﻿IOO 
  PKOCEEDINGS 
  OP 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  centre. 
  As 
  a 
  consequence 
  of 
  this 
  local 
  depression 
  there 
  was 
  slowly 
  

   accumulated 
  by 
  the 
  growth 
  of 
  coral 
  reefs, 
  and 
  the 
  action 
  of 
  marine 
  

   currents 
  sweeping 
  small 
  shells 
  and 
  their 
  fragments 
  along 
  the 
  sea- 
  

   bottom, 
  a 
  mass 
  of 
  calcareous 
  strata, 
  presenting 
  many 
  variations 
  in 
  

   its 
  local 
  characters, 
  and 
  constituting 
  the 
  formation 
  to 
  which 
  we 
  have 
  

   applied 
  the 
  name 
  of 
  the 
  Lincolnshire 
  Oolite 
  Limestone." 
  Again, 
  wher- 
  

   ever 
  the 
  junction 
  of 
  the 
  Upper 
  and 
  Lower 
  Estuarine 
  series 
  can 
  be 
  

   examined 
  there 
  is 
  proof 
  of 
  unconformity 
  ; 
  and 
  the 
  thick 
  series 
  of 
  beds 
  

   of 
  the 
  Lincolnshire 
  Oolite 
  is 
  wedged 
  in 
  between 
  them 
  in 
  a 
  lenticular 
  

   manner 
  ; 
  the 
  zone 
  of 
  Am. 
  Murchisonce 
  holding 
  the 
  ferruginous 
  

   Northampton 
  Sands 
  (certainly 
  at 
  the 
  base), 
  the 
  upper 
  members 
  

   possibly 
  represent 
  that 
  of 
  Am. 
  Sowerbyi. 
  Clearly 
  this 
  demonstrates 
  

   that 
  a 
  great 
  unconformity 
  exists 
  in 
  the 
  Midland 
  area 
  between 
  the 
  

   true 
  Great 
  Oolite 
  series 
  and 
  the 
  known 
  top 
  of 
  the 
  Lincolnshire 
  

   Limestone. 
  Those 
  beds 
  in 
  the 
  Cotteswold 
  of 
  Gloucestershire 
  &c. 
  

   containiug 
  Ammonites 
  Parlinsoni 
  and 
  Am. 
  Hump7iriesiamis, 
  or 
  the 
  

   Fuller's 
  Earth, 
  the 
  Ragstones, 
  and 
  Upper 
  Freestones 
  of 
  the 
  Inferior 
  

   Oolite 
  of 
  that 
  region, 
  are 
  entirely 
  wanting 
  in 
  Northamptonshire 
  and 
  

   Lincolnshire. 
  This 
  paucity 
  of 
  fossils 
  belonging 
  to 
  those 
  two 
  zones 
  

   is 
  detected 
  on 
  examining 
  the 
  well-prepared 
  lists 
  of 
  fossils 
  by 
  Mr* 
  

   Sharp 
  and 
  Prof. 
  Judd, 
  and 
  bears 
  out 
  the 
  history 
  of 
  the 
  deposits. 
  No 
  

   group 
  more 
  strikingly 
  or 
  certainly 
  determines 
  this 
  than 
  the 
  Ammo- 
  

   nites. 
  Table 
  XII. 
  shows 
  that 
  a 
  number 
  of 
  species 
  are 
  common 
  

   to 
  the 
  Lincolnshire 
  Oolite 
  and 
  the 
  Great 
  Oolite 
  (133 
  out 
  of 
  306), 
  

   a 
  greater 
  number 
  by 
  far 
  (40 
  species) 
  than 
  in 
  the 
  Lincolnshire 
  and 
  

   Yorkshire 
  beds 
  of 
  the 
  same 
  age. 
  This 
  may 
  be 
  accounted 
  for 
  by 
  

   the 
  remarkable 
  way 
  in 
  which 
  the 
  Lower 
  Oolites 
  of 
  Yorkshire 
  were 
  

   deposited. 
  On 
  the 
  other 
  hand 
  the 
  relation 
  of 
  the 
  Inferior 
  Oolite 
  

   of 
  the 
  south 
  of 
  England 
  to 
  the 
  Lincolnshire 
  Limestone 
  is 
  as 
  216 
  

   to 
  306, 
  a 
  very 
  large 
  number 
  if 
  we 
  take 
  into 
  consideration 
  the 
  con- 
  

   ditions 
  of 
  deposition 
  and 
  the 
  extended 
  development 
  of 
  the 
  Southern 
  

   Oolites. 
  To 
  make 
  the 
  Tables 
  of 
  greater 
  value, 
  I 
  append 
  another 
  

   (XIII.) 
  with 
  the 
  number 
  of 
  genera 
  added 
  ; 
  it 
  will 
  also 
  keep 
  up 
  the 
  

   uniformity 
  of 
  the 
  series 
  for 
  reference. 
  

  

  