﻿PROP. 
  C. 
  LAPWORTH 
  OjST 
  THE 
  GIRVAIST 
  SUCCESSION. 
  

  

  627 
  

  

  however, 
  is 
  visible 
  ; 
  and 
  the 
  quarry 
  itself 
  is 
  filled 
  with 
  fragments 
  of 
  

   the 
  coarse 
  gritstones 
  collected 
  from 
  off 
  the 
  surface 
  of 
  the 
  fields. 
  

  

  About 
  twenty 
  yards 
  further, 
  in 
  the 
  same 
  direction, 
  however, 
  most 
  

   valuable 
  testimony 
  is 
  afforded 
  us 
  by 
  a 
  few 
  limited 
  sections 
  in 
  a 
  

   small 
  burn-course 
  in 
  a 
  narrow 
  strip 
  of 
  plantation. 
  Here 
  occur 
  

   pale 
  saudstones 
  and 
  calcareous 
  flagstones, 
  weathering 
  of 
  the 
  same 
  

   light 
  yellow 
  tint 
  as 
  the 
  generality 
  of 
  the 
  rocks 
  of 
  this 
  subdivision. 
  

   They 
  split 
  up 
  under 
  the 
  hammer 
  into 
  angular 
  fragments, 
  and 
  

   contain 
  an 
  abundance 
  of 
  casts 
  of 
  fossils. 
  They 
  yield 
  examples 
  

   of 
  the 
  characteristic 
  Mulloch-Hill 
  forms 
  — 
  Atrypa 
  hemisphcerica, 
  

   Sow., 
  Nidulites 
  favus, 
  Salt., 
  Rhynchonella 
  cuneata, 
  Dalm., 
  IUcenus 
  

   Thompson^ 
  Salt., 
  — 
  and, 
  in 
  addition, 
  a 
  host 
  of 
  new 
  and 
  very 
  striking 
  

   forms 
  unknown 
  in 
  the 
  underlying 
  series, 
  including 
  Pentamerus 
  lens, 
  

   Pentamerus 
  oblongus, 
  'Atrypa 
  imbricata, 
  Phacops 
  StoJcesii, 
  Proetus 
  

   StoJcesii, 
  Encrinurus 
  punctatus, 
  &c. 
  

  

  Of 
  the 
  strata 
  which 
  follow 
  immediately 
  upon 
  these 
  Pentamerus- 
  

   flagstones, 
  we 
  know 
  very 
  little 
  further 
  from 
  this 
  locality. 
  An 
  

   exposure 
  of 
  a 
  few 
  of 
  the 
  beds 
  of 
  the 
  same 
  zone 
  occurs 
  in 
  the 
  same 
  

   plantation 
  a 
  few 
  hundred 
  yards 
  to 
  the 
  northward 
  ; 
  and 
  a 
  limited 
  

   section 
  of 
  shales 
  weathering 
  to 
  a 
  purple 
  colour, 
  in 
  the 
  ditches 
  at 
  the 
  

   edge 
  of 
  Glenshalloch 
  Wood. 
  

  

  (iii.) 
  The 
  Graplolitic 
  Shales 
  of 
  Glenshalloch. 
  

  

  The 
  yellow- 
  weathering 
  Pentamerus- 
  conglomerates, 
  grits, 
  and 
  flag- 
  

   stones 
  of 
  Newlands 
  are 
  succeeded 
  to 
  the 
  eastward 
  by 
  a 
  thick 
  mass 
  

   of 
  soft 
  shales 
  and 
  flags, 
  of 
  a 
  dark 
  greyish-green 
  colour. 
  They 
  

  

  Fig. 
  23. 
  Section 
  of 
  the 
  Pentamerus 
  and 
  Graptolitic 
  Beds 
  of 
  

   Baldrennan 
  Burn. 
  

  

  N.W. 
  

  

  JBa.Ldren.nacn. 
  J3u.r/v. 
  

  

  I 
  nfCAUS 
  JSeos 
  

  

  x. 
  Lower 
  Carboniferous 
  sandstones, 
  shales, 
  and 
  limestone. 
  

   Cb 
  2 
  . 
  Glenshalloch 
  shales. 
  

  

  (b). 
  Grey 
  and 
  striped 
  Graptolitic 
  shales 
  and 
  mudstones, 
  with 
  Bastrites 
  

   peregrinus, 
  Monograplus 
  fimbriatus, 
  &c. 
  

  

  (a). 
  Pale 
  flagstones, 
  non-fossiliferous. 
  

   Cb 
  1 
  . 
  Pentamerus-beds 
  of 
  Newlands. 
  

  

  c. 
  Yellow-weathering 
  calcareous 
  flagstone, 
  with 
  Pentamerus 
  

   Atrypa 
  reticidaris, 
  Encrinurus 
  punctatus. 
  

  

  b. 
  Pale 
  blue 
  flagstone. 
  

  

  a. 
  Coarse 
  yellow 
  conglomeratic 
  gritstones. 
  

  

  occupy 
  all 
  the 
  remaining 
  portion 
  of 
  the 
  Lower 
  Palaeozoic 
  area, 
  and 
  

  

  