﻿F. 
  G. 
  H. 
  PEICE 
  ON 
  THE 
  GATTLT 
  OP 
  FOLKESTONE. 
  349 
  

  

  The 
  following 
  eight 
  forms 
  make 
  their 
  first 
  appearance 
  in 
  this 
  

   bed:— 
  

  

  Cardita 
  rotundata, 
  Pictet. 
  Actseon 
  affinis, 
  If 
  Orb. 
  

  

  tenuieosta, 
  Sow., 
  G. 
  T. 
  Bellerophina 
  minuta, 
  Sow., 
  M. 
  C. 
  

  

  Nucula 
  Vibrayeana, 
  I)' 
  Orb. 
  Solarium 
  conoideum, 
  Sow. 
  

  

  Avellana 
  inflata, 
  V 
  Orb. 
  Phasianella 
  ervyna, 
  D 
  'Orb. 
  

  

  Resin 
  is 
  also 
  found 
  in 
  this 
  bed. 
  Mr. 
  Hudleston 
  tells 
  me 
  such 
  

   substances, 
  like 
  the 
  Highgate 
  resin, 
  are 
  viewed 
  by 
  Dana 
  as 
  a 
  kind 
  of 
  

   copalite. 
  This 
  resin 
  is 
  wholly 
  volatile, 
  burning 
  with 
  a 
  highly 
  lu- 
  

   minous 
  flame 
  and 
  fragrant 
  odour. 
  It 
  is 
  not 
  appreciably 
  soluble 
  in 
  

   alcohol. 
  

  

  Bed 
  VI. 
  

  

  This 
  bed, 
  commonly 
  styled 
  the 
  " 
  mottled 
  bed," 
  is 
  of 
  small 
  ver- 
  

   tical 
  thickness, 
  being 
  only 
  one 
  foot. 
  It 
  is 
  measured 
  from 
  the 
  top 
  of 
  

   bed 
  V. 
  to 
  a 
  hard 
  seam. 
  The 
  clay 
  is 
  darker 
  than 
  that 
  of 
  the 
  preceding 
  

   bed, 
  and 
  is 
  mottled 
  throughout 
  with 
  lightish-coloured 
  markings. 
  

  

  It 
  may 
  be 
  considered 
  the 
  zone 
  of 
  Ammonites 
  denarius, 
  Sow., 
  M. 
  C, 
  

   as 
  that 
  fossil 
  is 
  frequently 
  met 
  with 
  in 
  it 
  and 
  is 
  of 
  rare 
  occurrence 
  in 
  

   any 
  other 
  bed. 
  The 
  following 
  six 
  forms 
  are 
  peculiar 
  to 
  this 
  zone 
  : 
  — 
  

  

  Honiolopsis 
  Edwardsii, 
  Bell. 
  Turrilites 
  Hugardianus, 
  D' 
  Orb. 
  

  

  Necrocarcinus 
  Bechei, 
  Beslong. 
  Ammonites 
  cornutus, 
  Pictet 
  (a 
  small 
  

   Fusus 
  elegans, 
  D' 
  Orb. 
  variety). 
  

  

  Scalaria 
  gastyna, 
  If 
  Orb. 
  

  

  Bed 
  VII. 
  

  

  The 
  top 
  bed 
  of 
  the 
  Lower 
  Gault 
  is 
  measured 
  from 
  the 
  hard 
  seam 
  

   constituting 
  the 
  limit 
  of 
  bed 
  VI. 
  up 
  to 
  the 
  first 
  line 
  of 
  nodules 
  forming 
  

   the 
  base 
  of 
  the 
  junction-bed. 
  It 
  is 
  6 
  feet 
  2 
  inches 
  in 
  thickness, 
  and 
  

   is 
  usually 
  called 
  the 
  " 
  dark 
  bed 
  " 
  from 
  its 
  very 
  dark 
  colour, 
  although 
  

   it 
  is 
  not 
  so 
  dark 
  as 
  bed 
  II., 
  neither 
  do 
  the 
  fossils 
  bear 
  so 
  rich 
  a 
  colour 
  

   as 
  they 
  do 
  in 
  the 
  latter. 
  

  

  This 
  bed 
  is 
  highly 
  fossiliferous, 
  containing 
  as 
  many 
  as 
  67 
  species 
  ; 
  

   it 
  is 
  especially 
  rich 
  in 
  Gasteropoda, 
  and 
  possesses 
  six 
  species 
  peculiar 
  

   to 
  it, 
  namely 
  : 
  — 
  

  

  Nucula 
  albensis, 
  If 
  Orb. 
  Avellana 
  Dupiniana 
  ? 
  D'Orb. 
  

   Aporrhais 
  Parkinsoni, 
  Sow. 
  Cerithium 
  tectum, 
  If 
  Orb. 
  

   Fusus 
  indecisus, 
  U 
  Orb. 
  Phillipsi 
  ? 
  Leym. 
  

  

  There 
  are 
  likewise 
  three 
  well-marked 
  forms 
  which 
  make 
  their 
  

   first 
  appearance 
  and 
  are 
  abundant 
  in 
  this 
  bed, 
  and 
  pass 
  up 
  into 
  the 
  

   junction-bed 
  above, 
  where 
  they 
  only 
  occur 
  sparsely. 
  These 
  are 
  : 
  — 
  

  

  Nucula 
  bivirgata, 
  Fitton. 
  Buccinum 
  gaultinum, 
  D'Orb. 
  

   ornatissima, 
  D' 
  Orb. 
  

  

  Of 
  the 
  last-named 
  fossil 
  I 
  have 
  thought 
  it 
  well 
  to 
  give 
  figures 
  

   (PI. 
  XXV. 
  figs. 
  1 
  & 
  2), 
  as 
  that 
  given 
  by 
  D'Orbigny 
  in 
  his 
  < 
  Paleon- 
  

   tologie 
  Franchise,' 
  torn. 
  ii. 
  pi. 
  233, 
  is 
  of 
  so 
  fragmentary 
  a 
  character 
  

   as 
  to 
  be 
  difficult 
  to 
  identify 
  with 
  the 
  fine 
  specimens 
  met 
  with 
  in 
  

   this 
  bed. 
  

  

  Ammonites 
  auritus 
  and 
  a 
  variety 
  of 
  the 
  same 
  occur 
  in 
  large 
  quan- 
  

  

  