﻿1864.] 
  YOUNG 
  GLACIERS. 
  459 
  

  

  sections, 
  contrasting 
  strongly 
  with 
  the 
  Boulder-clay, 
  also 
  well 
  ex- 
  

   posed 
  in 
  adjoining 
  burns. 
  At 
  one 
  point 
  west 
  of 
  the 
  bend 
  in 
  Talla 
  

   Water, 
  there 
  is 
  seen, 
  beneath 
  the 
  loose 
  sandy 
  clay 
  and 
  angular 
  

   gravel 
  of 
  the 
  mounds, 
  a 
  hard 
  stony 
  drab 
  clay. 
  Its 
  density, 
  diagonal 
  

   jointing 
  (resembling 
  the 
  pseudo-stratifications 
  of 
  the 
  Till), 
  the 
  com- 
  

   minution 
  of 
  its 
  materials, 
  and 
  the 
  presence 
  of 
  scratched 
  stones 
  

   suggest 
  that 
  it 
  has 
  been 
  subjected 
  to 
  pressure, 
  and 
  recall 
  the 
  descrip- 
  

   tion 
  of 
  the 
  Moraine 
  Profonde 
  given 
  by 
  Hogard 
  in 
  his 
  Terrain 
  Erratique 
  

   des 
  Vosges. 
  The 
  scratched 
  stones 
  have 
  not 
  the 
  uniform 
  rounding, 
  

   fine 
  polish, 
  and 
  parallel 
  longitudinal 
  striation 
  characteristic 
  of 
  Till 
  ; 
  

   on 
  the 
  contrary, 
  they 
  are 
  mostly 
  angular, 
  and 
  smoothed 
  only 
  on 
  one 
  

   surface, 
  on 
  which 
  the 
  striae 
  are 
  short, 
  imperfect, 
  and 
  often 
  decussating. 
  

   Where 
  stratified 
  nests 
  of 
  sand 
  occur, 
  they 
  are 
  invariably 
  overlain 
  by 
  

   gravel, 
  and 
  seem 
  therefore 
  due 
  to 
  percolation, 
  which 
  has 
  removed 
  

   the 
  finer 
  materials 
  to 
  a 
  lower 
  level, 
  leaving 
  the 
  larger 
  fragments. 
  

  

  The 
  top 
  of 
  Wood 
  Brae 
  is 
  traversed 
  by 
  a 
  series 
  of 
  rock-mouldings 
  

   curving 
  from 
  Talla 
  parallel 
  to 
  Megget 
  Valley, 
  and 
  ending 
  in 
  the 
  

   recess 
  from 
  which 
  Kitties 
  Burn 
  flows. 
  The 
  section 
  in 
  that 
  burn 
  is 
  

   through 
  rudely 
  stratified 
  Boulder-clay, 
  and 
  exposes 
  the 
  moraine- 
  

   matter 
  resting 
  against 
  the 
  clay 
  near 
  the 
  foot 
  of 
  the 
  hill. 
  Huge 
  

   blocks 
  from 
  this 
  clay 
  strew 
  the 
  burn- 
  course 
  ; 
  they 
  are 
  all 
  rounded 
  

   on 
  the 
  margin, 
  polished 
  and 
  scored 
  on 
  all 
  sides, 
  the 
  striae 
  running 
  

   parallel 
  from 
  end 
  to 
  end 
  of 
  a 
  surface 
  more 
  than 
  3 
  feet 
  in 
  length. 
  

   This 
  is 
  the 
  end 
  of 
  the 
  deposit 
  which, 
  varying 
  in 
  thickness 
  and 
  

   extent, 
  lies 
  on 
  both 
  sides 
  of 
  the 
  valley 
  up 
  to 
  Loch 
  Skene, 
  being 
  

   evidently 
  the 
  wreck 
  of 
  the 
  mass 
  which 
  probably 
  filled 
  the 
  valley 
  

   until 
  the 
  last 
  glacier 
  wore 
  a 
  passage 
  through 
  it 
  down 
  to 
  the 
  present 
  

   level. 
  The 
  recess 
  between 
  Pan's 
  Law 
  and 
  Wylie's 
  Brae 
  is 
  similarly 
  

   filled 
  with 
  Boulder-clay, 
  which 
  also 
  clothes 
  the 
  slope 
  and 
  fills 
  the 
  

   small 
  burn 
  between 
  Upper 
  Talla 
  and 
  Carlavin, 
  and 
  on 
  the 
  face 
  of 
  

   that 
  hill 
  there 
  are 
  also 
  straggling 
  patches 
  in 
  nooks 
  above 
  the 
  mo- 
  

   raine-detritus. 
  

  

  In 
  a 
  depression 
  south 
  of 
  Firthoperig 
  lies 
  the 
  source 
  of 
  Gameshope 
  

   Burn. 
  A 
  low 
  lip 
  of 
  rock 
  separates 
  the 
  peat-moss 
  whence 
  it 
  flows 
  

   from 
  the 
  craggy 
  head 
  of 
  Corrifran. 
  The 
  first 
  part 
  of 
  its 
  course 
  is 
  

   through 
  a 
  straight 
  valley 
  covered 
  with 
  a 
  thin 
  layer 
  of 
  detritus, 
  

   extending 
  a 
  short 
  way 
  up 
  the 
  slopes 
  on 
  either 
  side, 
  which 
  show 
  

   roches 
  moutonnees 
  wherever 
  the 
  grits 
  are 
  exposed. 
  About 
  a 
  mile 
  

   down 
  stream 
  the 
  detritus 
  spreads 
  out 
  to 
  the 
  left, 
  and 
  may 
  be 
  traced 
  

   up 
  to 
  a 
  small 
  loch 
  which, 
  surrounded 
  on 
  the 
  south 
  and 
  west 
  by 
  

   Boulder-clay, 
  and 
  on 
  the 
  north 
  by 
  grits, 
  is 
  closed 
  to 
  the 
  east 
  by 
  

   moraine 
  -matter. 
  Lying 
  high 
  above 
  the 
  stream, 
  it 
  seems 
  a 
  lake 
  

   formed 
  in 
  a 
  lateral 
  valley 
  by 
  the 
  passage 
  of 
  a 
  glacier 
  which 
  has 
  

   shed 
  a 
  lateral 
  moraine 
  across 
  its 
  mouth. 
  Below 
  the 
  loch 
  the 
  stream 
  

   bends 
  to 
  the 
  east. 
  The 
  glacier 
  has 
  ground 
  this 
  part 
  of 
  its 
  course 
  

   through 
  Boulder-clay, 
  which 
  lies 
  thick 
  on 
  the 
  left 
  bank, 
  the 
  scarps 
  and 
  

   rills 
  giving 
  cross 
  sections 
  of 
  moraine-matter 
  resting 
  against 
  the 
  clay; 
  

   on 
  the 
  right 
  side 
  the 
  detritus 
  lies 
  on 
  the 
  grits 
  of 
  Great 
  Hill. 
  Between 
  

   this 
  hill 
  and 
  Firthy 
  Brig 
  Head 
  lies 
  a 
  wide 
  funnel-shaped 
  valley. 
  

   In 
  the 
  gorge 
  to 
  which 
  it 
  contracts 
  there 
  are 
  a 
  few 
  mounds 
  of 
  detritus, 
  

  

  