﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  

  

  81 
  

  

  Upper 
  Lias 
  and 
  the 
  Dogger 
  above. 
  No 
  previous 
  writer 
  has 
  dealt 
  with 
  

   the 
  details 
  of 
  the 
  Lower 
  Oolites 
  of 
  Yorkshire 
  with 
  the 
  same 
  minute- 
  

   ness 
  as 
  Mr. 
  Hudleston 
  ; 
  and 
  he 
  has 
  equally 
  well 
  marked 
  out 
  the 
  higher 
  

   members 
  of 
  the 
  Jurassic 
  group, 
  which 
  I 
  shall 
  have 
  occasion 
  to 
  refer 
  

   to 
  at 
  some 
  length. 
  

  

  The 
  Lower 
  Oolites, 
  as 
  above 
  stated, 
  are 
  divided 
  into 
  four 
  groups. 
  

   The 
  base 
  is 
  known 
  as 
  the 
  " 
  Dogger 
  * 
  or 
  Inferior 
  Oolite. 
  The 
  Lower 
  

   Shale 
  and 
  /Sandstones, 
  about 
  300 
  feet 
  in 
  thickness, 
  succeed 
  the 
  

   Dogger 
  : 
  these 
  are 
  entirelv 
  estuarine, 
  and 
  contain 
  no 
  marine 
  fauna 
  ; 
  

   but 
  an 
  abundant 
  cryptogamic 
  flora 
  must 
  have 
  occurred 
  inland 
  

   near 
  where 
  these 
  sandy 
  shales 
  were 
  deposited. 
  Capping 
  these 
  Lower 
  

   Estuarine 
  arenaceous 
  beds, 
  is 
  the 
  first 
  marine 
  horizon 
  above 
  the 
  

   Dogger, 
  known 
  by 
  the 
  name 
  of 
  the 
  "Millepore 
  bed 
  ; 
  " 
  this 
  may 
  possibly 
  

   belong 
  to 
  the 
  same 
  series, 
  or 
  it 
  may 
  be 
  correlated 
  with 
  the 
  Whit- 
  

   well 
  Limestones 
  of 
  the 
  Howardian 
  Hills. 
  It 
  is 
  traceable 
  under 
  

   varying 
  conditions 
  through 
  the 
  western 
  and 
  northern 
  areas, 
  either 
  

   through 
  its 
  oblique 
  lamination, 
  or 
  the 
  comminuted 
  condition 
  of 
  its 
  

   fossil 
  contents 
  ; 
  the 
  Bryozoon 
  Spiropora 
  (Millepora 
  Cricopora) 
  stra- 
  

   minea 
  everywhere 
  characterizes 
  this 
  bed, 
  whence 
  the 
  name. 
  No 
  less 
  

   than 
  22 
  genera 
  and 
  36 
  species 
  of 
  Bivalves 
  have 
  been 
  determined 
  

   from 
  the 
  " 
  Millepore 
  bed," 
  8 
  genera 
  and 
  9 
  species 
  of 
  Gasteropoda, 
  

   and 
  4 
  genera 
  and 
  4 
  species 
  of 
  Echinoidea, 
  besides 
  species 
  of 
  other 
  and 
  

   lower 
  groups 
  ; 
  the 
  most 
  abundant 
  fossils 
  are 
  Lima 
  duplicata, 
  Tri- 
  

   gonia 
  reticosta, 
  Ceromya 
  Bajociana, 
  Mgacites 
  reeurva, 
  Pholadomya 
  

   Heraulti 
  and 
  P. 
  Scemani. 
  Pygaster 
  semisulcatus 
  is 
  the 
  chief 
  Echinoid 
  ; 
  

   and 
  Gonioseins 
  angulata 
  is 
  the 
  only 
  Coral 
  known. 
  Mr. 
  Hudleston 
  

   believes 
  that 
  it 
  is 
  more 
  than 
  probable 
  that 
  the 
  " 
  Millepore 
  group 
  ' 
  

   may 
  represent 
  the 
  " 
  Cave 
  Oolite," 
  and 
  consequently 
  the 
  " 
  Lincoln- 
  

   shire 
  Limestone 
  ;" 
  and 
  the 
  presence 
  of 
  the 
  Lower 
  and 
  Upper 
  Estua- 
  

   rine 
  series 
  in 
  Lincolnshire, 
  and 
  their 
  great 
  extension 
  northwards 
  

   into 
  Yorkshire, 
  above 
  and 
  below 
  the 
  Millepore 
  series, 
  furnishes 
  

   good 
  and 
  reasonable 
  grounds 
  for 
  this 
  supposition. 
  The 
  Scarborough 
  

   or 
  Grey 
  Limestone, 
  in 
  some 
  places, 
  is 
  less 
  than 
  100 
  feet 
  above 
  the 
  

   Millepore 
  series 
  ; 
  and 
  the 
  intervention 
  of 
  the 
  plant-beds 
  goes 
  far 
  

   to 
  show 
  the 
  shallowness 
  of 
  the 
  area 
  that 
  underwent 
  so 
  many 
  alter- 
  

   nations 
  of 
  level. 
  The 
  Grey 
  Limestone 
  may, 
  under 
  modification, 
  repre- 
  

   sent 
  the 
  zone 
  of 
  Am. 
  Humpliresianus 
  or 
  the 
  upper 
  portion 
  of 
  the 
  

   Lincolnshire 
  Limestone 
  ; 
  but 
  the 
  Yorkshire 
  type 
  has 
  not 
  yet 
  been 
  

   detected 
  south 
  of 
  the 
  Humber. 
  The 
  fossils 
  of 
  the 
  Dogger 
  and 
  Mille- 
  

   pore 
  bed 
  are 
  numerically 
  given 
  in 
  a 
  subsequent 
  Table 
  (VII. 
  p. 
  84), 
  

   side 
  by 
  side 
  with 
  those 
  of 
  the 
  Grey 
  Limestone 
  and 
  the 
  Cornbrash 
  ; 
  

   their 
  numbers 
  are 
  expressed 
  here 
  by 
  the 
  formula 
  I 
  have 
  adopted 
  ; 
  

   they 
  are 
  for 
  the 
  Dogger 
  | 
  jj, 
  the 
  Millepore 
  bed 
  jj 
  f, 
  the 
  Grey 
  Limestone 
  

   | 
  § 
  , 
  and 
  the 
  Cornbrash 
  ^ 
  . 
  Thus, 
  so 
  far 
  as 
  collecting 
  goes, 
  the 
  Dogger 
  

   and 
  the 
  Grey 
  Limestone 
  are 
  equally 
  prolific, 
  though 
  the 
  fauna 
  differs. 
  

   The 
  poverty 
  of 
  the 
  Cephalopoda 
  is 
  strikingly 
  shown 
  in 
  this 
  Table 
  ; 
  yet 
  

   the 
  largest 
  species 
  of 
  Belemnite 
  (B. 
  giganteus) 
  in 
  the 
  British 
  rocks 
  

   occurs 
  in 
  the 
  Grey 
  or 
  Scarborough 
  limestone. 
  Above 
  the 
  principal 
  

   ; 
  ' 
  Carbonaceous 
  " 
  groups 
  of 
  the 
  Lower 
  Oolites 
  is 
  the 
  " 
  Middle 
  Shale 
  

   and 
  Sandstone 
  series," 
  above 
  the 
  Millepore 
  beds, 
  and 
  below 
  the 
  Scar- 
  

  

  vol. 
  xxxviii. 
  h 
  

  

  

  