﻿604 
  MR. 
  G. 
  W. 
  LAMPLUGH 
  ON 
  THE 
  

  

  band 
  for 
  a 
  passage 
  of 
  the 
  clays 
  into 
  the 
  true 
  Eed 
  Chalk. 
  The 
  

   crushed 
  Eed 
  Chalk 
  resting 
  on 
  the 
  clayey 
  beds 
  in 
  this 
  exposure 
  may 
  

   not 
  be 
  in 
  place, 
  and, 
  indeed, 
  in 
  this 
  case 
  probably 
  is 
  not 
  ; 
  but 
  the 
  

   dull 
  red 
  band 
  two 
  feet 
  below 
  it 
  might 
  really 
  be 
  described 
  as 
  a 
  

   clayey 
  red 
  chalk, 
  and 
  is 
  evidently 
  of 
  the 
  nature 
  of 
  a 
  passage-bed. 
  

   The 
  presence 
  above 
  this 
  chalky 
  clay 
  of 
  at 
  least 
  two 
  feet 
  of 
  the 
  dark 
  

   mottled 
  shales 
  with 
  glauconite, 
  which 
  bear 
  far 
  more 
  resemblance 
  

   to 
  the 
  Neocomian 
  clays 
  than 
  they 
  do 
  to 
  the 
  Eed 
  Chalk, 
  shows 
  un- 
  

   mistakably 
  that 
  there 
  were 
  alternating 
  conditions 
  before 
  the 
  Eed 
  

   Chalk 
  proper 
  began 
  to 
  form. 
  The 
  state 
  of 
  preservation 
  of 
  the 
  

   fossils, 
  though 
  perhaps 
  not 
  of 
  much 
  consequence, 
  deserves 
  mention 
  

   as 
  evidence 
  in 
  the 
  same 
  direction. 
  In 
  some 
  of 
  the 
  layers 
  the 
  

   fossils 
  are 
  preserved 
  in 
  a 
  semi 
  crystalline 
  condition, 
  as 
  in 
  the 
  Eed 
  

   Chalk 
  ; 
  while 
  in 
  others 
  interstratiiied 
  with 
  them 
  the 
  shell-substance 
  

   remains 
  as 
  a 
  white 
  opaque 
  impression 
  in 
  the 
  clays, 
  as 
  is 
  usual 
  in 
  

   the 
  Neocomian 
  Clays 
  below. 
  

  

  In 
  these 
  marls 
  there 
  seems 
  to 
  be 
  much 
  extraneous 
  gritty 
  matter, 
  

   and 
  all 
  are 
  streaked 
  and 
  dappled 
  with 
  glaucouite. 
  In 
  the 
  dull 
  

   red 
  band 
  small 
  smooth 
  pebbles 
  (lydites) 
  not 
  larger 
  than 
  duck- 
  shot 
  

   have 
  been 
  observed 
  *. 
  

  

  The 
  fauna 
  of 
  the 
  Speeton 
  marly 
  beds 
  is 
  limited, 
  but 
  very 
  inter- 
  

   esting, 
  and 
  we 
  may 
  hope 
  that 
  future 
  exposures 
  will 
  enable 
  us 
  to 
  

   lengthen 
  the 
  list. 
  During 
  1886 
  and 
  1887 
  I 
  saw 
  several 
  small 
  

   exposures 
  of 
  marly 
  clays 
  with 
  green 
  streaks 
  among 
  the 
  rocks 
  on 
  

   the 
  beach 
  to 
  the 
  eastward 
  of 
  these 
  slips, 
  close 
  under 
  the 
  chalk 
  

   escarpment, 
  and, 
  though 
  I 
  had 
  not 
  then 
  learned 
  to 
  recognize 
  them, 
  

   these 
  were 
  probably 
  the 
  same 
  beds, 
  in 
  place, 
  as 
  those 
  just 
  de- 
  

   scribed. 
  The 
  furthest 
  eastward 
  of 
  these 
  was 
  at 
  half-tide 
  nearly 
  

   opposite 
  to 
  Nanny 
  Goat's 
  House; 
  but 
  as 
  this 
  exposure 
  was 
  in 
  a 
  

   waterpool 
  it 
  was 
  difficult 
  to 
  examine. 
  Fossiliferous 
  Upper 
  Neo- 
  

   comian 
  beds, 
  with 
  B. 
  semicanaliculatus 
  ?, 
  Rostellaria 
  Phillipsii, 
  

   Cucullcea 
  securis, 
  &c, 
  have 
  occasionally 
  been 
  poorly 
  exposed 
  within 
  

   a 
  short 
  distance 
  of 
  these 
  marly 
  beds, 
  striking 
  in 
  the 
  same 
  direction. 
  

  

  The 
  following 
  species 
  have 
  been 
  identified 
  in 
  my 
  collection 
  from 
  

   the 
  marls 
  : 
  — 
  

  

  Belemnites 
  minimus, 
  List. 
  Ostrea, 
  sp. 
  

  

  attenuatus, 
  Sow. 
  Avicula 
  Rauliniaua 
  ?, 
  D'Orb. 
  

  

  ultimus, 
  jyOrb. 
  

  

  Inoceramus 
  concentricus, 
  Park. 
  

  

  sulcatus, 
  var. 
  ?, 
  Park. 
  

  

  , 
  sp. 
  (a 
  larger 
  form). 
  

  

  Nucula 
  pectinata 
  ?, 
  Sow. 
  

   Lingula, 
  sp. 
  

  

  Vermiculariaelongata, 
  Bean, 
  MS.\ 
  

   Fish 
  (scales). 
  

  

  This 
  list, 
  though 
  limited, 
  shows 
  clearly 
  the 
  affinity 
  of 
  the 
  beds 
  to 
  

   the 
  Eed 
  Chalk, 
  and 
  those 
  species, 
  such 
  as 
  Bel. 
  attenuatus, 
  Inoceramus 
  

   concentricus, 
  &c, 
  which 
  are 
  not 
  found 
  in 
  the 
  Eed 
  Chalk 
  at 
  Speeton 
  

   are 
  still 
  forms 
  well 
  known 
  in 
  the 
  Gault, 
  which 
  is 
  agreed 
  to 
  be, 
  in 
  

   part 
  at 
  any 
  rate, 
  a 
  synchronous 
  formation. 
  

  

  The 
  possibility 
  of 
  a 
  representative 
  of 
  the 
  Gault 
  other 
  than 
  the 
  

  

  * 
  In 
  colour 
  and 
  some 
  other 
  characteristics, 
  as 
  also 
  in 
  sti'ati 
  graphical 
  position, 
  

   these 
  marls 
  seem 
  somewhat 
  to 
  resemble 
  the 
  " 
  Flammen-Mergel 
  " 
  of 
  Germany, 
  

   t 
  Figured 
  in 
  Kev. 
  T. 
  Wiltshire's 
  'Eed 
  Chalk,' 
  pi. 
  iii. 
  figs. 
  1, 
  la. 
  

  

  