﻿332 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Apr. 
  27, 
  

  

  The 
  subjacent 
  deposits 
  consist 
  of 
  sands 
  and 
  conglomerate 
  like 
  

   ordinary 
  Shanklin 
  sands, 
  which 
  we 
  will 
  assume 
  it 
  to 
  be, 
  though 
  it 
  

   has 
  already 
  been 
  seen 
  that 
  the 
  upper 
  part 
  is 
  newer. 
  

  

  The 
  chalk 
  above 
  is 
  ordinary 
  lower 
  chalk, 
  with 
  Pecten 
  Beaveri 
  and 
  

   a 
  multitude 
  of 
  characteristic 
  Shells 
  ; 
  hence 
  it 
  might 
  be 
  concluded 
  

   that 
  the 
  Huns'ton 
  Rock 
  represents 
  both 
  Gault 
  and 
  Greensand. 
  But 
  

   as 
  in 
  this 
  district 
  the 
  Gault 
  is 
  the 
  thin 
  end 
  of 
  a 
  wedge 
  which 
  has 
  

   almost 
  disappeared, 
  the 
  chances 
  for 
  Gault 
  being 
  there 
  are 
  not 
  so 
  great 
  

   as 
  are 
  those 
  for 
  the 
  presence 
  of 
  Greensand 
  ; 
  and 
  since 
  the 
  Gault 
  is 
  

   unconformable 
  with 
  the 
  Greensand, 
  if 
  the 
  two 
  formations 
  be 
  there, 
  

   there 
  should 
  be 
  a 
  physical 
  break 
  which 
  ought 
  to 
  be 
  visible. 
  But 
  at 
  

   Huns'ton 
  there 
  is 
  nothing 
  resembling 
  Gault, 
  nothing 
  in 
  the 
  Red 
  Rock 
  

   approaching 
  to 
  heterogeneity 
  ; 
  while 
  the 
  bed 
  is 
  quite 
  homogeneous, 
  

   and 
  has 
  the 
  character 
  of 
  being 
  one 
  formation. 
  This 
  may 
  be 
  Gault 
  

   or 
  Upper 
  Greensand. 
  If 
  it 
  be 
  Gault, 
  it 
  would 
  be 
  unconformable 
  both 
  

   with 
  the 
  beds 
  above 
  and 
  those 
  below 
  ; 
  but 
  of 
  this 
  the 
  section 
  shows 
  

   nothing. 
  Again, 
  if 
  it 
  were 
  Gault, 
  the 
  Upper 
  Greensand 
  would 
  have 
  

   thinned 
  away 
  ; 
  but 
  it, 
  though 
  thin, 
  is 
  the 
  most 
  constant 
  of 
  the 
  Cre- 
  

   taceous 
  beds. 
  And 
  if 
  the 
  bed 
  be 
  unconformable, 
  it 
  is 
  remarkable 
  that 
  

   the 
  sponge-rock 
  should 
  so 
  resemble 
  both 
  Chalk 
  and 
  the 
  Red 
  Rock 
  as 
  

   to 
  make 
  it 
  uncertain 
  how 
  it 
  should 
  be 
  classed. 
  While 
  if 
  the 
  argu- 
  

   ment 
  that 
  the 
  colour 
  be 
  due 
  to 
  glauconite 
  is 
  held 
  as 
  established, 
  it 
  

   is 
  singular 
  that 
  a 
  deposit 
  that 
  has 
  taken 
  on 
  so 
  many 
  other 
  charac- 
  

   teristics 
  of 
  Greensand, 
  without 
  belonging 
  to 
  that 
  formation, 
  should 
  

   have 
  this 
  also. 
  

  

  Under 
  these 
  circumstances, 
  when 
  the 
  material 
  of 
  the 
  rock, 
  its 
  

   conformability, 
  its 
  thickness, 
  its 
  colour, 
  and 
  other 
  features 
  present 
  

   points 
  linking 
  it 
  with 
  Upper 
  Greensand, 
  while 
  there 
  is 
  nothing 
  to 
  

   suggest 
  that 
  it 
  should 
  not 
  be 
  that 
  deposit, 
  and 
  when, 
  in 
  composition, 
  

   physical 
  relations, 
  and 
  colour, 
  it 
  presents 
  aspects 
  which 
  have 
  only 
  

   been 
  observed 
  in 
  the 
  Gault 
  separately 
  in 
  a 
  few 
  isolated 
  localities, 
  

   while 
  there 
  are 
  both 
  cl 
  priori 
  and 
  a 
  fortiori 
  reasons 
  for 
  supposing 
  the 
  

   Gault 
  would 
  thin 
  out, 
  the 
  point 
  seems 
  evident 
  that 
  on 
  stratilogical 
  

   data 
  the 
  Huns'ton 
  Rock 
  must 
  be 
  placed 
  with 
  the 
  Upper 
  Greensand. 
  

  

  In 
  conclusion 
  the 
  author 
  gave 
  a 
  list 
  of 
  the 
  fossils 
  occurring 
  in 
  the 
  

   Red 
  Rock, 
  with 
  their 
  range 
  in 
  the 
  several 
  divisions 
  of 
  the 
  Cretaceous 
  

   system, 
  describing 
  in 
  full 
  the 
  new 
  and 
  more 
  remarkable 
  species. 
  

  

  April 
  27, 
  1864. 
  

  

  Dale 
  Knapping, 
  Esq., 
  Blackheath 
  Park 
  ; 
  Archibald 
  Travers, 
  Esq., 
  

   St. 
  Swithin's 
  Lane, 
  London 
  ; 
  John 
  Plant, 
  Esq., 
  Peel 
  Park, 
  Salford 
  ; 
  

   and 
  Searles 
  Valentine 
  Wood, 
  jun., 
  Esq., 
  Brentwood, 
  Essex, 
  were 
  

   elected 
  Fellows. 
  

  

  The 
  following 
  communications 
  were 
  read 
  : 
  — 
  

  

  