﻿PROP. 
  C. 
  LAPWOETH 
  OX 
  THE 
  GIRT 
  AX 
  SUCCESSION. 
  619 
  

  

  they 
  deserve 
  rather 
  the 
  title 
  of 
  bedded 
  mudstones, 
  occurring 
  in 
  

   distinct 
  bands 
  at 
  least 
  a 
  foot 
  in 
  thickness. 
  The 
  terminal 
  beds 
  are 
  

   soft 
  sandy 
  mudstones, 
  weathering 
  down 
  into 
  irregularly 
  rounded 
  

   fragments, 
  coated 
  exteriorly 
  with 
  oxide 
  of 
  iron. 
  

  

  Fossils 
  are 
  tolerably 
  abundant 
  throughout, 
  more 
  especially 
  in 
  the 
  

   central 
  beds, 
  which 
  afford, 
  among 
  others 
  : 
  — 
  

  

  Trinucleus 
  seticornis, 
  His. 
  Bellerophon 
  bilobatus, 
  Sow. 
  

  

  Am 
  pyx 
  rostratus, 
  Sars. 
  

  

  Illamus, 
  sp. 
  

  

  Dionide, 
  sp. 
  

  

  Calyniene 
  Blumenbachii, 
  Brongn. 
  

  

  perturbatus, 
  Souk 
  

  

  Ortbis 
  calligramma. 
  Bairn,. 
  

  

  elegantula, 
  Balm. 
  

  

  Leptaena 
  sericea, 
  Sow. 
  

  

  On 
  the 
  north-east 
  side 
  of 
  Quarrel 
  Hill 
  no 
  exposures 
  are 
  apparent 
  ; 
  

   but 
  a 
  short 
  distance 
  to 
  the 
  westward 
  the 
  stream 
  of 
  the 
  Lady 
  Burn 
  

   has 
  excavated 
  a 
  most 
  interesting 
  and 
  instructive 
  series 
  of 
  sections 
  

   more 
  than 
  a 
  mile 
  in 
  length 
  through 
  the 
  higher 
  zones 
  of 
  the 
  group. 
  

  

  2. 
  Lady 
  Burn. 
  — 
  Near 
  the 
  head 
  of 
  the 
  Lady 
  Burn 
  we 
  find 
  the 
  

   purple 
  Mulloch-Hill 
  conglomerate 
  crossing 
  the 
  little 
  stream-valley 
  

   almost 
  at 
  right 
  angles 
  to 
  the 
  course 
  of 
  the 
  burn. 
  Over 
  this 
  intrac- 
  

   table 
  rock 
  the 
  waters 
  of 
  the 
  stream 
  leap 
  in 
  a 
  small 
  waterfall, 
  at 
  the 
  

   base 
  of 
  which 
  the 
  highest 
  known 
  strata 
  of 
  the 
  Trinucleus- 
  or 
  Drum- 
  

   muck-beds 
  are 
  seen, 
  dipping 
  steadily 
  and 
  conformably 
  underneath 
  the 
  

   conglomerate 
  at 
  an 
  angle 
  of 
  about 
  40°. 
  They 
  are 
  soft, 
  blue 
  mudstones, 
  

   homogeneous, 
  thick-bedded, 
  and 
  more 
  or 
  less 
  concretionary 
  in 
  struc- 
  

   ture, 
  breaking 
  up 
  under 
  the 
  hammer 
  into 
  irregular 
  and 
  crumbling 
  

   fragments. 
  Exteriorly 
  they 
  are 
  stained 
  with 
  rusty 
  oxide 
  of 
  iron 
  ; 
  

   interiorly 
  they 
  are 
  pierced 
  by 
  frequent 
  inosculating 
  worm-burrows, 
  

   stained 
  of 
  a 
  dingy 
  red. 
  Fossils 
  are 
  very 
  rare 
  ; 
  only 
  an 
  occasional 
  

   Brachiopod 
  is 
  discernible. 
  

  

  At 
  their 
  base, 
  however, 
  they 
  contain 
  a 
  fossiliferous 
  band, 
  the 
  abun- 
  

   dant 
  organic 
  remains 
  of 
  which 
  fully 
  compensate 
  for 
  the 
  barren 
  nature 
  

   of 
  the 
  beds 
  above. 
  Fragments 
  of 
  this 
  fossiliferous 
  band 
  are 
  exposed 
  

   in 
  an 
  old 
  quarry 
  opened 
  for 
  procuring 
  materials 
  for 
  the 
  neighbouring 
  

   stone 
  walls, 
  in 
  which 
  an 
  occasional 
  slab 
  from 
  the 
  fossil 
  seam 
  may 
  

   even 
  yet 
  be 
  detected. 
  The 
  bed 
  itself 
  is 
  a 
  hard 
  greenish-grey 
  sand- 
  

   stone, 
  a 
  few 
  inches 
  in 
  thickness, 
  and 
  highly 
  calcareous. 
  It 
  is 
  almost 
  

   made 
  up 
  of 
  fossil 
  remains, 
  many 
  being 
  in 
  an 
  excellent 
  state 
  of 
  

   preservation. 
  

  

  Among 
  others, 
  I 
  have 
  collected 
  from 
  this 
  bed 
  : 
  — 
  

  

  Palreaster 
  Wyville-Tborasoni, 
  R. 
  Eth. 
  

   Trinucleus 
  Bucklandi. 
  Barr. 
  

   Illaenus 
  Bowmaiini, 
  Salt. 
  

   Staurocepbalus 
  globiceps, 
  Bortl. 
  

   Calymene 
  Blimienbacbii, 
  Brongn. 
  

  

  Leptaena 
  sericea, 
  Sow. 
  

   Ortbis 
  calligramma, 
  Balm, 
  

   Conularia 
  Sowerbyii, 
  Befr. 
  

   Strophomena 
  grandis, 
  Sotv. 
  

  

  together 
  with 
  forms 
  of 
  corals 
  and 
  Polyzoa 
  of 
  undeterminable 
  specific 
  

   characters. 
  

  

  The 
  shales 
  immediately 
  below 
  the 
  Starfish-bed 
  range 
  down 
  the 
  

   remainder 
  of 
  the 
  stream-course 
  to 
  the 
  farm 
  of 
  Drummuck, 
  and 
  are 
  

   shown 
  in 
  an 
  abundance 
  of 
  natural 
  sections. 
  They 
  have 
  been 
  fre- 
  

   quently 
  examined 
  by 
  Mrs. 
  Gray 
  and 
  the 
  officers 
  of 
  the 
  Geological 
  

   Survey, 
  and 
  have 
  long 
  been 
  noted 
  for 
  the 
  abundance 
  and 
  beauty 
  of 
  

  

  2t2 
  

  

  