﻿172 
  T. 
  P. 
  JAMIES0N 
  ON 
  THE 
  RED 
  CLAY 
  

  

  elsewhere 
  ; 
  and 
  as 
  it 
  is 
  a 
  deposit 
  of 
  still 
  water, 
  the 
  probability 
  is 
  

   that 
  the 
  summit 
  of 
  these 
  eminences 
  lay 
  so 
  deep 
  as 
  to 
  be 
  beyond 
  the 
  

   agitation 
  of 
  surface 
  waves. 
  On 
  the 
  southern 
  slope 
  of 
  the 
  Hill 
  of 
  

   Dudwick 
  in 
  the 
  same 
  neighbourhood 
  there 
  is 
  a 
  bed 
  of 
  hard 
  reddish- 
  

   brown 
  or 
  ferruginous 
  -coloured 
  clay, 
  containing 
  small 
  stones, 
  which 
  

   covers 
  the 
  quartzite 
  of 
  that 
  hill 
  and 
  thins 
  out 
  on 
  the 
  brow 
  of 
  the 
  

   eminence 
  at 
  an 
  altitude 
  of 
  500 
  feet 
  or 
  a 
  little 
  more. 
  This 
  coarse 
  

   clay 
  may 
  very 
  possibly 
  have 
  been 
  derived 
  from 
  the 
  same 
  deposit 
  as 
  

   the 
  finer 
  red 
  clay 
  at 
  lower 
  levels; 
  but 
  of 
  this 
  I 
  cannot 
  be 
  certain. 
  

  

  In 
  this 
  eastern 
  part 
  of 
  Aberdeenshire 
  there 
  are 
  some 
  shoals 
  of 
  

   waterworn 
  pebbles 
  of 
  quartz 
  and 
  flint 
  on 
  the 
  tops 
  of 
  hills 
  at 
  heights 
  

   of 
  from 
  350 
  to 
  470 
  feet, 
  unlike 
  any 
  thing 
  I 
  have 
  met 
  with 
  in 
  other 
  

   parts 
  of 
  Scotland. 
  Some 
  account 
  of 
  them 
  will 
  be 
  found 
  in 
  the 
  Quart. 
  

   Journ. 
  Geol. 
  Soc. 
  Nov. 
  1858, 
  vol. 
  xiv. 
  p. 
  528. 
  The 
  pebbles 
  are 
  

   intensely 
  water-rolled, 
  like 
  those 
  of 
  a 
  beach, 
  as 
  if 
  they 
  had 
  been 
  

   exposed 
  to 
  the 
  action 
  of 
  waves 
  in 
  shoal 
  water 
  ; 
  they 
  do 
  not 
  seem 
  

   to 
  be 
  moraine 
  gravels 
  ; 
  and 
  in 
  one 
  place 
  I 
  got 
  fragments 
  of 
  sea-shells 
  

   at 
  an 
  altitude 
  of 
  about 
  300 
  feet. 
  This 
  was 
  in 
  a 
  bed 
  of 
  smaller 
  

   gravel 
  forming 
  the 
  crest 
  of 
  an 
  eminence 
  356 
  feet 
  above 
  the 
  sea, 
  

   called 
  the 
  Hill 
  of 
  Auchleuchries. 
  It 
  lies 
  quite 
  near 
  to 
  Dudwick, 
  

   and 
  is 
  20 
  miles 
  to 
  the 
  north 
  of 
  Aberdeen 
  and 
  7 
  miles 
  from 
  the 
  

   coast. 
  The 
  species 
  found 
  were 
  :— 
  Astarte 
  borealis, 
  several 
  fragments 
  ; 
  

   A. 
  elliptica 
  (?), 
  fragment, 
  but 
  rather 
  imperfect 
  for 
  fair 
  determination 
  ; 
  

   Buccinumundatum^.), 
  fragments 
  of 
  the 
  spire 
  of 
  a 
  good-sized 
  univalve, 
  

   probably 
  this 
  species 
  ; 
  Cardium, 
  2 
  pieces, 
  apparently 
  C. 
  echinatum 
  ; 
  

   Cyprina 
  islandica, 
  a 
  great 
  many 
  fragments: 
  Mactra 
  elliptica, 
  a 
  

   hinge-fragment; 
  Murex 
  erinaceus, 
  one 
  specimen, 
  nearly 
  perfect, 
  

   but 
  a 
  good 
  deal 
  worn, 
  length 
  J 
  inch 
  ; 
  JS 
  T 
  assa 
  incrassata, 
  one 
  

   specimen, 
  nearly 
  whole 
  ; 
  Purpura 
  lapillus, 
  two 
  specimens 
  nearly 
  

   entire 
  and 
  a 
  fragment 
  of 
  another 
  ; 
  some 
  fragments 
  of 
  Saxicava 
  

   rugosa 
  and 
  Tellina 
  balthica; 
  Tellina 
  calcarea, 
  some 
  fragments 
  

   apparently 
  of 
  this 
  species, 
  but 
  too 
  imperfect 
  for 
  certainty 
  ; 
  Trophon 
  

   clathratus, 
  one 
  small 
  specimen, 
  imperfect; 
  Turritella 
  terebra, 
  one 
  

   fragment. 
  

  

  It 
  is 
  rather 
  singular 
  to 
  find 
  Murex 
  erinaceus 
  here, 
  the 
  only 
  

   other 
  instance 
  of 
  its 
  occurrence 
  in 
  the 
  glacial 
  beds 
  of 
  Scotland, 
  so 
  

   far 
  as 
  I 
  am 
  aware, 
  being 
  at 
  Dalmuir 
  in 
  the 
  Clyde 
  district. 
  It 
  

   occurs, 
  however, 
  on 
  Moel 
  Tryfan. 
  

  

  Although 
  these 
  shoals 
  of 
  waterworn 
  pebbles 
  have 
  not 
  been 
  observed 
  

   by 
  me 
  above 
  an 
  altitude 
  of 
  about 
  470 
  feet, 
  yet 
  over 
  the 
  top 
  of 
  the 
  

   Hill 
  of 
  Dudwick 
  a 
  few 
  of 
  the 
  very 
  same 
  waterworn 
  pebbles 
  of 
  quartz 
  

   and 
  flint 
  occur 
  scattered 
  here 
  and 
  there 
  up 
  to 
  a 
  height 
  of 
  560 
  feet 
  ; 
  

   and 
  some 
  of 
  these 
  show 
  marks 
  of 
  glacial 
  action 
  which 
  must 
  have 
  

   been 
  imprinted 
  on 
  them 
  after 
  they 
  were 
  water-rolled. 
  The 
  probability, 
  

   therefore, 
  is 
  that 
  the 
  shingle 
  beds 
  had 
  originally 
  ranged 
  up 
  to 
  the 
  

   top 
  of 
  tHis 
  hill, 
  but 
  had 
  been 
  subsequently 
  removed 
  by 
  glacial 
  action. 
  

   This 
  would 
  bring 
  the 
  submergence 
  to 
  at 
  least 
  560 
  feet, 
  beyond 
  which 
  

   the 
  evidence 
  fails 
  us. 
  

  

  Quite 
  recently 
  a 
  small 
  denuded 
  patch 
  of 
  fine 
  silt 
  containing 
  

   shallow-water 
  shells 
  in 
  situ 
  has 
  been 
  found 
  by 
  Mr. 
  James 
  Fraser. 
  

  

  