﻿60 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  attempt 
  on 
  the 
  continent 
  to 
  describe 
  its 
  fauna 
  and 
  flora 
  on 
  an 
  ex- 
  

   tensive 
  scale. 
  

  

  It 
  may 
  appear 
  invidious 
  to 
  mention, 
  amongst 
  the 
  numerous 
  and 
  

   valuable 
  communications 
  to 
  the 
  ' 
  Quarterly 
  Journal 
  ' 
  of 
  our 
  Society, 
  

   any 
  special 
  papers 
  on 
  Jurassic 
  geology 
  that 
  have 
  had 
  marked 
  

   influence 
  upon 
  the 
  progress 
  of 
  this 
  division 
  of 
  geology 
  and 
  palaeon- 
  

   tology 
  during 
  the 
  past 
  twenty 
  years. 
  In 
  doing 
  so, 
  however, 
  I 
  

   regard 
  them 
  as 
  having 
  influenced 
  and 
  furthered 
  the 
  progress 
  of 
  

   exact 
  knowledge 
  in 
  no 
  small 
  degree. 
  It 
  is 
  through 
  such 
  detailed 
  

   research 
  and 
  minute 
  investigation 
  that 
  palaeontology 
  has 
  taken 
  its 
  

   high 
  stand 
  amongst 
  the 
  natural 
  sciences. 
  A 
  critical 
  acquaintance 
  

   with 
  species 
  is 
  now 
  essential 
  to 
  rightly 
  correlate 
  both 
  the 
  Jurassic, 
  

   Cretaceous, 
  and 
  Cainozoic 
  deposits 
  of 
  the 
  British 
  islands 
  with 
  those 
  

   of 
  the 
  continent; 
  and 
  at 
  no 
  time 
  during 
  the 
  past 
  twenty 
  years 
  

   has 
  so 
  much 
  been 
  expected 
  from 
  students 
  of 
  Secondary 
  and 
  Tertiary 
  

   paheontology. 
  

  

  It 
  is 
  my 
  intention 
  therefore 
  to 
  broadly 
  trace 
  the 
  history 
  and 
  

   development 
  of 
  Jurassic 
  geology 
  and 
  palaeontology 
  during 
  the 
  past 
  

   twenty 
  years, 
  and 
  bring 
  down 
  to 
  the 
  present 
  time 
  the 
  elaborate 
  

   details 
  that 
  have 
  accumulated. 
  I 
  do 
  so 
  upon 
  the 
  plan 
  of 
  my 
  last 
  

   year's 
  Address, 
  believing 
  that 
  in 
  doing 
  so 
  I 
  convey 
  to 
  the 
  Fellows 
  

   of 
  our 
  Society 
  that 
  kind 
  of 
  analysis 
  which 
  may 
  be 
  useful, 
  the 
  

   materials 
  for 
  which 
  I 
  have 
  long 
  possessed 
  and 
  have 
  now 
  worked 
  up 
  

   for 
  my 
  present 
  Address. 
  

  

  The 
  correlation 
  and 
  identification 
  of 
  rocks 
  widely 
  separated, 
  even 
  

   in 
  the 
  British 
  islands, 
  is 
  attended 
  with 
  no 
  small 
  difficulty, 
  unless 
  

   the 
  specific 
  contents 
  of 
  the 
  strata 
  are 
  clearly 
  understood, 
  and 
  the 
  

   more 
  minute 
  particulars 
  upon 
  which 
  identification 
  is 
  based 
  are 
  care- 
  

   fully 
  detailed. 
  This 
  is 
  at 
  once 
  manifest 
  in 
  attempting 
  to 
  deter- 
  

   mine 
  the 
  history 
  and 
  relations 
  of 
  the 
  Lias 
  of 
  the 
  south 
  coast 
  of 
  

   England 
  at 
  Lyme 
  Regis 
  with 
  that 
  of 
  the 
  Yorkshire 
  coast, 
  where 
  the 
  

   physical 
  characters 
  and 
  aspect 
  of 
  the 
  whole 
  stratigraphical 
  series 
  

   entirely 
  differ. 
  

  

  In 
  1860 
  Dr. 
  Wright 
  prepared 
  an 
  important 
  paper 
  upon 
  " 
  The 
  

   subdivisions 
  of 
  the 
  Inferior 
  Oolite 
  in 
  the 
  south 
  of 
  England 
  com- 
  

   pared 
  with 
  the 
  equivalent 
  beds 
  of 
  that 
  formation 
  on 
  the 
  York- 
  

   shire 
  coast 
  " 
  *. 
  None 
  but 
  an 
  accomplished 
  palaeontologist 
  could 
  

   have 
  attempted 
  this 
  with 
  any 
  chance 
  of 
  success, 
  the 
  physical 
  differ- 
  

   ences 
  being 
  so 
  extreme 
  even 
  over 
  so 
  small 
  an 
  area. 
  The 
  marine 
  beds 
  

   interstratified 
  with 
  the 
  largely 
  developed 
  Estuarine 
  series 
  enable 
  us, 
  

   through 
  the 
  three 
  Ammonite-zones, 
  typically 
  developed 
  in 
  the 
  south 
  

   and 
  middle 
  of 
  England 
  (Cheltenham 
  area 
  &c), 
  to 
  read 
  correctly 
  the 
  

   more 
  obscure 
  and 
  abnormal 
  conditions 
  of 
  the 
  Lower 
  Jurassic 
  rocks 
  

   north 
  of 
  the 
  Humber, 
  which, 
  compared 
  amongst 
  themselves, 
  have 
  

   little 
  or 
  no 
  value 
  in 
  stratigraphical 
  geology. 
  The 
  more 
  correct 
  

   reading 
  of 
  the 
  Jurassic 
  fragments 
  on 
  the 
  western 
  and 
  eastern 
  sides 
  

   of 
  Scotland, 
  through 
  the 
  careful 
  investigations 
  of 
  Prof. 
  Judd, 
  has 
  

   led 
  to 
  their 
  being 
  correlated 
  by 
  that 
  geologist 
  with 
  almost 
  every 
  

   division 
  of 
  the 
  Jurassic 
  system. 
  Probably 
  no 
  work 
  done 
  in 
  modern 
  

   * 
  Quart. 
  Journ. 
  Greol. 
  Soc. 
  yol. 
  xvi. 
  p. 
  1 
  (1860). 
  

  

  

  