﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  

  

  85 
  

  

  assemblage 
  of 
  life 
  hitherto 
  unprecedented 
  in 
  the 
  British 
  rocks. 
  

   Based 
  upon 
  sandstone 
  utterly 
  void 
  of 
  organic 
  remains, 
  and 
  covering 
  

   a 
  vast 
  geographical 
  area, 
  the 
  grey 
  subcrystalline 
  limestone 
  of 
  the 
  

   Cornbrash 
  tells 
  its 
  own 
  tale. 
  It 
  is 
  the 
  landmark 
  of 
  the 
  prac- 
  

   tical 
  geologist; 
  it 
  terminates 
  the 
  vast 
  arenaceous 
  barren 
  estua- 
  

   rine 
  beds 
  which 
  so 
  conspicuously 
  characterize 
  the 
  Lower 
  Jurassic 
  

   rocks 
  of 
  Yorkshire; 
  it 
  is 
  at 
  the 
  base 
  of 
  the 
  Oxfordian 
  group, 
  

   which 
  commences 
  with 
  the 
  Kellaways 
  beds 
  resting 
  immediately 
  

   on 
  the 
  Cornbrash. 
  Whether 
  the 
  Cornbrash 
  exists 
  in 
  the 
  Cave 
  

   district, 
  below 
  the 
  thickly 
  developed 
  Kellaways 
  sands, 
  we 
  have 
  yet 
  

   to 
  learn 
  ; 
  its 
  occurrence 
  in 
  Lincolnshire 
  in 
  the 
  Brigg 
  district 
  is 
  

   certain, 
  but 
  it 
  exists 
  under 
  a 
  very 
  different 
  lithological 
  aspect 
  ; 
  and 
  

   so 
  does 
  the 
  Kellaways. 
  The 
  Molluscan 
  fauna 
  of 
  the 
  Yorkshire 
  Corn- 
  

   brash 
  is 
  large 
  and 
  important 
  : 
  with 
  it 
  cease 
  most 
  of 
  the 
  Lower-Oolite 
  

   species. 
  The 
  appended 
  Table 
  (VII.), 
  including 
  the 
  Cornbrash, 
  nu- 
  

   merically 
  exhibits 
  all 
  the 
  species 
  occurring 
  in 
  Yorkshire, 
  and 
  may 
  

   be 
  a 
  fit 
  termination 
  to 
  the 
  fauna 
  of 
  the 
  Lower 
  Oolite 
  of 
  the 
  York- 
  

   shire 
  coast. 
  I 
  also 
  state 
  the 
  numerical 
  value 
  of 
  the 
  species 
  in 
  the 
  

   following 
  list 
  : 
  — 
  

  

  Genera. 
  Species. 
  

  

  Belemnites 
  1 
  .... 
  1 
  

  

  Ammonites 
  1 
  .... 
  I 
  

  

  Nautilus 
  1 
  ! 
  . 
  . 
  . 
  1 
  

  

  Gasteropoda 
  15 
  .... 
  17 
  

  

  Monomyaria 
  13 
  .... 
  34 
  

  

  Dimyaria 
  24 
  68 
  

  

  Brachiopoda 
  2 
  .... 
  5 
  

  

  Annelida 
  2 
  .... 
  3 
  

  

  Bryozoa 
  4 
  . 
  . 
  , 
  5 
  

  

  Echinoidea 
  4 
  .... 
  6 
  

  

  Ccelenterata 
  2 
  t 
  , 
  . 
  . 
  2 
  

  

  Protozoa 
  2 
  2 
  

  

  71 
  

  

  145 
  

  

  The 
  Lower 
  Oolites 
  are 
  estimated 
  by 
  Mr. 
  Hudleston 
  to 
  measure 
  

   nearly 
  1000 
  feet 
  in 
  thickness 
  as 
  exposed 
  along 
  the 
  coast 
  ; 
  but 
  nowhere 
  

   in 
  the 
  interior 
  of 
  the 
  county 
  are 
  the 
  horizons 
  sufficiently 
  exposed 
  to 
  

   warrant 
  a 
  true 
  estimate. 
  Commencing 
  with 
  the 
  Dogger, 
  they 
  are, 
  

   as 
  given 
  by 
  the 
  author 
  : 
  — 
  

  

  1. 
  Dogger 
  and 
  sands 
  (Blue 
  Wyke) 
  80 
  feet. 
  

  

  2. 
  Lower 
  Shale 
  and 
  Sandstone 
  (Peatt) 
  . 
  . 
  280 
  „ 
  

  

  3. 
  Millepore-bed 
  (Cloughton) 
  12 
  „ 
  

  

  4. 
  Middle 
  Shale 
  and 
  Sandstone 
  (Cloughton) 
  100 
  „ 
  

  

  5. 
  Scarborough 
  Limestone 
  (Cloughton) 
  . 
  . 
  50 
  „ 
  

  

  6. 
  Upper 
  Shale 
  and 
  Sandstone 
  (Spa 
  Cliffs). 
  160 
  „ 
  

  

  7. 
  Cornbrash 
  and 
  shales 
  (Gristhorpe) 
  .... 
  13 
  „ 
  

  

  695 
  „ 
  

   Mr. 
  Hudleston 
  thinks 
  that 
  perhaps 
  these 
  thicknesses 
  are 
  only 
  

   partially 
  maintained 
  in 
  the 
  moorland 
  chain 
  ; 
  whilst 
  in 
  the 
  inland 
  or 
  

  

  