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  tinuity 
  of 
  these 
  beds 
  beyond 
  Stamford 
  ; 
  and 
  they 
  are 
  now 
  determined 
  

   beyond 
  or 
  north 
  of 
  the 
  Humber. 
  The 
  author 
  also 
  describes 
  the 
  

   interposition, 
  detected 
  by 
  Prof. 
  Judd, 
  of 
  the 
  Lower 
  and 
  Upper 
  

   Estuarine 
  series, 
  a 
  matter 
  of 
  high 
  moment 
  in 
  the 
  history 
  of 
  the 
  

   Northamptonshire 
  Oolites. 
  The 
  Lower 
  belongs 
  to 
  the 
  Inferior 
  

   Oolite, 
  and 
  the 
  Upper 
  to 
  the 
  Great 
  Oolite. 
  Near 
  Northampton 
  

   these 
  two 
  freshwater 
  or 
  Estuarine 
  series 
  come 
  together. 
  In 
  

   Oxfordshire 
  the 
  Upper 
  Estuarine 
  series 
  is 
  traceable 
  up 
  to 
  the 
  

   " 
  Stonesfield 
  Slate 
  ; 
  " 
  and 
  the 
  great 
  difficulty 
  experienced 
  in 
  sepa- 
  

   rating 
  the 
  two 
  Estuarines 
  in 
  Oxfordshire 
  arose 
  from 
  the 
  fact 
  that 
  the 
  

   Northampton 
  Sand 
  was 
  considered 
  equivalent 
  to 
  the 
  Stonesfield 
  Slate. 
  

   We 
  must 
  remember 
  that 
  formerly 
  few 
  of 
  the 
  fossils 
  composing 
  

   the 
  large 
  fauna 
  of 
  the 
  Northampton 
  Sand 
  were 
  known 
  ; 
  it 
  was 
  

   through 
  the 
  labour 
  of 
  Mr. 
  Sharp, 
  and 
  the 
  inferences 
  drawn 
  from 
  

   his 
  splendid 
  collection, 
  that 
  this 
  long-pending 
  question 
  was 
  settled, 
  

   and 
  the 
  relations 
  of 
  the 
  Northampton-Sand 
  beds, 
  the 
  Coliyweston 
  

   Slate 
  and 
  Stonesfield 
  Slate, 
  and 
  Lincolnshire 
  Limestone 
  to 
  each 
  other 
  

   were 
  determined 
  ; 
  and 
  this 
  was 
  a 
  great 
  step 
  towards 
  the 
  true 
  classi- 
  

   fication 
  of 
  the 
  Lower 
  Oolites 
  of 
  England. 
  Prior 
  to 
  this 
  it 
  was 
  

   believed 
  that 
  the 
  Great-Oolite 
  Limestone 
  of 
  the 
  tableland 
  of 
  the 
  

   Northampton 
  district 
  was 
  identical 
  with 
  the 
  Limestones 
  which 
  

   occur 
  between 
  Kettering 
  and 
  Stamford, 
  extending 
  on 
  through 
  Rut- 
  

   land 
  and 
  Lincolnshire 
  into 
  South 
  Yorkshire 
  (Cave 
  district) 
  ; 
  also 
  that 
  

   this 
  Limestone 
  belonged 
  to 
  the 
  Great 
  Oolite 
  ; 
  and 
  that 
  the 
  Calcareo- 
  

   arenaceous 
  Slate 
  of 
  Coliyweston 
  and 
  Easton, 
  which 
  immediately 
  un- 
  

   derlies 
  this 
  Limestone, 
  was 
  the 
  equivalent 
  of 
  the 
  Stonesfield 
  Slate 
  

   of 
  Oxfordshire. 
  This 
  Limestone 
  has 
  been 
  distinctly 
  shown, 
  on 
  

   stratigraphical 
  as 
  well 
  as 
  on 
  palgeontological 
  grounds, 
  to 
  be 
  of 
  

   Inferior 
  Oolite 
  age 
  ; 
  and 
  the 
  Coliyweston 
  Slates, 
  previously 
  classed 
  

   with 
  the 
  Stonesfield 
  beds, 
  are 
  now 
  relegated 
  to 
  their 
  true 
  place 
  

   beneath 
  the 
  Inferior-Oolite 
  or 
  Lincolnshire 
  Limestone. 
  Lithologi- 
  

   cally 
  the 
  two 
  beds 
  are 
  doubtless 
  alike 
  ; 
  but 
  the 
  dissimilar 
  fossil 
  con- 
  

   tents 
  of 
  the 
  two 
  similar 
  beds 
  remove 
  all 
  doubt 
  as 
  to 
  age. 
  Sections 
  

   and 
  well-sustained 
  arguments 
  and 
  views 
  by 
  Mr. 
  Sharp 
  constitute 
  

   the 
  first 
  part 
  of 
  his 
  second 
  paper. 
  The 
  succession 
  established 
  by 
  

   him 
  was 
  as 
  follows 
  : 
  — 
  

  

  1. 
  Great 
  Oolite 
  Limestone. 
  

  

  2. 
  Upper 
  Estuarine 
  series. 
  

  

  3. 
  Lincolnshire 
  Limestone. 
  

  

  4. 
  Lower 
  Estuarine 
  series, 
  "I 
  Northampton 
  

  

  5. 
  Ferruginous 
  beds, 
  J 
  Sand. 
  

   G. 
  Upper 
  Lias 
  Clay. 
  

  

  Everywhere, 
  when 
  exposed, 
  this 
  is 
  the 
  succession. 
  No 
  less 
  than 
  

   twenty 
  carefully 
  prepared 
  lists 
  of 
  fossils 
  accompany 
  Mr. 
  Sharp's 
  

   memoir 
  of 
  1873, 
  each 
  illustrating 
  detailed 
  sections. 
  The 
  presence 
  of 
  

   certain 
  fossils, 
  and 
  also 
  of 
  groups 
  of 
  fossils 
  geographically 
  distributed, 
  

   enables 
  us 
  to 
  correlate 
  the 
  Lower 
  Oolites, 
  under 
  various 
  lithological 
  

   conditions, 
  over 
  extended 
  areas. 
  The 
  fauna 
  of 
  the 
  Lincolnshire 
  

  

  