﻿PRCP. 
  C. 
  LAPWORTH 
  ON 
  THE 
  GIRVAN 
  SUCCESSION. 
  589 
  

  

  gritstones, 
  which 
  pass 
  upwards 
  into 
  the 
  basal 
  beds 
  of 
  the 
  Graptolitic 
  

   flagstones 
  that 
  fill 
  the 
  extended 
  area 
  to 
  the 
  north. 
  

  

  A 
  short 
  distance 
  to 
  the 
  south-west 
  we 
  find 
  a 
  magnificent 
  exposure 
  

   of 
  these 
  conglomeratic 
  grits 
  near 
  the 
  lime-quarries 
  of 
  Tramitchell. 
  

   The 
  extended 
  area 
  of 
  Graptolitic 
  flagstone 
  is 
  there 
  bounded 
  to 
  the 
  

   southward 
  by 
  a 
  band 
  of 
  coarse 
  pebbly 
  grit, 
  about 
  50 
  feet 
  in 
  thickness, 
  

   which 
  extends 
  in 
  an 
  unbroken 
  line 
  from 
  Pinmery 
  to 
  the 
  north 
  flank 
  

   of 
  Dalfask 
  Hill, 
  a 
  distance 
  of 
  more 
  than 
  a 
  mile 
  and 
  a 
  quarter. 
  

  

  At 
  its 
  eastern 
  extremity 
  it 
  is 
  seen 
  in 
  a 
  shattered 
  state 
  in 
  the 
  

   roadside 
  quarries 
  about 
  a 
  hundred 
  yards 
  from 
  the 
  lime 
  quarry. 
  It 
  

   there 
  consists 
  of 
  a 
  mass 
  of 
  sandy 
  gritstones 
  filled 
  with 
  small 
  pebbles 
  

   of 
  quartz, 
  greywacke, 
  and 
  various 
  species 
  of 
  igneous 
  rocks, 
  and 
  it 
  is 
  

   associated 
  with 
  distinctly 
  bedded 
  grey 
  wackes 
  and 
  shales 
  of 
  the 
  usual 
  

   type. 
  Fossils 
  are 
  procurable 
  with 
  difficulty, 
  mainly 
  Leptcena 
  sericea, 
  

   with 
  a 
  few 
  Lamellibranchiata 
  and 
  fragments 
  of 
  Encrinites. 
  

  

  In 
  the 
  road-side 
  close 
  to 
  the 
  farmhouse 
  of 
  .Barbae 
  the 
  grit 
  is 
  well 
  

   exposed 
  to 
  view 
  in 
  the 
  hill-face 
  and 
  roadway. 
  It 
  there 
  abounds 
  

   in 
  fragments 
  of 
  quartz, 
  and, 
  except 
  for 
  its 
  decidedly 
  gritty 
  matrix, 
  

   has 
  few 
  points 
  of 
  resemblance 
  to 
  the 
  typical 
  Balclatchie 
  grit. 
  

   It 
  contains 
  a 
  few 
  fossils 
  in 
  some 
  shaly 
  seams 
  at 
  its 
  summit. 
  Lep- 
  

   tcena, 
  BelleropJion 
  and 
  Ctenodonta 
  were 
  here 
  collected 
  by 
  myself. 
  

  

  At 
  its 
  westernmost 
  termination 
  the 
  grit 
  is 
  exposed 
  in 
  some 
  old 
  

   quarries 
  west 
  of 
  the 
  Dalfask 
  burn. 
  In 
  this 
  locality 
  it 
  is 
  identical 
  

   in 
  composition 
  and 
  texture 
  with 
  the 
  Barbae 
  bed, 
  but 
  is 
  weathered 
  

   to 
  a 
  greyish 
  yellow 
  tint, 
  and 
  is 
  apparently 
  more 
  fossiliferous 
  than 
  

   usual, 
  containing 
  many 
  fragmentary 
  examples 
  of 
  Leptcena, 
  Lincl- 
  

   strcemia 
  and 
  Encrinites. 
  

  

  Crossing 
  the 
  broad 
  sheet 
  of 
  Benan 
  Conglomerate 
  exposed 
  in 
  the 
  

   hill 
  of 
  Dalfask 
  and 
  the 
  valley 
  of 
  the 
  Assel, 
  we 
  again 
  come 
  upon 
  the 
  

   Balclatchie 
  transitional 
  beds 
  on 
  the 
  ridge 
  of 
  Daldowie 
  Hill. 
  They 
  

   occupy 
  their 
  normal 
  place 
  between 
  the 
  Benan 
  Conglomerate 
  and 
  the 
  

   great 
  mass 
  of 
  the 
  Graptolitic 
  flagstones, 
  which 
  here 
  stretch 
  in 
  un- 
  

   broken 
  mass 
  for 
  many 
  miles 
  south 
  westward, 
  across 
  the 
  lower 
  valley 
  

   of 
  the 
  Assel, 
  into 
  the 
  heart 
  of 
  the 
  igneous 
  region 
  of 
  Lendal 
  Water. 
  

   The 
  numerous 
  exposures 
  of 
  the 
  transitional 
  beds 
  shown 
  upon 
  the 
  

   hill-face 
  west 
  of 
  the 
  mountain-road 
  from 
  Pininore 
  to 
  Minuntion 
  

   present 
  us 
  with 
  phenomena 
  identical 
  with 
  those 
  afforded 
  by 
  the 
  corre- 
  

   sponding 
  geographical 
  band 
  between 
  Balclatchie 
  and 
  Pinmery. 
  

   The 
  highest 
  beds 
  of 
  the 
  Benan 
  Conglomerate 
  are 
  gritty 
  and 
  abound 
  

   with 
  quartz 
  pebbles, 
  varying 
  in 
  size 
  from 
  that 
  of 
  a 
  bullet 
  to 
  that 
  of 
  

   a 
  man's 
  head. 
  These 
  beds 
  are 
  repeated 
  in 
  anticlinal 
  folds 
  again 
  

   and 
  again 
  ; 
  and 
  in 
  the 
  synclinals 
  between 
  them 
  occur 
  the 
  concre- 
  

   tionary 
  and 
  Graptolitic 
  mudstones 
  and 
  the 
  coarse 
  green 
  sandy 
  rocks 
  

   of 
  the 
  Balclatchie 
  Beds. 
  In 
  one 
  or 
  two 
  spots 
  the 
  shales, 
  which 
  

   often 
  weather 
  to 
  a 
  yellowish 
  drab 
  colour, 
  afford 
  many 
  small 
  shells, 
  

   of 
  the 
  general 
  type 
  of 
  those 
  of 
  Balclatchie, 
  such 
  as 
  Strophornena 
  

   corrugatella, 
  Dav., 
  Leptcena 
  sericea, 
  Sow., 
  together 
  with 
  Ctenodonta 
  

   and 
  a 
  form 
  of 
  Ampyx. 
  

  

  3. 
  Ardmillan 
  Braes. 
  — 
  The 
  numerous 
  sections 
  of 
  the 
  Balclatchie 
  

   group 
  we 
  have 
  last 
  noticed 
  are 
  all 
  greatly 
  deficient 
  in 
  recognized 
  

   organic 
  remains. 
  In 
  all 
  probability 
  this 
  is 
  mainly 
  due 
  to 
  the 
  

  

  