﻿440 
  PBOCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Jime 
  22, 
  

  

  by 
  mud-ripples 
  and 
  tracks, 
  probably 
  those 
  of 
  Crustaceans. 
  Besides 
  

   these, 
  there 
  are, 
  at 
  regular 
  intervals, 
  a 
  series 
  of 
  linear 
  markings, 
  

   such 
  as 
  might 
  have 
  been 
  produced 
  by 
  the 
  action 
  of 
  the 
  fins 
  of 
  Fishes 
  

   striking 
  upon 
  mud 
  ; 
  and 
  also 
  the 
  casts 
  of 
  worm-burrows. 
  As 
  these 
  

   latter 
  occur 
  on 
  the 
  under 
  side 
  of 
  the 
  sandstones 
  resting 
  upon 
  the 
  shale- 
  

   beds, 
  they 
  are 
  natural 
  casts 
  in 
  relief 
  of 
  the 
  original 
  impressions. 
  

  

  From 
  this 
  point, 
  north- 
  north 
  -east, 
  thick 
  yellow 
  sandstones, 
  simi- 
  

   lar 
  to 
  those 
  of 
  Bishops 
  Mill 
  quarries, 
  near 
  Elgin, 
  are 
  seen, 
  and 
  they 
  

   continue 
  until 
  the 
  south-east 
  side 
  of 
  Wilkhaven 
  is 
  reached. 
  These 
  

   sandstones, 
  I 
  believe, 
  are 
  identical 
  in 
  position 
  with 
  the 
  Bishops 
  Mill 
  

   strata, 
  and 
  although, 
  so 
  far 
  as 
  I 
  could 
  discover, 
  they 
  have 
  as 
  yet 
  

   afforded 
  no 
  fossils, 
  I 
  expect 
  that 
  in 
  them 
  the 
  same 
  form 
  of 
  Holo- 
  

   pty 
  chius 
  as 
  that 
  of 
  Bishops 
  Mill 
  will 
  be 
  found 
  when 
  they 
  have 
  been 
  

   carefully 
  examined. 
  

  

  The 
  arenaceous 
  strata 
  which 
  succeed 
  the 
  Geanies 
  equivalents 
  of 
  

   the 
  Caithness 
  flags, 
  as 
  seen 
  in 
  the 
  coast-section, 
  are 
  also 
  oblique 
  to 
  

   the 
  dip. 
  Allowing 
  for 
  this 
  obliquity, 
  the 
  thickness 
  of 
  this 
  series, 
  

   from 
  the 
  top 
  of 
  the 
  Geanies 
  grey 
  beds 
  to 
  the 
  strata 
  seen 
  at 
  Wilk- 
  

   haven, 
  where 
  the 
  sandstones 
  are 
  succeeded 
  by 
  conglomerates, 
  would 
  

   be 
  about 
  1800 
  feet. 
  

  

  The 
  rocks 
  which 
  make 
  their 
  appearance 
  at 
  Wilkhaven 
  consist 
  of 
  

   purple 
  sandstones 
  and 
  conglomerates, 
  the 
  latter 
  being 
  principally 
  

   made 
  up 
  of 
  quartz-pebbles. 
  These 
  rocks 
  continue 
  along 
  the 
  coast 
  to 
  

   Tarbetness, 
  and 
  they 
  have 
  a 
  thickness 
  of 
  about 
  200 
  feet. 
  They 
  

   are 
  the 
  representatives 
  here 
  of 
  the 
  pebble-beds 
  and 
  conglomerates 
  

   which 
  overlie 
  the 
  Bishops 
  Mill 
  sandstones, 
  and 
  the 
  beds 
  which 
  un- 
  

   derlie 
  the 
  white 
  sandstones, 
  beneath 
  the 
  Cothall 
  limestone 
  in 
  the 
  

   Findhorn 
  section. 
  To 
  these 
  conglomeratic 
  rocks 
  there 
  succeed 
  light- 
  

   coloured 
  sandstones, 
  with 
  pebbles 
  and 
  occasional 
  red 
  layers, 
  and 
  in 
  

   them 
  Reptilian 
  footprints 
  have 
  been 
  found. 
  These 
  sandstones 
  con- 
  

   tinue 
  along 
  the 
  coast 
  south-west 
  of 
  Tarbetness 
  to 
  Cambus-Shand- 
  

   wick, 
  where 
  the 
  highest 
  members 
  of 
  the 
  continuous 
  section 
  from 
  the 
  

   metamorphic 
  rocks 
  of 
  the 
  Mgg 
  occur. 
  These 
  higher 
  sandstones 
  

   continue 
  from 
  Cambus-Shandwick 
  to 
  Portmahomack, 
  about 
  a 
  mile 
  

   southward, 
  the 
  strata 
  affording 
  numerous 
  Reptilian 
  impressions, 
  the 
  

   beds 
  being 
  usually 
  light 
  in 
  colour 
  and 
  thin 
  -bedded, 
  with 
  occasional 
  

   red 
  layers. 
  The 
  surfaces 
  of 
  the 
  sandstones 
  are 
  often 
  separated 
  by 
  

   thin 
  way-bands 
  of 
  red 
  clay, 
  which 
  rinds 
  its 
  way 
  into 
  the 
  joints, 
  

   staining 
  the 
  outside 
  of 
  the 
  arenaceous 
  rocks, 
  while 
  their 
  interior 
  

   exhibits 
  a 
  light 
  colour. 
  

  

  The 
  impressions 
  which 
  the 
  zeal 
  and 
  energy 
  of 
  the 
  Rev. 
  Mr. 
  Camp- 
  

   bell, 
  of 
  Tarbet, 
  have 
  laid 
  bare, 
  consist 
  for 
  the 
  most 
  part 
  of 
  Ichnolites, 
  

   identical 
  with 
  those 
  found 
  in 
  the 
  Cummingstone 
  quarries, 
  the 
  form 
  

   of 
  the 
  impressions, 
  their 
  size, 
  and 
  also 
  the 
  length 
  of 
  the 
  strides 
  being 
  

   usually 
  precisely 
  similar. 
  

  

  Besides 
  these 
  footprints, 
  there 
  are 
  others 
  somewhat 
  different 
  ; 
  

   among 
  which 
  is 
  one 
  with 
  a 
  well-marked 
  continuous 
  furrow 
  be- 
  

   tween 
  the 
  footprints, 
  produced 
  probably 
  by 
  a 
  keel-shaped 
  ster- 
  

   num. 
  The 
  surfaces 
  of 
  the 
  sandstones 
  south-west 
  of 
  Tarbetness, 
  at 
  

   Cambus-Shandwick 
  and 
  Portmahomack, 
  have 
  other 
  impressions 
  

  

  