﻿PROF. 
  C. 
  LAPWORXH 
  OX 
  THE 
  GTRVAX 
  SUCCESSION. 
  637 
  

  

  slopes 
  of 
  its 
  prominent 
  ridge 
  until 
  we 
  reach 
  the 
  north 
  and 
  south 
  

   fence 
  which 
  separates 
  the 
  properties 
  of 
  Killochan 
  and 
  Bargany. 
  A 
  

   little 
  to 
  the 
  west 
  of 
  this 
  fence 
  the 
  M.-Sedgwickii 
  beds 
  are 
  seen 
  in 
  sita, 
  

   retaining 
  all 
  the 
  characteristics 
  they 
  exhibited 
  in 
  Penwhapple 
  glen, 
  

   and 
  affording 
  : 
  — 
  

  

  Rastrites 
  hybridus, 
  Lapw. 
  

   Monograptus 
  Sedgwiekii, 
  Portl. 
  

   ■ 
  — 
  — 
  spiralis, 
  Gein. 
  

   lobiferus, 
  M'Coy. 
  

  

  Diplograptus 
  palmeus, 
  Barr. 
  

  

  tamariscus, 
  Kick. 
  

  

  Climacograptus 
  normalis, 
  Lapw. 
  

  

  The 
  northern 
  slopes 
  of 
  Saugh 
  Hill 
  are 
  occupied 
  by 
  grey 
  shales 
  

   and 
  nags 
  probably 
  a 
  little 
  lower 
  in 
  the 
  series. 
  These 
  are 
  well 
  ex- 
  

   posed 
  in 
  many 
  sections 
  on 
  the 
  hill-face, 
  very 
  conspicuous 
  from 
  the 
  

   valley 
  below. 
  They 
  contain 
  few 
  fossils, 
  the 
  chief 
  forms 
  I 
  have 
  

   been 
  able 
  to 
  procure 
  from 
  them 
  being 
  Monograptus 
  gregarius, 
  Lapw., 
  

   and 
  liastrites 
  peregrinus, 
  Barr. 
  

  

  (c) 
  Coast-area 
  of 
  Shalloch 
  and 
  Woodland. 
  

  

  The 
  broad 
  band 
  of 
  yellow 
  gritstone 
  and 
  grey 
  Graptolitiferous 
  

   shales 
  we 
  have 
  traced 
  from 
  the 
  gorge 
  of 
  Penwhapple 
  into 
  the 
  

   heights 
  overlooking 
  the 
  seaport 
  of 
  Girvan 
  is 
  abruptly 
  truncated, 
  

   where 
  it 
  attains 
  its 
  widest 
  geographical 
  extension 
  at 
  the 
  western 
  

   extremity 
  of 
  Saugh 
  Hill, 
  by 
  the 
  transverse 
  fault 
  of 
  Saugh-Hill 
  Burn. 
  

   The 
  area 
  through 
  which 
  its 
  strata 
  would 
  naturally 
  be 
  prolonged 
  

   is 
  occupied 
  by 
  the 
  older 
  and 
  very 
  distinct 
  Ardmillan 
  Shales, 
  which 
  

   strike 
  almost 
  at 
  right 
  angles 
  to 
  the 
  Saugh-Hill 
  band. 
  These 
  

   Ardmillan 
  strata, 
  after 
  gaining 
  their 
  normal 
  strike 
  in 
  Piedmont 
  

   Glen, 
  are 
  continued 
  to 
  the 
  west 
  in 
  the 
  coast-platform 
  of 
  Shalloch 
  and 
  

   Ardwell 
  as 
  far 
  as 
  the 
  distant 
  headland 
  of 
  Woodland 
  and 
  Kennedy's 
  

   Pass, 
  between 
  which, 
  as 
  we 
  have 
  shown, 
  they 
  attain 
  their 
  most 
  

   typical 
  development 
  in 
  the 
  Girvan 
  region. 
  

  

  The 
  great 
  fault 
  of 
  Braehill 
  and 
  Dailly, 
  which 
  forms 
  the 
  southern 
  

   boundary 
  of 
  the 
  Carboniferous 
  and 
  Old 
  Red 
  beds 
  of 
  the 
  Girvan 
  

   valley, 
  and 
  which 
  crosses 
  the 
  front 
  of 
  Saugh 
  Hill 
  at 
  the 
  head 
  of 
  

   Cuddystone 
  Burn, 
  comes 
  upon 
  the 
  shore 
  at 
  Shalloch 
  Forge 
  and 
  is 
  

   prolonged 
  south-westwards 
  down 
  the 
  entire 
  length 
  of 
  the 
  coast- 
  

   platform. 
  It 
  runs 
  in 
  a 
  straight 
  line 
  parallel 
  with 
  the 
  edge 
  of 
  

   the 
  shore, 
  and 
  throws 
  down 
  against 
  the 
  flaggy 
  Ardmillan 
  series 
  

   a 
  very 
  different 
  set 
  of 
  beds 
  of 
  a 
  most 
  peculiar 
  petrological 
  cha- 
  

   racter. 
  They 
  consist 
  of 
  massive 
  boulder-conglomerates, 
  pebbly 
  grits, 
  

   and 
  striped 
  shales. 
  The 
  hard 
  and 
  intractable 
  nature 
  of 
  these 
  

   peculiar 
  strata, 
  as 
  contrasted 
  with 
  the 
  more 
  easily 
  eroded 
  Ardmillan 
  

   beds 
  with 
  which 
  they 
  are 
  in 
  contact, 
  has 
  resulted 
  in 
  their 
  being 
  

   preserved 
  as 
  a 
  line 
  of 
  conspicuous 
  reefs, 
  which 
  rise 
  up 
  boldly 
  out 
  of 
  

   deep 
  water, 
  and 
  form 
  a 
  protecting 
  fringe 
  along 
  the 
  seaward 
  edge 
  of 
  

   the 
  platform. 
  At 
  high 
  water 
  they 
  compose 
  a 
  line 
  of 
  long 
  and 
  

   narrow 
  islands, 
  against 
  which 
  the 
  waves 
  dash 
  their 
  fiercest, 
  while 
  

   the 
  interior 
  parts 
  of 
  the 
  platform, 
  occupied 
  by 
  the 
  Ardmillan 
  series, 
  

   are 
  covered 
  from 
  sight 
  by 
  the 
  less 
  agitated 
  waters 
  which 
  force 
  their 
  

   way 
  through 
  the 
  many 
  openings 
  in 
  this 
  natural 
  breakwater. 
  

  

  