﻿664 
  PROF. 
  C. 
  LAPWORTH 
  ON 
  THE 
  GIRVAN 
  SUCCESSION. 
  

  

  The 
  geographical 
  distribution 
  of 
  the 
  various 
  members 
  of 
  the 
  Girvan 
  

   succession 
  within 
  the 
  region 
  we 
  have 
  described 
  is 
  given 
  in 
  the 
  

   accompanying 
  Maps 
  and 
  Plates, 
  &c. 
  

  

  The 
  detailed 
  description 
  of 
  the 
  physical 
  structure 
  of 
  the 
  region, 
  and 
  

   of 
  the 
  lithology 
  and 
  palaeontology 
  of 
  the 
  several 
  members 
  of 
  the 
  

   Girvan 
  succession, 
  together 
  with 
  the 
  discussion 
  of 
  their 
  resemblances, 
  

   physical 
  and 
  zoological, 
  to 
  their 
  extra- 
  Girvan 
  equivalents, 
  are 
  points 
  

   deferred 
  to 
  the 
  second 
  part 
  of 
  this 
  memoir. 
  

  

  EXPLANATION 
  OF 
  THE 
  PLATES. 
  

  

  Plate 
  XXIY. 
  

   General 
  Map 
  of 
  the 
  Girvan 
  District. 
  

  

  Plate 
  XXV. 
  

   Maps 
  of 
  the 
  more 
  important 
  subareas 
  of 
  the 
  Girvan 
  District. 
  

  

  Map 
  1. 
  The 
  Saugh-Hill 
  and 
  Penwhapple 
  district. 
  

  

  2. 
  The 
  Stinchar 
  and 
  Benan-Hill 
  district. 
  

  

  3. 
  The 
  coast-line 
  from 
  Ardwell 
  to 
  Shalloch 
  Forge. 
  

  

  4. 
  The 
  Quarrel-Hill 
  and 
  Newlancls 
  district. 
  

  

  Discussion. 
  

  

  Dr. 
  Davidson 
  said 
  that 
  though 
  he 
  had 
  not 
  visited 
  the 
  locality, 
  

   Mrs. 
  Gray's 
  fine 
  collection 
  of 
  Girvan 
  fossils 
  had 
  lately 
  passed 
  through 
  

   his 
  hands, 
  and 
  Prof. 
  Lapworth 
  had 
  supplied 
  him 
  with 
  his 
  classi- 
  

   fication 
  of 
  the 
  rocks. 
  He 
  had 
  examined 
  the 
  fossils 
  carefully, 
  and 
  

   compared 
  them 
  with 
  the 
  table 
  of 
  strata 
  made 
  from 
  Prof. 
  Lapworth's 
  

   notes, 
  and 
  found 
  them 
  to 
  coincide 
  in 
  every 
  particular. 
  

  

  After 
  about 
  four 
  months 
  of 
  assiduous 
  research 
  he 
  was 
  able 
  to 
  

   recognize, 
  from 
  the 
  Llandovery, 
  Caradoc, 
  and 
  Upper 
  Llandeilo 
  of 
  

   that 
  district, 
  some 
  115 
  species, 
  an 
  enormous 
  number 
  from 
  so 
  re- 
  

   stricted 
  a 
  locality. 
  Some 
  of 
  the 
  forms 
  are 
  quite 
  new, 
  and 
  have 
  not 
  

   been 
  hitherto 
  discovered 
  either 
  in 
  England 
  or 
  in 
  Ireland. 
  

  

  It 
  was 
  astonishing 
  to 
  find 
  so 
  very 
  large 
  a 
  number 
  of 
  species 
  in 
  

   rocks 
  attributed 
  to 
  the 
  Upper 
  Llandeilo 
  in 
  Scotland 
  ; 
  for 
  whilst 
  in 
  

   England 
  and 
  in 
  Ireland 
  the 
  total 
  number 
  of 
  recorded 
  species 
  of 
  

   Brachiopoda 
  from 
  the 
  whole 
  of 
  the 
  Llandeilo 
  would 
  not 
  exceed 
  

   some 
  28, 
  the 
  Upper 
  Llandeilo 
  of 
  Ayrshire 
  alone 
  has 
  furnished 
  us 
  

   with 
  nearly 
  60. 
  Of 
  this 
  number 
  about 
  18 
  would 
  be 
  common 
  to 
  the 
  

   Llandeilo 
  of 
  England 
  (including 
  Ireland) 
  and 
  Girvan 
  ; 
  so 
  that, 
  

   with 
  the 
  exception 
  of 
  about 
  10 
  species, 
  all 
  the 
  others 
  would 
  be, 
  in 
  

   the 
  present 
  state 
  of 
  our 
  knowledge, 
  peculiar 
  to 
  Scotland, 
  Of 
  course 
  

   these 
  numbers 
  are 
  provisional, 
  as 
  Dr. 
  Davidson 
  had 
  not 
  finally 
  

   completed 
  his 
  investigations, 
  but 
  the 
  general 
  results 
  will 
  not 
  be 
  

   materially 
  modified. 
  On 
  the 
  other 
  hand, 
  whilst 
  some 
  75 
  species 
  

   have 
  been 
  recorded 
  from 
  the 
  Caradoc 
  of 
  England 
  and 
  Ireland, 
  only 
  

   about 
  28 
  have 
  been 
  collected 
  from 
  the 
  Middle 
  and 
  Upper 
  Caradoc 
  of 
  

   Girvan. 
  Nearly 
  all 
  the 
  Caradoc 
  species 
  found 
  in 
  Ayrshire 
  occur 
  

  

  