﻿624 
  THOF. 
  C. 
  LAPWOKTH 
  ON 
  THE 
  GIRT 
  AN 
  SUCCESSION. 
  

  

  Fig. 
  22. 
  Section 
  of 
  the 
  Strata 
  of 
  Glemvells 
  Burn. 
  

  

  N.W. 
  

  

  j 
  \ 
  

  

  

  <3J> 
  6lenw*ll* 
  SAal&f. 
  Cb. 
  Jfcujlands 
  Grits 
  

  

  a\ 
  Lower 
  Carboniferous 
  sandstones 
  and 
  shales 
  (invisible 
  along 
  line 
  of 
  section) 
  

   Cb. 
  Newlands 
  grits 
  and 
  conglomerates. 
  

   2. 
  Yellow 
  sandstones 
  and 
  flaggy 
  grits. 
  

  

  1. 
  Coarse 
  yellow 
  conglomerate. 
  

   Cab. 
  Grlenwells 
  shales. 
  

  

  (2) 
  Pale-blue 
  flags 
  and 
  shales, 
  with 
  Climacograptus 
  normaiis. 
  

   (1) 
  Pale-blue 
  flags 
  and 
  shales, 
  non-fossiliferous. 
  

   Ca* 
  Mulloch-Hill 
  beds. 
  

  

  2. 
  Yellow 
  sandy 
  shales, 
  with 
  Leptana, 
  Orthis, 
  and 
  Strophomcna. 
  

   1. 
  Brachiopod-sandstones 
  of 
  Rough 
  Neuk. 
  

  

  // 
  Faults. 
  

  

  In 
  the 
  stream 
  which, 
  descends 
  from 
  the 
  north-east 
  slope 
  of 
  Kirk 
  

   Hill, 
  and 
  flows 
  past 
  Hough 
  IN 
  T 
  euk 
  to 
  the 
  cottage 
  of 
  Glen 
  wells, 
  a 
  

   tolerably 
  complete 
  section 
  of 
  the 
  strata 
  above 
  the 
  shelly 
  sandstones 
  of 
  

   Mulloch 
  Hill 
  is 
  laid 
  open 
  (fig. 
  22). 
  Near 
  the 
  head 
  of 
  the 
  stream, 
  a 
  

   short 
  distance 
  below 
  the 
  roadway, 
  shell-bearing 
  beds 
  are 
  discovered, 
  

   dipping 
  steadily 
  to 
  the 
  S.E. 
  oft 
  the 
  sandstone 
  group 
  of 
  Rough 
  Neuk. 
  

   Lower 
  down 
  these 
  beds 
  are 
  followed, 
  after 
  an 
  interval, 
  by 
  a 
  series 
  

   of 
  blue 
  and 
  green 
  mudstones 
  with 
  intercalated 
  harder 
  ribs. 
  These 
  

   strata 
  have 
  the 
  same 
  general 
  inclination 
  as 
  the 
  Eough-JSTeuk 
  beds 
  ; 
  

   but 
  there 
  is 
  some 
  doubt 
  whether 
  they 
  succeed 
  them 
  in 
  conformable 
  

   sequence. 
  They 
  continue 
  to 
  occupy 
  the 
  bed 
  of 
  the 
  stream 
  for 
  some 
  

   distance, 
  dipping 
  at 
  an 
  average 
  angle 
  of 
  about 
  50°, 
  the 
  beds 
  becoming 
  

   somewhat 
  flaggier 
  as 
  we 
  ascend 
  in 
  the 
  succession. 
  They 
  appear 
  to 
  

   be 
  generally 
  barren 
  of 
  fossils, 
  except 
  in 
  certain 
  thin 
  seams 
  of 
  striped 
  

   shales, 
  which 
  have 
  afforded 
  me 
  

  

  Climacograptus 
  scalaris, 
  His, 
  I 
  ? 
  Monograptus 
  tenuis, 
  Portl. 
  

  

  Dimorphograptus 
  acuminatus, 
  Nick. 
  \ 
  

  

  At 
  this 
  point 
  occurs 
  another 
  unfortunate 
  break 
  in 
  the 
  section, 
  and 
  

   no 
  rock-exposures 
  are 
  seen 
  for 
  a 
  distance 
  of 
  between 
  40 
  and 
  50 
  yards. 
  

   These 
  pale-blue 
  mudstones 
  and 
  flags 
  of 
  Glenwells 
  are 
  thus 
  com- 
  

   pletely 
  isolated 
  as 
  regards 
  their 
  stratigraphical 
  position. 
  It 
  is 
  by 
  

   no 
  means 
  improbable 
  that 
  they 
  are 
  separated 
  from 
  the 
  true 
  Mulloch- 
  

   Hill 
  beds 
  by 
  an 
  important 
  branch 
  of 
  the 
  Craighead 
  dislocation, 
  

   which 
  has 
  cut 
  out 
  the 
  basal 
  zones 
  of 
  the 
  Newlands 
  series. 
  They 
  

   agree 
  exactly, 
  however, 
  in 
  dip 
  and 
  strike 
  with 
  the 
  underlying 
  

   Mulloch-Hill 
  beds, 
  while 
  mineralogically 
  they 
  appear 
  to 
  be 
  nothing 
  

   more 
  than 
  the 
  upward 
  prolongation 
  of 
  the 
  Ptiloc/rajitus-sh&les 
  at 
  the 
  

   summit 
  of 
  that 
  group. 
  The 
  strata 
  next 
  visible 
  are 
  so 
  distinct 
  in 
  

   their 
  lithological 
  characters 
  that 
  they 
  must 
  be 
  regarded 
  as 
  belonging 
  

   to 
  a 
  new 
  subformation. 
  Hence 
  it 
  will 
  be 
  convenient 
  provisionally 
  

   to 
  regard 
  the 
  Mulloch-Hill 
  beds 
  as 
  terminated 
  by 
  these 
  blue 
  mud- 
  

   stones, 
  below 
  which 
  the 
  descending 
  succession 
  is 
  tolerably 
  continuous 
  

   down 
  into 
  the 
  basal 
  conglomerate 
  of 
  High 
  Mains 
  and 
  Craigens. 
  

  

  