﻿NEWTON 
  : 
  GEOLOGICAL 
  ZONES 
  A>D 
  THEIR 
  MOLLUSCA. 
  297 
  

  

  Sahlieri. 
  Gastropoda 
  : 
  Itostellaria 
  varicosa; 
  BeUeropliina 
  minuta. 
  

   I'elecypoda 
  : 
  Gervillia 
  solenoides. 
  (Zone 
  of 
  Crustacea 
  — 
  Pal(2o- 
  

   corystes.) 
  Gastropoda: 
  Turbo 
  decussatus 
  ; 
  Ampullaria 
  Icevigata. 
  

   Pelecypoda 
  : 
  Pinna 
  teiragona. 
  (Zone 
  of 
  Ammonites 
  auritiis, 
  var.) 
  

   Gastropoda 
  : 
  Fusiis 
  iferianus, 
  Scalaria 
  Bupiniana. 
  Pelecypoda 
  : 
  

   Mijtilus 
  GaUiennei. 
  (Zone 
  of 
  Ammonites 
  Benettianus 
  ?) 
  The 
  

   organic 
  remains 
  are 
  said 
  to 
  be 
  few 
  in 
  this 
  zone. 
  (Zone 
  of 
  

   Ammonites 
  inter 
  ruptus.) 
  Cephalopoda: 
  Ammonites 
  Desliayesi, 
  

   dentatus, 
  and 
  Gervillianus. 
  The 
  zone 
  of 
  Ammonites 
  mammillaris 
  

   at 
  the 
  base 
  was 
  regarded 
  as 
  belonging 
  to 
  the 
  Aptian 
  stage 
  of 
  the 
  

   Cretaceous 
  formation. 
  

  

  A 
  few 
  years 
  afterwards 
  the 
  late 
  Hilton 
  Price 
  ^ 
  published 
  his 
  researches 
  

   on 
  the 
  Folkestone 
  Gault, 
  based 
  mainly 
  on 
  De 
  llance's 
  work 
  of 
  1868 
  ; 
  

   in 
  fact, 
  with 
  onlj^ 
  trifling 
  emendations 
  he 
  adopted 
  the 
  zonal 
  classi- 
  

   fication 
  of 
  the 
  beds 
  as 
  first 
  suggested 
  by 
  that 
  author. 
  His 
  work 
  may 
  

   be 
  tabulated 
  as 
  follows, 
  the 
  characteristic 
  Mollusca 
  of 
  each 
  zone, 
  

   mentioned 
  by 
  the 
  author, 
  being 
  also 
  included 
  : 
  — 
  

  

  Upper 
  Gault 
  (about 
  72 
  feet). 
  (Zone 
  of 
  Ammonites 
  rostratus.) 
  

   Cephalopoda 
  : 
  Ainmonites 
  Goodhalli, 
  rostrattis, 
  varians. 
  Pelecy- 
  

   poda 
  : 
  Inocerainus 
  Crippsi 
  ; 
  Pecten 
  Raulinianus. 
  (Zone 
  of 
  

   Kingenalima.) 
  Cephalopoda: 
  Ammonites 
  rostratus. 
  Pelecypoda: 
  

   Plicatula 
  pectinoides. 
  Brachiopoda 
  : 
  Kingena 
  lima. 
  (Zone 
  of 
  

   Ammonites 
  varicosus.) 
  Cephalopoda: 
  Ammotiites 
  varicosns, 
  

   rostratus. 
  Pelecypoda 
  : 
  Inoceramus 
  sulcatus, 
  suhsulcatics. 
  

  

  Junction 
  Bed 
  (zone 
  of 
  Ammonites 
  cristatiis). 
  Cephalopoda: 
  

   Ammonites 
  Beudanti, 
  cristattis. 
  Pelecypoda: 
  Pholas 
  Sanctcecrucis; 
  

   Mytilus 
  GaUiennei; 
  Cucullcea 
  glahra; 
  Cgpri^ia 
  quadrata. 
  

  

  Lower 
  Gault 
  (about 
  28 
  feet). 
  (Zone 
  of 
  Ammonites 
  atiritus.') 
  

   Gastropoda: 
  Pteroceras 
  hicarinatum 
  ; 
  Fnsus 
  indeoisus 
  ; 
  Aporrhais 
  

   Parkijisoni. 
  Pelecypoda 
  : 
  Nucula 
  hivirgata, 
  ornatissima. 
  (Zone 
  

   of 
  Ammonites 
  denarius.) 
  Cephalopoda 
  : 
  Ammonites 
  cornutus, 
  

   denarius; 
  Turrilites 
  Lugardianns. 
  (Zone 
  of 
  Ammotiites 
  lauttis.) 
  

   Cephalopoda 
  : 
  Ammonites 
  lautus. 
  Gastropoda 
  : 
  Solarium 
  monili- 
  

   ferum 
  ; 
  Pliasiandla 
  ervyna. 
  (Zone 
  of 
  Ammonites 
  Belaruei.) 
  

   Cephalopoda: 
  Ammonites 
  Belaruei. 
  Gastropoda: 
  Natica 
  ohliqiia 
  ; 
  

   Fnsus 
  gaultinus 
  ; 
  Arellana 
  pulchella. 
  (Zone 
  of 
  Crustacea 
  — 
  

   Palaocorystes.) 
  Cephalopoda: 
  Hamites 
  attemiatus. 
  Pelecypoda: 
  

   I^eda 
  allied 
  to 
  solea 
  ; 
  Pinna 
  tetragona. 
  (Zone 
  of 
  Ammonites 
  

   ■ 
  auritus, 
  var.) 
  Cephalopoda: 
  Ammonites 
  aiirilics, 
  var. 
  Gastro- 
  

   poda: 
  Cerithium 
  trimonile; 
  Fusus 
  itierianus; 
  Aporrhais 
  calearata. 
  

   Pelecypoda: 
  Lucina 
  tentra; 
  Corlula 
  gaultina; 
  Area 
  nana; 
  Nucula 
  

   pectinata. 
  (Zone 
  of 
  Ammonites 
  interruptus.) 
  Cephalopoda 
  : 
  

   Ammonites 
  interruptus 
  ; 
  Crioceras 
  astierianum; 
  Hamites 
  rotundus. 
  

  

  At 
  the 
  base 
  was 
  recognized 
  the 
  zone 
  of 
  Ammonites 
  mammillaris 
  and 
  

   regarded 
  as 
  belonging 
  to 
  the 
  Lower 
  Greensand 
  or 
  Upper 
  jSTeocomian. 
  

  

  ^ 
  Quart. 
  Journ. 
  Geol. 
  Soc, 
  vol. 
  xxx, 
  p. 
  342, 
  1874, 
  and 
  a 
  separately 
  published 
  

   work 
  on 
  The 
  Gault, 
  1879. 
  

  

  