﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  89 
  

  

  contents. 
  The 
  upper 
  beds 
  are 
  unfossiliferous 
  ; 
  and, 
  as 
  Mr. 
  Hudle- 
  

   ston 
  states, 
  " 
  for 
  purposes 
  of 
  comparison 
  with 
  N.W. 
  Germany, 
  if 
  it 
  

   may 
  he 
  deemed 
  proved 
  from 
  negative 
  evidence 
  that 
  the 
  Ornati 
  do 
  

   not 
  occur 
  higher 
  than 
  the 
  top 
  of 
  the 
  Kelloway 
  rock, 
  we 
  must 
  look 
  

   upon 
  this 
  great 
  thickness 
  of 
  beds 
  as 
  belonging 
  quite 
  as 
  much 
  to 
  the 
  

   Upper 
  as 
  to 
  the 
  Middle 
  Jura 
  of 
  that 
  country." 
  

  

  The 
  fossils 
  given 
  in 
  Mr. 
  Hudleston's 
  paper 
  are 
  numerically 
  as 
  

   follows, 
  and 
  represent 
  only 
  7 
  classes 
  : 
  — 
  

  

  Genera. 
  Species. 
  

  

  1 
  .... 
  3 
  

  

  1 
  .... 
  11 
  

   4 
  .... 
  5 
  

   6 
  .... 
  10 
  

  

  11 
  .... 
  13 
  

  

  2 
  .... 
  2 
  

  

  Belemnites 
  . 
  . 
  . 
  

   Ammonites 
  . 
  

   Gasteropoda 
  . 
  

   Monomyaria 
  . 
  

   Dimyaria 
  . 
  . 
  . 
  

   Brachiopoda 
  . 
  

   Crinoidea 
  traces. 
  

  

  25 
  .... 
  44 
  

  

  Lower 
  Calcareous 
  Grit. 
  — 
  The 
  mass 
  of 
  material 
  gone 
  over 
  by 
  Mr. 
  

   Hudleston 
  for 
  this 
  and 
  the 
  Corallian 
  group 
  can 
  only 
  be 
  estimated 
  by 
  

   those 
  who 
  know 
  the 
  rocks 
  and 
  the 
  area 
  they 
  occupy. 
  The 
  Oxford 
  Clay 
  

   in 
  its 
  uppermost 
  limit 
  becomes 
  gradually 
  more 
  sandy 
  ; 
  the 
  typical 
  

   Lower 
  Calcareous 
  Grit 
  commences 
  with 
  induration, 
  and 
  forms 
  a 
  

   " 
  mural 
  cap 
  of 
  hard 
  yellow 
  rock 
  " 
  to 
  the 
  grey 
  underlying 
  Oxford 
  Clay. 
  

   It 
  is 
  seen 
  in 
  the 
  tabular 
  range, 
  the 
  Howardian 
  hills, 
  in 
  Castle 
  Howard 
  

   and 
  Hovingham 
  Park, 
  &c. 
  The 
  subdivisions 
  are 
  penological, 
  not 
  

   palseontological. 
  Mr. 
  Hudleston 
  states 
  that, 
  " 
  taken 
  all 
  together, 
  

   the 
  Lower 
  Calcareous 
  Grit 
  occupies 
  more 
  ground 
  in 
  Yorkshire 
  than 
  

   any 
  other 
  member 
  of 
  the 
  series 
  between 
  the 
  Lower 
  Oolites 
  and 
  the 
  

   Kimmeridge 
  Clay." 
  That 
  the 
  Calc 
  Grit 
  constitutes 
  the 
  base 
  of 
  the 
  

   Corallian 
  series, 
  and 
  represents 
  the 
  commencement 
  of 
  the 
  " 
  White 
  

   Jura 
  " 
  of 
  the 
  continent, 
  there 
  cannot 
  be 
  any 
  doubt. 
  Physical 
  condi- 
  

   tions 
  had 
  and 
  have 
  more 
  to 
  do 
  with 
  determining 
  the 
  Molluscan 
  life 
  

   over 
  a 
  given 
  area 
  than 
  perhaps 
  any 
  other 
  cause. 
  That 
  this 
  was 
  the 
  

   case 
  with 
  the 
  Passage-beds 
  into 
  the 
  Coralline 
  Oolite 
  seems 
  highly 
  

   probable. 
  Mr. 
  Hudleston 
  appends 
  a 
  list 
  of 
  Lower 
  Calc 
  Grit 
  fossils, 
  

   which 
  he 
  says 
  is 
  by 
  no 
  means 
  exhaustive, 
  but 
  intended 
  to 
  give 
  a 
  

   fair 
  idea 
  of 
  the 
  facies 
  of 
  the 
  fauna 
  (Joe. 
  cit. 
  pp. 
  388-390 
  for 
  specific 
  

   names). 
  The 
  following 
  statement 
  indicates 
  the 
  numerical 
  proportions 
  

   of 
  the 
  genera 
  and 
  species 
  : 
  — 
  

  

  