﻿66 
  

  

  PROCEEDINGS 
  OP 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  A. 
  Blagdeni, 
  and 
  an 
  undescribed 
  form 
  from 
  Duston. 
  Nautilus 
  is 
  

   represented 
  by 
  two 
  species 
  only, 
  N. 
  obesus 
  and 
  JV. 
  polygonalis 
  : 
  the 
  

   Crustacea 
  by 
  only 
  two 
  species 
  ; 
  the 
  Asteriodea 
  only 
  by 
  Astro 
  - 
  

   pecten 
  cottswoldice, 
  var. 
  stamfordensis. 
  On 
  the 
  other 
  hand, 
  the 
  Mol- 
  

   lusca 
  proper, 
  in 
  all 
  three 
  groups, 
  show 
  a 
  large 
  fauna 
  ; 
  the 
  species 
  of 
  

   Gasteropoda 
  obtained 
  from 
  the 
  Barnack 
  Rag, 
  number 
  66, 
  and 
  illus- 
  

   trate 
  17 
  genera 
  ; 
  from 
  the 
  well-known 
  cutting 
  at 
  Ponton, 
  20 
  genera 
  

   and 
  64 
  species 
  are 
  recorded. 
  The 
  Gasteropoda 
  through 
  the 
  ten 
  

   localities 
  number 
  75 
  genera 
  and 
  218 
  species 
  ; 
  the 
  Lamellibran- 
  

   chiata 
  Monomyaria 
  63 
  genera 
  and 
  136 
  species 
  ; 
  the 
  Dimyaria 
  

   112 
  genera 
  and 
  211 
  species. 
  The 
  Brachiopoda 
  have 
  little 
  specific 
  

   value 
  ; 
  in 
  no 
  instance 
  have 
  more 
  than 
  8 
  species 
  occurred 
  in 
  one 
  

   locality. 
  The 
  Echinoidea 
  and 
  the 
  Ccelenterata 
  (Corals) 
  are 
  equally 
  

   balanced. 
  The 
  remaining 
  classes 
  have 
  no 
  value 
  numerically. 
  The 
  

   Collyweston 
  species 
  and 
  those 
  of 
  the 
  Lower 
  Estuarine 
  beds 
  still 
  re- 
  

   quire 
  critical 
  attention, 
  as 
  also 
  the 
  conditions 
  of 
  their 
  deposition. 
  

   The 
  slates 
  of 
  Collyweston 
  succeed 
  the 
  Lower 
  Estuarine 
  group 
  ; 
  the 
  

   twelve 
  or 
  fourteen 
  recognized 
  beds 
  hold 
  well-defined 
  species, 
  amongst 
  

   them 
  being 
  Natica 
  cincta 
  (J¥. 
  leclchamptonensis), 
  Unicardium 
  im- 
  

   pression, 
  Cardium 
  Bachnani, 
  the 
  highly 
  characteristic 
  Pterocera 
  

   Bentleyi, 
  Trigonia 
  compta, 
  Homomya 
  unioniformis, 
  Astropecten 
  

   cottswoldice, 
  var. 
  stamfordensis. 
  Pecopteris 
  polypodioides, 
  with 
  its 
  

   fronds 
  in 
  fructification, 
  is 
  abundant 
  in 
  the 
  uppermost 
  beds. 
  The 
  

   fauna 
  of 
  this 
  deposit 
  differs 
  essentially 
  from 
  that 
  of 
  the 
  Stonesfield 
  

   Slate, 
  with 
  which 
  it 
  was 
  for 
  years 
  confounded. 
  Neither 
  the 
  plants, 
  

   the 
  I'rigonice, 
  nor 
  the 
  Pterocera 
  &c. 
  are 
  to 
  be 
  confounded 
  with 
  the 
  

   slates 
  that 
  underlie 
  the 
  Great 
  Oolite 
  of 
  the 
  Cotteswold 
  and 
  Oxford- 
  

   shire, 
  which 
  contain 
  remains 
  of 
  marsupials 
  in 
  addition 
  to 
  a 
  large 
  in- 
  

   vertebrate 
  fauna. 
  All 
  the 
  localities 
  named 
  in 
  the 
  table 
  prepared, 
  and 
  

   many 
  others, 
  are 
  detailed 
  by 
  Mr. 
  Sharp 
  in 
  his 
  paper. 
  Equally 
  im- 
  

   portant 
  and 
  critical 
  work 
  was 
  done 
  in 
  1870 
  throughout 
  Northamp- 
  

   tonshire 
  in 
  the 
  Great 
  Oolite, 
  Upper 
  Estuarine, 
  and 
  higher 
  members 
  

   of 
  the 
  Lower 
  Oolite. 
  The 
  valuable 
  tables 
  of 
  the 
  distribution 
  of 
  the 
  

   Great 
  Oolite 
  fossils 
  on 
  pp. 
  382-385 
  of 
  the 
  ' 
  Quart. 
  Journ. 
  Geol. 
  Soc' 
  

   for 
  1870, 
  embracing 
  the 
  three 
  chief 
  localities 
  within 
  the 
  Northamp- 
  

   tonshire 
  area, 
  I 
  have, 
  with 
  the 
  addition 
  of 
  three 
  other 
  localities 
  

   (Essendine, 
  Belmesthorpe, 
  and 
  Stilton), 
  readjusted 
  into 
  a 
  generic 
  and 
  

   specific 
  analysis 
  (Table 
  II.), 
  which 
  shows 
  the 
  number 
  of 
  both 
  genera 
  

   and 
  species 
  in 
  each 
  of 
  the 
  six 
  localities 
  ; 
  thus 
  the 
  Great 
  Oolite 
  of 
  

   Kingsthorpe, 
  Duston, 
  Blisworth, 
  Essendine, 
  Belmesthorpe, 
  and 
  Stil- 
  

   ton 
  is 
  summarized, 
  the 
  fauna 
  of 
  each 
  locality 
  being 
  given. 
  Their 
  

   numerical 
  values 
  are 
  as 
  follows, 
  expressed 
  in 
  the 
  same 
  formula 
  as 
  in 
  

  

  the 
  table 
  : 
  — 
  Kingsthorpe 
  & 
  8 
  Duston 
  |§ 
  Blisworth 
  

   dine 
  «J§ 
  Belmesthorpe 
  \ 
  f 
  and 
  Stilton 
  |jj. 
  

  

  48 
  

   111, 
  

  

  Essen- 
  

  

  