﻿AISTQVEESAEY 
  ADDEESS 
  OF 
  THE 
  PEESIDEjSTT. 
  IO9 
  

  

  2. 
  The 
  Upper 
  Kimmeridge 
  is 
  comparable 
  to 
  the 
  lower 
  portion 
  of 
  

  

  the 
  Yirgulian 
  group 
  of 
  foreign 
  authors. 
  

  

  3. 
  All 
  the 
  great 
  Saurian 
  remains 
  from 
  near 
  Kimmeridge 
  belong 
  

  

  to 
  this 
  portion 
  of 
  the 
  series 
  ; 
  the 
  Paper-shales, 
  Paper-slabs, 
  

   bituminous 
  shales, 
  and 
  cement-stones 
  reach 
  a 
  thickness 
  of 
  

   650 
  feet. 
  

  

  4. 
  No 
  distinct 
  fauna, 
  comparable 
  to 
  that 
  of 
  the 
  Middle-Kimme- 
  

  

  ridge 
  or 
  Pterocerian 
  group, 
  has 
  yet 
  been 
  discovered 
  in 
  

   England, 
  though 
  several 
  of 
  the 
  less 
  peculiar 
  fossils 
  of 
  that 
  

   group 
  are 
  found 
  associated 
  with 
  Lower-Kimmericlge 
  forms. 
  

  

  5. 
  The 
  Lower 
  Kimmeridge 
  is 
  a 
  mass 
  of 
  blue 
  or 
  sandy 
  clay 
  very 
  

  

  little 
  stratified, 
  with 
  numerous 
  calcareous 
  doggers. 
  It 
  is 
  

   largely 
  developed 
  in 
  Lincolnshire, 
  where 
  it 
  shows 
  well- 
  

   marked 
  regions, 
  which 
  exhibit, 
  however, 
  such 
  a 
  gradual 
  

   community 
  of 
  fossils 
  that 
  they 
  cannot 
  be 
  made 
  the 
  basis 
  of 
  

   subdivision, 
  but 
  must 
  be 
  considered 
  local 
  features. 
  The 
  

   whole 
  represents 
  the 
  Astartian 
  group 
  of 
  foreign 
  geologists. 
  

  

  6. 
  The 
  fauna 
  of 
  this 
  section 
  will 
  be 
  found 
  to 
  have 
  been 
  consider- 
  

  

  ably 
  added 
  to. 
  

  

  7. 
  The 
  Kimmeridge 
  Passage-beds 
  are 
  developed 
  only 
  in 
  the 
  pre- 
  

  

  sence 
  of 
  the 
  Coral 
  Eag, 
  whose 
  fossils 
  ascend 
  into 
  them, 
  but 
  

   not 
  to 
  any 
  appreciable 
  extent 
  above. 
  

  

  8. 
  They 
  are 
  typically 
  developed 
  at 
  Weymouth, 
  where 
  they 
  are 
  

  

  about 
  20 
  feet 
  thick. 
  

  

  In 
  January 
  1877, 
  the 
  Eev. 
  J. 
  P. 
  Blake, 
  M.A., 
  E.G.S., 
  and 
  W. 
  H. 
  

   Hudleston, 
  Esq., 
  M.A., 
  E.G.S., 
  laid 
  before 
  the 
  Society 
  their 
  paper 
  

   "On 
  the 
  Corallian 
  Eocks 
  of 
  England"*. 
  Probably 
  no 
  more 
  im- 
  

   portant 
  paper 
  had 
  yet 
  appeared 
  upon 
  the 
  upper 
  part 
  of 
  the 
  Middle 
  

   Jurassic 
  rocks 
  of 
  England, 
  exhaustively 
  written, 
  ably 
  argued, 
  and 
  

   eminently 
  practical. 
  No 
  less 
  than 
  live 
  districts 
  are 
  described 
  in 
  

   every 
  possible 
  detail, 
  viz.: 
  — 
  1. 
  The 
  "Weymouth 
  district; 
  2. 
  The 
  

   North 
  Dorset 
  district 
  ; 
  3. 
  The 
  North 
  "Wiltshire, 
  Berkshire, 
  and 
  

   Oxfordshire 
  range 
  ; 
  4. 
  The 
  Cambridge 
  reef 
  ; 
  and 
  5. 
  The 
  Yorkshire 
  

   basin, 
  this 
  last 
  embracing 
  four 
  subdistricts 
  or 
  areas. 
  

  

  The 
  authors 
  show 
  that 
  the 
  strata 
  from 
  the 
  Oxford 
  Clay 
  to 
  the 
  

   Kimmeridge 
  Clay 
  were 
  one 
  continuous 
  deposit, 
  which, 
  physically 
  

   considered, 
  has 
  been 
  termed 
  a 
  " 
  great 
  pelolithic 
  formation 
  " 
  quietly 
  

   laid 
  down 
  slowly 
  or 
  quickly 
  in 
  the 
  areas 
  named, 
  subject 
  to 
  altera- 
  

   tions 
  in 
  the 
  physical 
  conditions, 
  which 
  changed 
  the 
  character 
  of 
  the 
  

   deposits. 
  That 
  these 
  changes 
  are 
  local 
  is 
  proved 
  by 
  the 
  discon- 
  

   tinuity 
  and 
  variable 
  nature 
  of 
  the 
  deposits, 
  showing 
  also 
  that 
  they 
  

   were 
  not 
  all 
  contemporaneous, 
  or 
  indicative 
  of 
  a 
  period 
  termed 
  

   Corallian, 
  " 
  for 
  all 
  or 
  any 
  of 
  the 
  coral 
  deposits 
  that 
  have 
  been 
  formed 
  

   between 
  the 
  commencement 
  of 
  the 
  Oxfordian 
  and 
  the 
  close 
  of 
  the 
  

   Kimmeridgian 
  epoch." 
  

  

  The 
  "Coral 
  Eag" 
  of 
  England, 
  as 
  these 
  rocks 
  were 
  originally 
  

   designated 
  by 
  "William 
  Smith 
  from 
  their 
  development 
  as 
  such 
  in 
  the 
  

   area 
  studied 
  by 
  him, 
  have 
  now, 
  through 
  minute 
  and 
  careful 
  re- 
  

  

  * 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  1877, 
  vol. 
  xxxiii. 
  pp. 
  260-405. 
  

  

  