﻿660 
  

  

  PROF. 
  C. 
  LAPWORTH 
  ON 
  THE 
  GIRYAN 
  SUCCESSION. 
  

  

  Pig. 
  31. 
  — 
  Detailed 
  Vertical 
  Section 
  of 
  the 
  Strata 
  of 
  the 
  Girvan 
  Succession. 
  

   (Scale 
  1 
  inch 
  =480 
  feet.) 
  

  

  Upper 
  Palaeozoic 
  rocks, 
  Old 
  Red 
  Sandstone, 
  ^'^Llii-i 
  ^"l^v 
  

  

  and 
  Carboniferous 
  

  

  ( 
  ((c) 
  Straiton 
  G-boup, 
  900 
  ft. 
  

  

  4. 
  Straiton 
  grits 
  and 
  conglomerate 
  

  

  

  5. 
  Knockgardner 
  shales 
  

  

  2. 
  Blair 
  flags 
  and 
  shale 
  

  

  1. 
  Druniyork 
  flagstones 
  . 
  . 
  

  

  (b) 
  Bargany 
  Group, 
  700 
  ft. 
  

  

  2. 
  Blackwood 
  beds 
  , 
  

  

  1. 
  G-lenfoot 
  pale 
  flags 
  and 
  shales 
  

  

  (a) 
  Penkill 
  Group, 
  1000 
  ft. 
  

   4. 
  Cyrtogr 
  apt 
  us- 
  Grayi 
  mud- 
  

   [stone 
  

  

  3. 
  Protovirgularia-grits 
  

  

  Penkill 
  flags 
  and 
  shales 
  

  

  I 
  1. 
  Crossopodia-shales 
  

  

  ((c) 
  Camregan 
  Group, 
  200 
  ft. 
  

   •3. 
  JRastrites-maximus 
  shales 
  

   2. 
  Camregan 
  limestone 
  

   1. 
  MhynckoneUa-grita 
  

   (b) 
  Saugh-Hill 
  Group, 
  500 
  ft, 
  

  

  Coarse 
  purple 
  and 
  grey 
  grits 
  and 
  conglomerates, 
  non- 
  

   fossiliferous. 
  

  

  gpg^ 
  Flaggy 
  shales, 
  with 
  Beyrichia 
  Kloedeni 
  &c. 
  

  

  (c) 
  Monograptus- 
  Sedgwickii 
  beds... 
  i^^^^ffg^^P 
  

  

  (6) 
  Saugh-Hill 
  sandstones 
  and 
  grits 
  &-'■ 
  r 
  ' 
  ^^r^—- 
  

  

  (a) 
  Woodland 
  Beds. 
  

   (c) 
  Modestus-shales 
  

  

  (b) 
  Woodland 
  limestone 
  

  

  (a) 
  Craigskelly 
  conglomerate 
  

  

  (a) 
  Mulloch-Hill 
  Group, 
  350 
  ft. 
  

  

  3. 
  Glenwells 
  pale 
  shales 
  

  

  2. 
  Mulloch-Hill 
  sandstone 
  

  

  1. 
  Mulloch-Hill 
  conglomerate 
  

  

  !^<*%^^y^ 
  

  

  Grey 
  flags 
  and 
  pale 
  green 
  flaky 
  shales. 
  

   vomerinus, 
  Cardiola, 
  &c. 
  

  

  Monograptus, 
  

  

  Olive-green 
  flags 
  and 
  shales, 
  non-fossiliferous. 
  

  

  Pale 
  yellow 
  and 
  blue 
  and 
  grey 
  flagstones, 
  with 
  thick 
  

   zones 
  of 
  pale 
  green 
  and 
  ribbed 
  shales. 
  — 
  Monograptus 
  > 
  

   acus 
  &c. 
  

  

  Pale 
  blue 
  and 
  grey 
  thick-bedded 
  flagstones, 
  with 
  many 
  

   zones 
  of 
  pale 
  grey 
  and 
  buff 
  weathering 
  shale. 
  

  

  Purple 
  mudstones, 
  with 
  calcareous 
  seams. 
  — 
  Monograp- 
  

   tus 
  priodon, 
  Cyrtograptus 
  Grayi, 
  Betiolites 
  Geinitzi- 
  

   anus, 
  &c. 
  

  

  Thick-bedded 
  green 
  and 
  grey 
  grits, 
  with 
  Annelides 
  and 
  

   Protovirgularia, 
  Monograptus 
  galaensis. 
  

  

  Alternations 
  of 
  grey 
  and 
  green 
  flagstones 
  and 
  shales.— 
  

   Monograptus 
  exiguus. 
  

  

  Purple 
  shales 
  and 
  mudstones, 
  with 
  Crossopodia 
  scotica, 
  

   Nemertites 
  tenuis, 
  &c. 
  

  

  Thick-bedded 
  yellow 
  grits, 
  purple 
  and 
  grey 
  mudstones, 
  

   and 
  a 
  band 
  of 
  impure 
  limestone. 
  — 
  Bastrites 
  maxi- 
  

   mus, 
  Pentamerus 
  oblongus, 
  &c. 
  

  

  Black 
  carbonaceous 
  mudstones, 
  with 
  Monograptus 
  

   SedgivicJcii, 
  Bastrites 
  maximus, 
  &c. 
  

  

  ggy 
  sandstones, 
  quartz 
  conglomerates, 
  

   lags. 
  

  

  Black 
  and 
  striped 
  Graptolitic 
  shales, 
  with 
  Diplograptus 
  

   modestus; 
  limestone 
  with 
  Stricklandinia 
  lens; 
  and 
  

   zone 
  of 
  boulder-conglomerate. 
  

  

  Pale 
  blue 
  shales 
  and 
  mudstones, 
  with 
  Ptilograptus. 
  

  

  Bed, 
  grey, 
  and 
  yellow 
  sandstones, 
  with 
  partings 
  of 
  

   sandy 
  shales, 
  crowded 
  with 
  Brachiopoda, 
  Meristella 
  

   angustifrons 
  , 
  Atrypa 
  hemisphcerica, 
  &c. 
  

  

  Coarse 
  yellow 
  flc 
  

   and 
  pale 
  grey 
  

  

  Purple 
  boulder-conglomerate. 
  

  

  