﻿PROP. 
  C. 
  LAPWORTH 
  ON" 
  THE 
  GIRVAN 
  SUCCESSION". 
  bZ9 
  

  

  from 
  the 
  Barren 
  Flagstones 
  of 
  Quarrel 
  Hill 
  into 
  the 
  Graptolitic 
  flag- 
  

   stones 
  and 
  shales 
  of 
  Glenshalloch. 
  The 
  strata 
  of 
  the 
  inlier 
  belong 
  to 
  

   two 
  distinct 
  groups 
  in 
  the 
  succession, 
  each 
  group 
  being 
  strikingly 
  

   individualized 
  by 
  lithological 
  characters 
  and 
  by 
  peculiar 
  organic 
  

   remains. 
  The 
  strata 
  of 
  all 
  except 
  the 
  highest 
  formation 
  of 
  this 
  

   sequence 
  are 
  exposed 
  in 
  unbroken 
  succession 
  ; 
  while 
  there 
  is 
  suffi- 
  

   cient 
  evidence 
  available 
  to 
  fix 
  the 
  true 
  place 
  of 
  this 
  final 
  division, 
  

   and 
  to 
  determine 
  broadly 
  the 
  thickness 
  and 
  general 
  characters 
  and 
  

   fossils 
  of 
  its 
  natural 
  members. 
  We 
  have, 
  that 
  is 
  to 
  say, 
  in 
  this 
  

   northern 
  inlier 
  the 
  following 
  ascending 
  sequence 
  : 
  — 
  

  

  a 
  f 
  Be. 
  Barren 
  Flagstones 
  of 
  Balweary 
  and 
  Quarrel 
  Hill. 
  

   £ 
  ri 
  | 
  B 
  d. 
  Trinucleus 
  Shales 
  of 
  Drunimuck 
  and 
  Lady 
  Burn, 
  consisting 
  of: 
  — 
  

   "g 
  -2 
  ^ 
  1. 
  The 
  fossiliferous 
  basal 
  grits 
  of 
  Auldthorns. 
  

  

  ■^ 
  oM 
  2. 
  The 
  Trinucleus-M.xisdtones 
  of 
  Lady 
  Burn. 
  

  

  <| 
  { 
  3. 
  The 
  Sandstones 
  and 
  Starfish-beds 
  of 
  Quarrel 
  Hill. 
  

  

  ('Ca. 
  The 
  Mulloch-Hill 
  Beds, 
  consisting 
  of 
  : 
  — 
  

  

  1. 
  The 
  Mulloch-Hill 
  (High 
  Mains) 
  Conglomerate. 
  

   rg 
  . 
  J 
  2. 
  The 
  Bough-Neuk 
  Shelly 
  Sandstones. 
  

  

  j 
  . 
  | 
  J 
  3. 
  The 
  Graptolitic 
  Mudstones 
  of 
  Glenwells 
  Burn. 
  

  

  *% 
  © 
  j 
  C 
  b. 
  The 
  Newlands 
  Beds, 
  containing 
  : 
  - 
  

   ^ 
  m 
  \ 
  1. 
  The 
  Pentamern 
  s-gvits 
  and 
  Yellow 
  Flags 
  of 
  Newlands. 
  

  

  2. 
  The 
  Graptolitic 
  (gregarius) 
  Shales 
  of 
  Baldrennan 
  and 
  Glen- 
  

   ^ 
  shalloch 
  Wood. 
  

  

  (D) 
  Strata 
  between 
  the 
  Saugh-Hill 
  Fault 
  and 
  the 
  Camreoan 
  

   Limestone. 
  

  

  With 
  the 
  invaluable 
  aid 
  afforded 
  us 
  by 
  the 
  complete 
  and 
  highly 
  

   satisfactory 
  succession 
  among 
  the 
  T?*inucleus~, 
  BracMopod-, 
  and 
  

   Pentamerus-giou^s 
  we 
  have 
  last 
  determined 
  in 
  the 
  Craighead 
  area, 
  

   we 
  now 
  return 
  to 
  the 
  rocks 
  of 
  the 
  main 
  plateau, 
  and 
  resume 
  our 
  

   study 
  of 
  the 
  Lower 
  Palaeozoic 
  strata 
  lying 
  to 
  the 
  south 
  of 
  the 
  Girvan 
  

   Valley. 
  

  

  The 
  strata 
  of 
  this 
  important 
  region 
  which 
  yet 
  remain 
  to 
  be 
  

   described, 
  lie 
  between 
  the 
  Saugh-Hill 
  fault 
  and 
  the 
  bounding 
  dislo- 
  

   cation 
  of 
  Bargany, 
  which 
  has 
  depressed 
  the 
  Carboniferous 
  and 
  Old 
  

   Eed 
  Sandstone 
  rocks 
  of 
  the 
  valley 
  of 
  the 
  Girvan. 
  The 
  area 
  thev 
  

   occupy 
  extends 
  inland 
  from 
  the 
  sea-shore 
  near 
  Shalloch 
  to 
  the 
  

   village 
  of 
  Straiton 
  upon 
  the 
  upper 
  course 
  of 
  the 
  Girvan 
  Water, 
  a 
  

   distance 
  of 
  12 
  miles 
  ; 
  but 
  its 
  greatest 
  breadth 
  rarely 
  exceeds 
  three 
  

   fourths 
  of 
  a 
  mile. 
  Within 
  the 
  area 
  thus 
  defined, 
  the 
  rocks 
  under 
  

   notice, 
  as 
  will 
  be 
  apparent 
  upon 
  a 
  study 
  of 
  the 
  maps, 
  are 
  arranged 
  

   in 
  a 
  series 
  of 
  well-marked 
  petrological 
  zones, 
  which 
  form 
  a 
  suc- 
  

   cession 
  of 
  very 
  narrow 
  parallel 
  bands, 
  ranging 
  longitudinally 
  

   through 
  the 
  area 
  from 
  the 
  Braehill 
  fault 
  on 
  the 
  west 
  across 
  the 
  

   gorge 
  of 
  Penwhapple, 
  and 
  thence 
  into 
  the 
  steep 
  slopes 
  of 
  Bargany 
  

   and 
  Dailly, 
  till 
  they 
  finally 
  plunge, 
  one 
  by 
  one, 
  below 
  the 
  gently 
  

   inclined 
  conglomerates, 
  red 
  sandstones, 
  and 
  traps 
  which 
  make 
  up 
  

   the 
  Old 
  Red 
  Sandstone 
  group 
  of 
  the 
  Hadyard 
  Hills. 
  

  

  At 
  first 
  glance 
  it 
  would 
  seem 
  that 
  nothing 
  could 
  be 
  more 
  simple 
  

   than 
  this 
  arrangement. 
  Hock-bands 
  so 
  distinctive 
  in 
  individual 
  

   peculiarities, 
  and 
  so 
  symmetrically 
  disposed, 
  are 
  naturally 
  expected 
  

  

  