 
  Scarborough 
  (Yorkshire), 
  Christian 
  

   Malford 
  (Wilts), 
  Weymouth 
  (Dorset), 
  Lincolnshire, 
  Kelloways 
  

   (Wilts). 
  European 
  included 
  areas 
  of 
  South-West 
  Germany 
  and 
  

   France. 
  

  

  ^ 
  Die 
  Juraformation 
  England, 
  etc., 
  1856-8. 
  

  

  