﻿PROE. 
  C. 
  LAPWORTH 
  ON 
  THE 
  GIRVAN 
  SUCCESSION. 
  611 
  

  

  mitchell 
  through 
  Barbae 
  Hill 
  into 
  the 
  heights 
  of 
  Trowier, 
  parallel 
  to 
  

   the 
  northern 
  boundary 
  of 
  the 
  Benan 
  Conglomerate. 
  The 
  higher 
  

   zones 
  of 
  these 
  gritty 
  beds 
  become 
  more 
  sandy, 
  and 
  contain 
  seams 
  of 
  

   small 
  quartz 
  pebbles 
  here 
  and 
  there 
  ; 
  and 
  they 
  are, 
  I 
  suspect, 
  the 
  

   equivalents 
  of 
  the 
  Cascade-grits 
  of 
  the 
  Penwhapple 
  section 
  . 
  In 
  the 
  

   fields 
  N.W. 
  of 
  Barbae 
  they 
  contain 
  fragments 
  of 
  Encrinites 
  and 
  a 
  few 
  

   Brachiopods. 
  The 
  underlying 
  softer 
  shales 
  are 
  best 
  seen 
  on 
  both 
  

   sides 
  of 
  the 
  roadway 
  west 
  of 
  Barbae, 
  and 
  in 
  the 
  streams 
  near 
  Laggan, 
  

   where 
  they 
  contain 
  a 
  few 
  Graptolites. 
  

  

  In 
  the 
  great 
  sheet 
  of 
  Ardwell 
  flagstones 
  displayed 
  in 
  the 
  heights 
  

   of 
  Tralodden, 
  Trowier, 
  and 
  Balgavarie, 
  the 
  strata 
  are 
  so 
  broken 
  and 
  

   folded 
  that 
  no 
  extended 
  sections 
  are 
  visible. 
  Nevertheless 
  there 
  is 
  

   a 
  sufficiency 
  of 
  evidence 
  to 
  show 
  that 
  the 
  Benan 
  Conglomerate 
  rises 
  

   again 
  and 
  again 
  almost 
  to 
  the 
  surface, 
  while 
  the 
  various 
  zones 
  of 
  the 
  

   Ardmillan 
  series 
  are 
  often 
  recognizable 
  in 
  place 
  upon 
  the 
  ground. 
  

  

  Ba, 
  Ardwell 
  Beds, 
  — 
  Excellent 
  exposures 
  of 
  the 
  Knockgerran 
  or 
  

   lower 
  zones 
  of 
  the 
  Ardwell 
  Beds 
  are 
  afforded 
  by 
  the 
  two 
  small 
  

   streams 
  which 
  unite 
  at 
  the 
  farm 
  of 
  Tralodden. 
  The 
  beds 
  show 
  their 
  

   usual 
  striped 
  appearance, 
  contain 
  the 
  normal 
  cement-stones, 
  and 
  are 
  

   locally 
  crowded 
  with 
  

  

  Diplograptus 
  pristis, 
  His. 
  Cliniacograptus 
  eaudatus, 
  His. 
  

   foliaceus, 
  Murch. 
  Corynoides 
  calycularis, 
  Nich. 
  

  

  A 
  mass 
  of 
  similar 
  beds 
  is 
  cut 
  through 
  by 
  the 
  lower 
  reaches 
  of 
  the 
  

   Piedmont 
  Burn, 
  near 
  Glendoune. 
  This 
  is 
  included 
  between 
  two 
  

   divergent 
  branches 
  of 
  the 
  great 
  bounding 
  fault 
  of 
  the 
  Girvan 
  plateau. 
  

   This 
  fault, 
  as 
  will 
  be 
  evident 
  from 
  a 
  study 
  of 
  the 
  map, 
  splits 
  into 
  

   two 
  branches 
  north 
  of 
  the 
  summit 
  of 
  SaughHill: 
  and 
  in 
  the 
  in- 
  

   cluded 
  angle 
  between 
  them 
  we 
  find 
  examples 
  of 
  the 
  higher 
  parts 
  of 
  

   the 
  conglomerate 
  or 
  cascade 
  group, 
  together 
  with 
  some 
  of 
  the 
  lower 
  

   divisions 
  of 
  the 
  Ardmillan 
  series. 
  

  

  Fossils 
  occur 
  both 
  on 
  the 
  Hanks 
  of 
  Saugh 
  Hill 
  and 
  in 
  the 
  depths 
  

   of 
  Piedmont 
  Glen. 
  At 
  the 
  latter 
  locality 
  I 
  have 
  collected 
  

  

  Diplograptus 
  pristis, 
  His. 
  Corynoides 
  calycularis, 
  Nich. 
  

   foliaceus, 
  Murch. 
  

  

  Diplograptus 
  foliaceus 
  and 
  Corynoides 
  calycularis 
  occur 
  also 
  in 
  

   the 
  quarries 
  on 
  Fauldribban 
  Hill. 
  

  

  In 
  Piedmont 
  Glen 
  the 
  middle 
  zones 
  of 
  the 
  Ardwell 
  Shales 
  are 
  

   crowded 
  with 
  Graptolites 
  at 
  the 
  foot 
  of 
  the 
  small 
  burn 
  which 
  de- 
  

   scends 
  from 
  Laggan 
  Loch. 
  Here 
  are 
  found 
  in 
  excellent 
  pre- 
  

   servtion 
  : 
  — 
  

  

  Diplograptus 
  foliaceus, 
  Murch. 
  Climacograptus 
  eaudatus, 
  Lapw. 
  

   pristis, 
  His. 
  Corynoides 
  calycularis, 
  Nich. 
  

  

  At 
  the 
  foot 
  of 
  the 
  glen 
  itself 
  occasional 
  examples 
  of 
  Lasiograptus 
  

   margaritatus, 
  Lapw., 
  and 
  Diplograptus 
  foliaceus, 
  Murch., 
  are 
  met 
  

   with 
  in 
  the 
  contorted 
  beds. 
  They 
  occur 
  also 
  in 
  corresponding 
  strata 
  

   upon 
  the 
  low 
  mound 
  of 
  Shalloch 
  Hill. 
  

  

  A 
  similar 
  faulted 
  patch 
  of 
  the 
  Knockgerran 
  zone 
  of 
  the 
  Ardwell 
  

   Beds 
  occurs 
  near 
  the 
  farm 
  of 
  Pinmacher, 
  and 
  is 
  cut 
  through 
  by 
  the 
  

  

  