﻿PROF. 
  C. 
  LAP 
  WORTH 
  ON 
  THE 
  OTRVAN 
  SUCCESSION. 
  

  

  613 
  

  

  i\.W. 
  

  

  Fig. 
  19. 
  — 
  Section 
  in 
  Ddlamford 
  Glen. 
  

  

  Mi 
  

  

  0l 
  o 
  ffeo 
  

   Sandstone. 
  

  

  A 
  row£ 
  i 
  i 
  £eds 
  

  

  Old 
  Eed 
  Sandstone 
  : 
  — 
  

  

  Coarse 
  red 
  conglomerates 
  and 
  red 
  and 
  yellow 
  flagstones. 
  

   Ardwell 
  beds, 
  Cascade-zone. 
  

  

  3. 
  Calcareous 
  grits, 
  with 
  partings 
  of 
  green 
  and 
  grey 
  shales. 
  

   2. 
  Green 
  nodular 
  sandstones, 
  non-fossiliferous. 
  

  

  1. 
  Black 
  carbonaceous 
  and 
  ferruginous 
  shales, 
  with 
  occasional 
  hard 
  arena- 
  

   ceous 
  ribs 
  — 
  Lingula, 
  Dicellograptus 
  Forchhammeri, 
  Dijilograptus 
  ru- 
  

   gosus, 
  D. 
  foliaceus, 
  Climacograptus 
  caudatus, 
  &c. 
  

  

  Strata 
  belonging 
  to 
  the 
  higher 
  or 
  Upper 
  division 
  have 
  been 
  detected 
  

   only 
  at 
  a 
  single 
  locality 
  between 
  the 
  two 
  exposures 
  of 
  Myoch 
  Bay 
  

   and 
  Penwhapple 
  Glen, 
  already 
  described, 
  namely, 
  in 
  the 
  central 
  parts 
  

   of 
  the 
  gully 
  formed 
  by 
  the 
  north-east 
  fork 
  of 
  Piedmont 
  Burn. 
  Here 
  

   the 
  purple 
  and 
  green 
  mudstones 
  of 
  the 
  Upper 
  Whitehouse 
  variegated 
  

   beds 
  form 
  the 
  bed 
  and 
  banks 
  of 
  the 
  stream-course 
  for 
  some 
  little 
  

   distance, 
  in 
  their 
  natural 
  geological 
  place 
  between 
  the 
  Ardwell 
  beds 
  of 
  

   Trowier 
  Hill 
  and 
  the 
  JS'ematolites-heaTmg 
  flagstones 
  of 
  Doune 
  Hill. 
  

   They 
  are 
  much 
  shattered, 
  and 
  have 
  afforded 
  no 
  recognizable 
  fossils. 
  

   The 
  boundaries 
  of 
  this 
  zone, 
  as 
  given 
  upon 
  Plates 
  XXIV. 
  andXXY., 
  

   west 
  of 
  Penwhapple 
  Glen, 
  are 
  almost 
  purely 
  inferential, 
  as 
  hardly 
  

   any 
  sections 
  are 
  visible 
  upon 
  the 
  ground. 
  

  

  B. 
  Barren 
  Flagstones. 
  — 
  The 
  succeeding 
  Barren-flagstone 
  beds 
  form 
  

   a 
  broad 
  zone, 
  about 
  four 
  miles 
  in 
  length 
  and 
  half 
  a 
  mile 
  in 
  width, 
  

   which 
  ranges 
  from 
  the 
  summit 
  of 
  Doune 
  Hill 
  across 
  the 
  glen 
  of 
  Pen- 
  

   whapple 
  into 
  the 
  moorland 
  area 
  north-west 
  of 
  Knockgerran. 
  The 
  

   central 
  section 
  of 
  this 
  zone 
  in 
  Penwhapple 
  Glen, 
  already 
  described, 
  

   is 
  typical 
  of 
  the 
  general 
  arrangement 
  of 
  these 
  strata 
  from 
  end 
  to 
  

   end 
  of 
  the 
  band. 
  The 
  thin-bedded 
  zones 
  near 
  the 
  base 
  of 
  the 
  group 
  

   are 
  well 
  seen 
  on 
  the 
  southern 
  and 
  south-western 
  slopes 
  of 
  Doune 
  

   Hill. 
  The 
  higher 
  and 
  flaggy 
  beds 
  are 
  laid 
  open 
  at 
  several 
  spots 
  

   upon 
  the 
  heights 
  between 
  Saugh 
  Hill 
  and 
  Penwhapple 
  ; 
  and 
  by 
  their 
  

   disposition 
  upon 
  the 
  ground 
  enable 
  us 
  to 
  mark 
  out 
  with 
  some 
  ap- 
  

   proach 
  to 
  certainty 
  the 
  line 
  of 
  the 
  fault 
  which 
  bounds 
  the 
  band 
  to 
  

   the 
  northward. 
  In 
  Saugh-Hill 
  Burn 
  itself 
  they 
  afford 
  specimens 
  of 
  

   the 
  characteristic 
  fossil 
  Nematolites 
  Grayii; 
  and 
  in 
  some 
  quarries 
  

   about 
  a 
  mile 
  to 
  the 
  eastward, 
  they 
  yield 
  examples 
  of 
  Diplograptus 
  

   pristis 
  and 
  D. 
  truncatus. 
  There 
  are 
  many 
  exposures 
  of 
  the 
  same 
  

   beds 
  south 
  and 
  east 
  of 
  %e 
  farmstead 
  of 
  Littlelane 
  ; 
  but 
  no 
  fossils 
  have 
  

   been 
  obtained 
  from 
  them. 
  

  

  