﻿CRYSTALLINE 
  ROCKS 
  OF 
  THE 
  ALPS. 
  

  

  91 
  

  

  (S) 
  Mittersill 
  to 
  Kitzbuhel. 
  

  

  Prom 
  Mittersill 
  a 
  good 
  carriage-road 
  ascends 
  the 
  mountain-slopes 
  

   forming 
  the 
  north 
  bank 
  of 
  the 
  Salza, 
  passing 
  a 
  picturesque 
  castle, 
  

   which 
  is 
  perched 
  on 
  a 
  prominent 
  knoll. 
  By 
  its 
  side 
  excellent 
  sections 
  

   are 
  exposed 
  in 
  artificial 
  scarps. 
  The 
  first 
  rock 
  seen 
  is 
  lead-coloured 
  

   " 
  Thonglimmerschiefer" 
  exactly 
  like 
  that 
  of 
  the 
  Pusterthal 
  district, 
  

   but 
  with 
  a 
  cleavage-foliation 
  so 
  strongly 
  marked 
  that 
  it 
  masks 
  every 
  

   other 
  structure, 
  and 
  generally 
  renders 
  the 
  rock 
  so 
  fissile 
  that 
  it 
  is 
  

   almost 
  impossible 
  to 
  obtain 
  specimens. 
  The 
  structure 
  dips 
  at 
  a 
  high 
  

   angle 
  (about 
  70°) 
  north, 
  or 
  a 
  little 
  east 
  of 
  north. 
  Bedding, 
  however, 
  

   is 
  occasionally 
  suggested 
  by 
  changes 
  in 
  the 
  tint 
  of 
  masses. 
  But 
  pre- 
  

   sently, 
  as 
  the 
  road 
  sweeps 
  round 
  a 
  little 
  knoll 
  below 
  the 
  castle, 
  a 
  small 
  

   quarry 
  exhibits 
  a 
  more 
  interesting 
  section 
  (fig. 
  7). 
  At 
  the 
  lower 
  

  

  Fig. 
  7. 
  — 
  Quarry 
  below 
  Castle 
  near 
  Mittersill. 
  

   (Total 
  length 
  of 
  section 
  about 
  24 
  yards.) 
  

  

  A 
  B 
  

  

  A. 
  Fissile 
  Thonglimmerscheifer. 
  

  

  c 
  

  

  B. 
  Calomica- 
  schist. 
  

  

  0. 
  Marble. 
  

  

  end 
  it 
  is 
  limited 
  by 
  a 
  very 
  fissile 
  " 
  Thonglimmerschiefer 
  ■." 
  This 
  passes 
  

   rather 
  rapidly 
  into 
  calc-mica-schist, 
  and 
  this, 
  again, 
  similarly 
  changes 
  

   into 
  a 
  banded 
  crystalline 
  limestone, 
  which 
  soon 
  becomes 
  quite 
  

   massive, 
  and 
  so 
  continues 
  for 
  the 
  remainder 
  of 
  the 
  exposure, 
  except 
  

   that 
  there 
  are 
  some 
  very 
  dubious 
  indications 
  of 
  bedding 
  at 
  the 
  

   upper 
  end 
  of 
  the 
  quarry. 
  The 
  strike 
  of 
  the 
  cleavage-foliation 
  at 
  the 
  

   lower 
  part 
  of 
  the 
  quarry 
  is 
  a 
  little 
  N. 
  of 
  W., 
  with 
  a 
  high 
  dip 
  on 
  the 
  

   northern 
  side. 
  This 
  structure 
  is 
  generally 
  coincident 
  with 
  the 
  

   stratification-foliation 
  and 
  with 
  the 
  apparent 
  bedding 
  exhibited 
  by 
  

   the 
  neighbouring 
  calcareous 
  rock, 
  but 
  the 
  dip 
  appears 
  to 
  become 
  less 
  

   steep 
  towards 
  the 
  upper 
  end 
  of 
  the 
  quarry. 
  This 
  marble 
  forms 
  the 
  

   ridge 
  on 
  which 
  the 
  castle 
  stands, 
  and 
  the 
  road, 
  which 
  mounts 
  gradu- 
  

   ally 
  in 
  a 
  westerly 
  direction, 
  leaves 
  it 
  on 
  the 
  southern 
  side 
  and 
  crosses 
  

   varieties 
  of 
  the 
  " 
  Thonglimmerschiefer" 
  one 
  being 
  a 
  quartzose 
  schist, 
  

   like 
  that 
  in 
  the 
  quarry 
  near 
  Brunecken. 
  Fine 
  sections 
  are 
  exposed 
  in 
  

   a 
  lateral 
  ravine 
  some 
  distance 
  further 
  to 
  the 
  west, 
  and 
  higher 
  up 
  the 
  

   slope, 
  masses 
  of 
  marble 
  or 
  calc-mica-schist 
  (the 
  rock 
  varies 
  from 
  the 
  

   one 
  to 
  the 
  other) 
  being 
  distinctly 
  interstratified 
  with 
  the 
  typical 
  

   "Thonglimmerschiefer." 
  Here, 
  in 
  places, 
  the 
  cleavage-foliation 
  is 
  seen 
  

   to 
  cut 
  the 
  stratification-foliation 
  at 
  various 
  angles. 
  In 
  the 
  " 
  Thon- 
  

   glimmerschiefer" 
  are 
  harder 
  (? 
  quartzose) 
  bands, 
  which 
  sometimes 
  are 
  

  

  