﻿164 
  

  

  T. 
  F. 
  JAMIES0N 
  ON 
  THE 
  KED 
  CLAY 
  

  

  ever, 
  occasionally 
  from 
  S. 
  50° 
  to 
  80° 
  W., 
  while 
  the 
  rubbed 
  surface 
  

   of 
  the 
  granite 
  shows 
  plainly 
  that 
  the 
  ice 
  has 
  come 
  from 
  the 
  west- 
  

   ward 
  and 
  not 
  from 
  the 
  east. 
  Where 
  the 
  grey 
  stuff 
  is 
  absent 
  and 
  

   the 
  red 
  clay 
  lies 
  next 
  the 
  rock 
  the 
  direction 
  of 
  the 
  grooves 
  is 
  about 
  

   S. 
  10° 
  W. 
  or 
  60° 
  further 
  south 
  than 
  the 
  older 
  set, 
  and 
  the 
  action 
  on 
  

   the 
  surface 
  of 
  the 
  rock 
  seems 
  to 
  show 
  that 
  the 
  moving 
  agent 
  had 
  

   come 
  from 
  the 
  south 
  and 
  not 
  from 
  the 
  north. 
  

  

  The 
  accompanying 
  section 
  (fig. 
  2) 
  will 
  give 
  some 
  idea 
  of 
  the 
  

   arrangement 
  of 
  the 
  Boulder- 
  clays. 
  

  

  Fig. 
  2. 
  — 
  Section 
  at 
  Cove 
  Quarry. 
  

  

  a. 
  Eed 
  Boulder-clay, 
  4-6 
  feet 
  thick. 
  

  

  b. 
  Grey 
  Boulder-clay, 
  1-3 
  feet 
  thick 
  . 
  

  

  c. 
  Granite. 
  

  

  This 
  interesting 
  locality 
  proves 
  that 
  there 
  has 
  been 
  a 
  change 
  in 
  

   the 
  direction 
  of 
  the 
  ice-flow 
  : 
  the 
  older 
  stream 
  has 
  come 
  from 
  the 
  

   interior 
  of 
  the 
  country 
  to 
  the 
  W.S.W., 
  parallel 
  to 
  the 
  strike 
  of 
  the 
  

   valley 
  of 
  the 
  Dee, 
  bringing 
  with 
  it 
  the 
  grey 
  debris 
  of 
  gneiss 
  and 
  

   granite 
  ; 
  whereas 
  the 
  later 
  stream 
  has 
  come 
  nearly 
  from 
  the 
  south, 
  

   or 
  parallel 
  to 
  the 
  line 
  of 
  coast. 
  This 
  change 
  has 
  brought 
  with 
  it 
  the 
  

   red 
  material 
  from 
  the 
  sandstone 
  district 
  of 
  Kincardineshire 
  ; 
  and 
  in 
  

   following 
  the 
  coast 
  north 
  from 
  Stonehaven 
  I 
  observed 
  that 
  the 
  red 
  

   Boulder-clay 
  of 
  that 
  locality 
  extended 
  past 
  the 
  boundary 
  of 
  the 
  Old 
  

   Eed 
  Sandstone 
  on 
  to 
  the 
  gneiss 
  rocks 
  which 
  range 
  along 
  the 
  coast 
  

   northward 
  to 
  Aberdeen 
  ; 
  and 
  I 
  have 
  traced 
  this 
  red 
  Boulder-clay, 
  

   full 
  of 
  Old 
  Eed 
  Sandstone 
  debris 
  along 
  the 
  coast 
  of 
  Kincardineshire 
  

   to 
  within 
  a 
  mile 
  of 
  the 
  town 
  of 
  Aberdeen. 
  

  

  More 
  recently 
  I 
  have 
  found 
  evidence 
  to 
  show 
  that 
  this 
  movement 
  

   of 
  the 
  ice 
  extended 
  not 
  only 
  to 
  Aberdeen, 
  but 
  continued 
  along 
  

   the 
  coast 
  on 
  to 
  the 
  Buchan 
  Ness, 
  a 
  rocky 
  headland 
  beside 
  Peterhead, 
  

   forming 
  the 
  most 
  easterly 
  point 
  of 
  the 
  Scottish 
  coast. 
  

  

  There 
  are 
  several 
  granite 
  -quarries 
  in 
  that 
  neighbourhood 
  ; 
  but 
  the 
  

   rock 
  has 
  generally 
  little 
  cover 
  ; 
  and 
  it 
  is 
  only 
  where 
  the 
  surface 
  of 
  

   the 
  granite 
  has 
  been 
  protected 
  by 
  a 
  covering 
  of 
  clay 
  that 
  the 
  glacia- 
  

   tion 
  is 
  likely 
  to 
  be 
  preserved. 
  The 
  best 
  instances 
  I 
  discovered 
  were 
  

   at 
  a 
  quarry 
  on 
  the 
  top 
  of 
  a 
  high 
  rocky 
  cliff 
  called 
  Mordow 
  Head 
  or 
  

   Murdoch 
  Head. 
  Here 
  there 
  are 
  from 
  three 
  to 
  five 
  feet 
  of 
  unstratified 
  

   reddish 
  pebbly 
  clay 
  covering 
  the 
  rock. 
  This 
  clay 
  is 
  quite 
  full 
  of 
  the 
  

   quartz 
  pebbles 
  from 
  the 
  Old 
  Eed 
  Conglomerate 
  and 
  pieces 
  of 
  volcanic 
  

   rocks. 
  Where 
  it 
  has 
  been 
  recently 
  removed, 
  the 
  surface 
  of 
  the 
  granite 
  

   beneath 
  shows 
  clear 
  marks 
  of 
  glaciation. 
  The 
  striae 
  point 
  S. 
  20° 
  to 
  

   30° 
  W., 
  which 
  is 
  about 
  parallel 
  to 
  the 
  general 
  trend 
  of 
  the 
  coast- 
  

   line 
  to 
  the 
  south 
  of 
  this 
  point 
  ; 
  and, 
  so 
  far 
  as 
  I 
  could 
  judge, 
  the 
  action 
  

   had 
  come 
  from 
  the 
  S.W. 
  and 
  not 
  from 
  the 
  N.E. 
  

  

  