﻿642 
  PEOE. 
  C. 
  LAPWOETH 
  ON 
  THE 
  63 
  EVAN 
  SUCCESSION. 
  

  

  of 
  folding 
  and 
  dislocation. 
  The 
  inner 
  edges 
  of 
  the 
  reef 
  are 
  formed 
  

   by 
  coarser 
  beds 
  («), 
  which 
  are 
  filled 
  with 
  abundant 
  fragments 
  of 
  

   quartz, 
  gritstone, 
  and 
  igneous 
  rocks, 
  and 
  deserve 
  rather 
  the 
  title 
  of 
  

   coarse 
  pebbly 
  conglomerates. 
  

  

  Between 
  these 
  conglomerates 
  and 
  the 
  beds 
  next 
  to 
  be 
  described, 
  

   the 
  phenomena 
  visible 
  upon 
  the 
  ground 
  give 
  rise 
  to 
  the 
  suspicion 
  

   that 
  a 
  fault 
  is 
  present 
  ; 
  but 
  of 
  its 
  magnitude 
  and 
  effect 
  in 
  interrupt- 
  

   ing 
  the 
  natural 
  sequence 
  no 
  evidence 
  is- 
  forthcoming. 
  

  

  The 
  low 
  and 
  partly 
  sand-covered 
  area 
  lying 
  between 
  these 
  

   conglomerates 
  and 
  the 
  great 
  Braehill 
  fault, 
  which 
  brings 
  up 
  the 
  

   Barren 
  Flagstones 
  of 
  the 
  much 
  older 
  Ardmillan 
  series, 
  is 
  occupied 
  by 
  

   a 
  series 
  of 
  calcareous 
  strata 
  most 
  prolific 
  in 
  fossils. 
  These 
  are 
  

   exposed 
  in 
  some 
  insignificant 
  bosses 
  of 
  rock 
  that 
  are 
  accessible 
  only 
  

   at 
  low 
  water, 
  and 
  in 
  occasional 
  patches 
  of 
  strata 
  which 
  project 
  here 
  

   and 
  there 
  through 
  the 
  floor 
  of 
  the 
  sandy 
  beach. 
  

  

  Next 
  to 
  the 
  intermittent 
  conglomeratic 
  bands 
  last 
  noticed 
  follow 
  

   certain 
  green 
  flaggy 
  shales 
  (y), 
  striped 
  with 
  lines 
  of 
  carbon 
  and 
  seams 
  

   of 
  calcareous 
  matter. 
  Only 
  a 
  few 
  feet 
  of 
  these 
  beds 
  are 
  exposed, 
  

   but 
  they 
  are 
  most 
  prolific 
  in 
  beautifully 
  preserved 
  Graptolites, 
  es- 
  

   pecially 
  Diplograptus 
  modestus, 
  Lapw., 
  Climacograptus 
  normalis, 
  

   Lapw., 
  Monograptus 
  tenuis, 
  Portl., 
  M. 
  gregarius, 
  Lapw., 
  M. 
  lepto- 
  

   theca, 
  Lapw., 
  together 
  with 
  fairly 
  preserved 
  Brachiopoda 
  and 
  forms 
  

   of 
  Orthoceras. 
  

  

  These 
  beds 
  are 
  followed 
  to 
  the 
  south-east 
  by 
  soft 
  green 
  shales, 
  

   highly 
  calcareous, 
  and 
  abounding 
  with 
  most 
  exquisitely 
  preserved 
  

   examples 
  of 
  Strophomena 
  grandis, 
  Atrypa 
  reticularis, 
  A. 
  imbricata, 
  

   Orthis 
  elegantida, 
  and 
  Leptcena 
  quinquecostata. 
  

  

  They 
  are 
  succeeded 
  by 
  a 
  thickness 
  of 
  about 
  30 
  feet 
  of 
  highly 
  

   calcareous 
  flagstones 
  or 
  limestones 
  (/3), 
  which 
  form 
  prominent 
  ridges 
  

   on 
  both 
  sides 
  of 
  the 
  peninsula. 
  These 
  limestone 
  flags 
  are 
  arranged 
  in 
  

   beds 
  which 
  vary 
  from 
  a 
  foot 
  to 
  an 
  inch 
  in 
  thickness, 
  and 
  are 
  almost 
  

   made 
  up 
  of 
  organic 
  remains. 
  Some 
  of 
  the 
  beds 
  are 
  a 
  compacted 
  

   mass 
  of 
  Stricldandinia 
  lens 
  : 
  others 
  are 
  crowded 
  with 
  Strophomena 
  

   grandis 
  ; 
  but 
  all 
  are 
  indeed 
  most 
  astonishingly 
  prolific. 
  Here 
  I 
  have 
  

   collected 
  Stricldandinia 
  lens, 
  Pentamerus 
  oblongus, 
  Africa 
  reticularis, 
  

   A. 
  imbricata, 
  Bronteus, 
  Encrinurus 
  punctatus, 
  Holopella, 
  and 
  a 
  host 
  

   of 
  Corals, 
  Encrinites, 
  and 
  Orthocerata. 
  

  

  About 
  30 
  or 
  40 
  feet 
  of 
  these 
  Pentamerus 
  -limestones 
  are 
  here 
  ex- 
  

   posed, 
  dipping 
  at 
  an 
  apparent 
  angle 
  of 
  about 
  60° 
  to 
  the 
  south-west, 
  

   that 
  is 
  to 
  say 
  into 
  the 
  line 
  of 
  the 
  great 
  longitudinal 
  fault 
  which 
  

   here 
  intervenes 
  to 
  separate 
  them 
  from 
  the 
  ancient 
  barren 
  flagstones 
  

   of 
  the 
  Ardmillan 
  series. 
  

  

  That 
  these 
  Pentameyus-limcstoTies, 
  Graptolitic 
  shales, 
  and 
  massive 
  

   gritstones 
  belong 
  to 
  the 
  same 
  special 
  group 
  as 
  the 
  rocks 
  forming 
  the 
  

   more 
  easterly 
  portions 
  of 
  this 
  rock-reef 
  as 
  exposed 
  in 
  Craigskelly 
  

   and 
  its 
  neighbourhood 
  is 
  absolutely 
  certain. 
  The 
  rocks 
  of 
  this 
  reef 
  

   have 
  a 
  special 
  character 
  of 
  their 
  own, 
  easily 
  recognizable 
  upon 
  the 
  

   ground, 
  which 
  distinguishes 
  them 
  at 
  sight 
  from 
  the 
  flaggy 
  Ardmillan 
  

   strata 
  with 
  which 
  they 
  are 
  in 
  unnatural 
  contact, 
  while 
  the 
  fossils 
  

   are 
  the 
  same 
  along 
  the 
  entire 
  extent 
  of 
  the 
  reef. 
  

  

  