﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  1 
  1 
  7 
  

  

  in 
  common 
  with 
  that 
  of 
  the 
  Lower 
  Calcareous 
  Grit. 
  This 
  is 
  especi- 
  

   ally 
  the 
  case 
  in 
  the 
  eastern 
  districts 
  ; 
  the 
  maximum 
  thickness 
  of 
  the 
  

   Lower 
  Limestones 
  near 
  Kirkby 
  Moorside 
  is 
  about 
  150 
  feet. 
  

  

  The 
  Middle 
  Calcareous 
  Grit 
  is 
  irregular 
  and 
  uncertain 
  ; 
  it 
  occurs 
  

   at 
  Filey 
  Brig. 
  No 
  certain 
  indication 
  of 
  the 
  Middle 
  Grit 
  is 
  to 
  he 
  

   seen 
  in 
  the 
  Howardian 
  hills. 
  

  

  The 
  Upper 
  Limestones 
  (not 
  seen 
  on 
  the 
  coast) 
  are 
  throughout 
  

   divisible 
  into 
  Coralline 
  Oolite 
  and 
  the 
  overlying 
  Coral 
  Bag. 
  They 
  

   contain 
  peculiar 
  fossils 
  ; 
  east 
  of 
  the 
  Derwent 
  they 
  are 
  thick 
  and 
  rich 
  

   in 
  Echinoidea 
  and 
  Mollusca. 
  

  

  The 
  Supracoralline 
  beds 
  are 
  fully 
  developed 
  and 
  regular 
  ; 
  in 
  the 
  

   arenaceous 
  type, 
  as 
  Upper 
  Calcareous 
  Grit, 
  they 
  " 
  attain 
  their 
  maxi- 
  

   mum 
  thickness 
  in 
  the 
  extreme 
  western 
  bay 
  of 
  the 
  Yale 
  of 
  Picker- 
  

   ing." 
  The 
  Upper 
  Calcareous 
  Grit 
  of 
  Yorkshire 
  possesses 
  peculiar 
  

   features, 
  and 
  contains 
  a 
  series 
  of 
  fossils 
  partially 
  Kimmeridgian. 
  

  

  Messrs. 
  Blake 
  and 
  Hudleston 
  show 
  how 
  inappropriate 
  is 
  the 
  term 
  

   " 
  Coral 
  Bag 
  " 
  as 
  a 
  designation 
  for 
  the 
  whole 
  of 
  the 
  limestones, 
  

   grits, 
  and 
  clays 
  above 
  the 
  Oxford 
  Clay, 
  or 
  between 
  that 
  formation 
  

   and 
  the 
  Kimmeridge 
  Clay. 
  The 
  lower 
  beds 
  of 
  the 
  " 
  Corallian 
  group 
  " 
  

   are 
  markedly 
  Oxfordian 
  in 
  the 
  character 
  of 
  their 
  fauna; 
  and 
  

   before 
  the 
  members 
  of 
  this 
  fauna 
  died 
  out 
  "Kimmeridgian 
  forms 
  

   became 
  their 
  companions, 
  and 
  ultimately 
  supplanted 
  them." 
  Their 
  

   researches 
  have 
  clearly 
  shown 
  us 
  that 
  it 
  is 
  to 
  Yorkshire 
  that 
  we 
  

   must 
  look 
  for 
  our 
  type 
  with 
  which 
  to 
  compare 
  the 
  rocks 
  and 
  fossils 
  

   of 
  the 
  same 
  group 
  through 
  England, 
  ".and 
  thence 
  take 
  our 
  general 
  

   terms." 
  

  

  The 
  authors 
  conclude 
  their 
  elaborately 
  worked-out 
  paper 
  by 
  

   stating 
  succinctly 
  the 
  leading 
  characteristics 
  of 
  each 
  of 
  the 
  six 
  

   groups, 
  and 
  drawing 
  conclusions 
  from 
  their 
  researches 
  (vide 
  Quart. 
  

   Journ. 
  Geol. 
  Soc. 
  vol. 
  xxxiii. 
  pp. 
  389-90). 
  

  

  Eortj^-nine 
  continental 
  species 
  are 
  added 
  to 
  the 
  Molluscan 
  fauna 
  

   of 
  the 
  British 
  Upper 
  Jurassic 
  Bocks, 
  and 
  25 
  new 
  species 
  which 
  have 
  

   occurred 
  to 
  the 
  authors 
  in 
  these 
  rocks 
  during 
  their 
  researches, 
  thus 
  

   adding 
  to 
  the 
  British 
  Upper 
  Jurassic 
  fauna 
  74 
  new 
  forms. 
  Of 
  the 
  

   foreign 
  species 
  21 
  are 
  Gasteropoda 
  and 
  28 
  Lamellibranchiata. 
  

  

  Mr. 
  Hudleston, 
  in 
  the 
  third 
  part 
  of 
  his 
  memoir 
  on 
  the 
  Yorkshire 
  

   Oolites, 
  published 
  in 
  the 
  Proceedings 
  of 
  the 
  Geologists' 
  Association 
  

   in 
  October 
  1878, 
  enumerates 
  no 
  less 
  than 
  288 
  species 
  of 
  all 
  groups 
  

   as 
  occurring 
  in 
  the 
  four 
  divisions 
  of 
  the 
  Corallian 
  Bocks 
  of 
  York- 
  

   shire, 
  viz. 
  

  

  I. 
  The 
  Lower 
  Calc 
  Grit 
  (in 
  part) 
  and 
  Lower 
  Limestone, 
  

  

  II. 
  Coralline 
  Oolite 
  group, 
  

  

  III. 
  Coral 
  Bag, 
  

  

  IV. 
  Supracoralline. 
  

  

  The 
  Lower 
  Calcareous 
  Grit 
  has 
  yielded 
  100 
  species, 
  the 
  Coralline 
  

   Oolite 
  124 
  species, 
  the 
  Coral 
  Bag 
  138 
  species, 
  and 
  the 
  Supracoralline 
  

   22 
  species 
  : 
  40 
  species 
  are 
  Oxfordian, 
  coming 
  up 
  from 
  that 
  horizon 
  

  

  