﻿598 
  PROF. 
  C. 
  LA.PWORTH" 
  ON 
  THE 
  GIRVAX 
  SUCCESSION". 
  

  

  characteristic 
  division 
  of 
  the 
  Whitehouse 
  beds. 
  It 
  consists 
  of 
  about 
  

   8u 
  feet 
  of 
  brightly 
  coloured 
  mudstones, 
  shales, 
  flags, 
  and 
  calcareous 
  

   beds, 
  remarkable 
  not 
  only 
  for 
  their 
  unique 
  penological 
  features, 
  but 
  

   also 
  for 
  the 
  variety 
  and 
  abundance 
  of 
  their 
  organic 
  remains. 
  

  

  The 
  lowest 
  beds 
  of 
  the 
  division 
  consistof 
  15 
  feet 
  of 
  dark-green 
  mud- 
  

   stones, 
  filled 
  with 
  lines 
  and 
  bands 
  of 
  purple 
  shale. 
  They 
  are 
  suc- 
  

   ceeded 
  at 
  once 
  by 
  a 
  thickness 
  of 
  about 
  30 
  feet 
  of 
  soft 
  mudstones 
  of 
  a 
  

   brilliant 
  purple 
  colour. 
  These 
  are 
  soft 
  and 
  easily 
  disintegrated, 
  and 
  

   have 
  here 
  been 
  worn 
  away 
  by 
  the 
  sea-waves 
  into 
  a 
  deep 
  hollow 
  

   between 
  the 
  underlying 
  and 
  overlying 
  intractable 
  grits 
  and 
  flag- 
  

   stones. 
  They 
  are 
  totally 
  barren 
  of 
  fossils 
  throughout. 
  So 
  far 
  as 
  

   e;ui 
  be 
  made 
  out 
  by 
  piecing 
  together 
  the 
  greatly 
  shattered 
  beds 
  at 
  

   this 
  spot, 
  they 
  pass 
  insensibly 
  upwards 
  into 
  a 
  particoloured 
  zone 
  of 
  

   mudstones, 
  about 
  L5 
  feet 
  thick, 
  purple 
  and 
  green 
  like 
  those 
  at 
  their 
  

   base, 
  and 
  equally 
  barren 
  of 
  organic 
  remains. 
  

  

  Finally 
  we 
  have 
  a 
  zone 
  of 
  2u 
  feet, 
  hard 
  flaggy 
  beds, 
  of 
  which 
  only 
  

   disconnected 
  patches 
  are 
  visible 
  at 
  this 
  locality. 
  These 
  consist 
  of 
  

   flaggy-looking 
  and 
  sandy 
  beds, 
  which 
  stand 
  up 
  on 
  edge 
  amid 
  the 
  sea- 
  

   waves 
  as 
  several 
  prominent 
  bosses, 
  and 
  are 
  only 
  accessible 
  at 
  low 
  

   tide. 
  They 
  are 
  almost 
  wholly 
  composed 
  of 
  platy 
  shales 
  and 
  flagstones, 
  

   more 
  or 
  less 
  calcareous, 
  striped 
  by 
  thin 
  scams 
  of 
  carbonaceous 
  

   matter, 
  and 
  including 
  several 
  highly 
  fossibferous 
  seams 
  crowded 
  with 
  

   fairly 
  preserved 
  Trilobites 
  and 
  (iraptolithina. 
  

  

  The 
  commonest 
  forms 
  I 
  have 
  procured 
  from 
  these 
  beds 
  at 
  this 
  

   locality 
  include 
  : 
  — 
  

  

  Dionide 
  Lapworthi, 
  Eth.jun. 
  i 
  Dicellograptus 
  Morrisi. 
  Hopk. 
  

  

  Cyclopyge 
  rediviva, 
  Burr. 
  

  

  annate, 
  Barr. 
  

  

  Dindymene, 
  sp. 
  

   Agnostus 
  perrugatus, 
  Barr. 
  

   Turrilepas 
  Peacliii, 
  Eth.jun. 
  

  

  — 
  coiuplanatus, 
  Lapw. 
  

   Diplogrnptus 
  socialis, 
  Lapw. 
  

   Ciiniacograptus 
  tubuliferus, 
  Lapw. 
  

   Dio'yonema. 
  

   Ganocladium. 
  

  

  This 
  fossiliferous 
  zone 
  is 
  succeeded 
  immediately 
  by 
  the 
  thick- 
  

   bedded 
  flagstones 
  of 
  the 
  overlying 
  Barren-flagstone 
  group 
  (Be), 
  to 
  be 
  

   noticed 
  later 
  on. 
  Only 
  a 
  few 
  feet, 
  however, 
  of 
  these 
  overlying 
  flag- 
  

   stones 
  are 
  here 
  exposed 
  to 
  view, 
  and 
  their 
  description 
  is 
  best 
  

   deferred 
  until 
  we 
  have 
  completed 
  our 
  study 
  of 
  the 
  distribution 
  of 
  the 
  

   Whitehouse 
  Beds 
  along 
  the 
  coast-section 
  of 
  this 
  neighbourhood. 
  

  

  It 
  will 
  be 
  apparent 
  on 
  a 
  study 
  of 
  the 
  map 
  (No. 
  3, 
  PI. 
  XXV.) 
  that 
  

   these 
  Upper 
  Whitehouse 
  Beds, 
  with 
  their 
  remarkable 
  seams 
  of 
  purple 
  

   shales 
  and 
  ribbed 
  mudstones, 
  can 
  be 
  followed 
  as 
  a 
  continuous 
  band 
  

   running 
  along 
  the 
  general 
  line 
  of 
  the 
  coast 
  from 
  Whitehouse 
  to 
  the 
  

   mouth 
  of 
  the 
  Byne 
  -Hill 
  Burn, 
  for 
  a 
  distance 
  of 
  about 
  a 
  mile. 
  They 
  

   are 
  much 
  interfered 
  with 
  locally 
  by 
  small 
  dislocations 
  ; 
  but 
  the 
  

   continuity 
  of 
  the 
  band 
  is 
  never 
  actually 
  interrupted, 
  throughout 
  

   its 
  entire 
  length. 
  

  

  At 
  the 
  head 
  of 
  Port 
  Cardloch, 
  close 
  to 
  the 
  lodge-gate 
  of 
  Ardmillan 
  

   House, 
  some 
  of 
  these 
  local 
  dislocations 
  are 
  well 
  shown 
  ; 
  and 
  a 
  thin 
  

   set 
  of 
  hard 
  green 
  conglomeratic 
  grits 
  makes 
  its 
  appearance 
  at 
  the 
  

   base 
  of 
  the 
  seiies, 
  forming 
  a 
  conspicuous 
  vertical 
  wall 
  of 
  rock. 
  

  

  After 
  crossing 
  the 
  cultivated 
  angle 
  of 
  Woodland 
  Point, 
  we 
  again 
  

  

  

  