﻿PROF. 
  C 
  LAPWORTH 
  OIs 
  T 
  THE 
  GIRVA3T 
  SUCCESSION. 
  603 
  

  

  will 
  be 
  shown 
  later 
  on 
  that 
  these 
  outer 
  strata 
  have 
  no 
  connexion 
  

   with 
  the 
  Ardmillan 
  Graptolitic 
  series, 
  but 
  that 
  they 
  consist 
  of 
  mas- 
  

   sive 
  boulder-beds 
  and 
  P^tomcrws-limestones 
  of 
  much 
  later 
  geolo- 
  

   gical 
  age. 
  They 
  are 
  separated 
  from 
  the 
  Barren 
  Flagstones 
  by 
  a 
  

   gigantic 
  strike-fault 
  ranging 
  from 
  Shalloch 
  Forge 
  to 
  "Whitehouse 
  

   Bay. 
  The 
  evidences 
  of 
  this 
  dislocation 
  will 
  be 
  given 
  in 
  the 
  sequel. 
  

  

  In 
  the 
  Stinchar 
  conglomeratic 
  group, 
  and 
  the 
  overlying 
  Graptolitic 
  

   Flagstone 
  series, 
  as 
  developed 
  along 
  the 
  coast-line 
  between 
  Kennedy's 
  

   Pass 
  and 
  Craigskelly, 
  we 
  have 
  therefore 
  at 
  this 
  stage 
  of 
  our 
  inquiry 
  

   recognized 
  the 
  following 
  succession 
  in 
  ascending 
  order 
  : 
  — 
  

  

  (A) 
  Stinchar 
  or 
  Barr 
  Series. 
  

  

  Ac. 
  Benan 
  Conglomerate 
  of 
  Kennedy's 
  Pass. 
  

  

  Ad. 
  Balclatchie 
  beds 
  of 
  Ardmillan 
  Braes, 
  100 
  feet. 
  

  

  (B) 
  Graptolitic 
  Flagstone 
  or 
  Ardmillan 
  Group. 
  

   Ba. 
  Ardwell 
  Beds, 
  at 
  least 
  1000 
  feet. 
  

  

  1'. 
  Thin-bedded 
  shales 
  and 
  mudstones, 
  striped, 
  carbonaceous, 
  

   iron-stained, 
  with 
  Biplograptus 
  rugosus 
  and 
  Climacograptus 
  

   bicornis. 
  

  

  2' 
  . 
  Thicker-bedded 
  shales 
  and 
  flagstones, 
  striped, 
  ironstained, 
  

   with 
  occasional 
  gritty 
  seams 
  — 
  Biplograptus 
  foliaceus 
  and 
  

   Biplograptus 
  pristis, 
  Corynoides 
  calycularis. 
  

   Bb. 
  Whitehouse 
  Beds, 
  300 
  feet. 
  

  

  1. 
  Striped 
  flags 
  and 
  shales 
  with 
  zones 
  of 
  cement-stone 
  — 
  Lcptcena 
  

  

  sericea 
  and 
  Bicellograptus 
  Forchhammeri. 
  

  

  2. 
  Variegated 
  mudstones 
  and 
  calcareous 
  shales, 
  with 
  Bionidc, 
  

  

  Trinucleus. 
  Asaphus, 
  Agnostus, 
  Cyclopyge, 
  Biplograptus 
  

   flaccidus, 
  Pleurograptus 
  linearis, 
  Biplograptus 
  quadiimucro- 
  

   natus. 
  

   Be. 
  Barren 
  Flagstones, 
  500 
  feet. 
  

  

  1. 
  Green 
  shales 
  with 
  occasional 
  zones 
  of 
  flagstones 
  — 
  Nematolites 
  

  

  Grayii. 
  

  

  2. 
  Thick-bedded 
  green 
  flagstones, 
  with 
  partings 
  of 
  dark 
  green 
  

  

  shale. 
  

  

  (c) 
  Description 
  of 
  the 
  Confirmatory 
  Section 
  of 
  the 
  Graptolitic 
  

   Flagstones 
  visible 
  in 
  Penwhapple 
  Glen. 
  

  

  The 
  thick 
  series 
  of 
  Graptolitic 
  and 
  non-fossiliferous 
  shales 
  and 
  

   flagstones 
  which 
  make 
  up 
  the 
  Ardmillan 
  group, 
  attain 
  their 
  greatest 
  

   geographical 
  extension 
  in 
  the 
  Girvan 
  region 
  in 
  the 
  moorland 
  area 
  

   to 
  the 
  east 
  of 
  Byne 
  Hill, 
  where 
  they 
  occupy 
  a 
  continuous 
  tract 
  of 
  

   country 
  from 
  half 
  a 
  mile 
  to 
  one 
  mile 
  and 
  a 
  half 
  in 
  width, 
  which 
  

   stretches 
  inland 
  from 
  the 
  coast-platform 
  of 
  Ardwell 
  and 
  Shalloch 
  

   (last 
  described) 
  to 
  the 
  hills 
  of 
  Knockgerran 
  east 
  of 
  the 
  gorge 
  of 
  

   Penwhapple. 
  

  

  The 
  stream 
  of 
  Penwhapple, 
  after 
  leaving 
  the 
  conglomeratic 
  area 
  

   of 
  ATilljoan 
  and 
  Knockgerran, 
  upon 
  the 
  intractable 
  masses 
  of 
  which 
  

   it 
  spreads 
  out 
  in 
  wide 
  swampy 
  flats, 
  descends 
  suddenly 
  upon 
  the 
  

   softer 
  Graptolitic 
  series 
  at 
  a 
  short 
  distance 
  below 
  the 
  bridge 
  of 
  Bal- 
  

   clatchie. 
  To 
  the 
  north 
  of 
  this 
  point, 
  aided 
  by 
  the 
  more 
  easily 
  dis- 
  

   integrated 
  nature 
  of 
  the 
  strata 
  over 
  which 
  it 
  flows, 
  it 
  has 
  excavated 
  

   a 
  profound 
  gorge, 
  three 
  miles 
  in 
  length, 
  and 
  from 
  50 
  to 
  100 
  feet 
  in 
  

   depth. 
  From 
  end 
  to 
  end 
  of 
  this 
  gorge 
  a 
  continuous 
  and 
  unbroken 
  

   section 
  of 
  the 
  rocky 
  floor 
  of 
  the 
  district 
  is 
  laid 
  open 
  to 
  the 
  inves- 
  

  

  2 
  s2 
  

  

  