﻿Vol. 
  53-] 
  

  

  THE 
  SUMMIT 
  OF 
  THE 
  ET7RKA 
  PASS. 
  

  

  17 
  

  

  Jurassic 
  limestones. 
  Thus 
  I 
  believe 
  that 
  the 
  opinion 
  expressed 
  in 
  

   my 
  former 
  paper, 
  as 
  to 
  a 
  recurrence 
  of 
  the 
  marble, 
  is 
  correct. 
  

   I 
  was 
  not, 
  however, 
  able 
  to 
  trace 
  this 
  second 
  mass 
  farther 
  west. 
  

   The 
  very 
  rough 
  diagram 
  appended 
  (fig. 
  1), 
  a 
  reproduction 
  of 
  one 
  

  

  1 
  = 
  Jurassic. 
  

  

  2 
  = 
  (Probably) 
  crushed 
  marble. 
  

  

  3 
  = 
  Small 
  patch, 
  probably 
  crushed 
  

  

  marble. 
  

  

  Quite 
  typical 
  Jurassic 
  : 
  12 
  to 
  

  

  15 
  feet 
  exposed. 
  

   Marble 
  (end 
  of 
  crag 
  by 
  road). 
  

   Road. 
  

  

  [Intervening 
  spaces 
  mostly 
  turf-covered. 
  Bock, 
  if 
  any 
  visible, 
  Jurassic] 
  

  

  -drawn 
  in 
  my 
  note-book 
  to 
  indicate 
  the 
  general 
  relation 
  of 
  the 
  rocks 
  

   on 
  the 
  western 
  side 
  of 
  the 
  top 
  of 
  the 
  pass, 
  may 
  make 
  the 
  matter 
  

   clearer 
  than 
  copies 
  of 
  more 
  detailed 
  sections. 
  Next 
  comes 
  more 
  

   limestone, 
  grey 
  or 
  dark 
  blue 
  in 
  colour, 
  in 
  one 
  place 
  having 
  some 
  

   sandy 
  bands, 
  in 
  another 
  becoming 
  clayey. 
  The 
  details, 
  however, 
  

   are 
  without 
  interest, 
  and 
  the 
  rock 
  is 
  undoubtedly 
  Jurassic. 
  Lastly, 
  

   we 
  found 
  a 
  pale-grey 
  porphyritic 
  gneissoid 
  rock, 
  with 
  indications 
  

   of 
  having 
  been 
  crushed 
  ; 
  not 
  improbably 
  a 
  modified 
  granite. 
  It 
  

   belongs, 
  however, 
  to 
  the 
  crystalline 
  series 
  of 
  this 
  part 
  of 
  the 
  Alps, 
  

   and 
  is 
  much 
  older 
  than 
  the 
  Jurassic 
  period. 
  So 
  far 
  as 
  one 
  can 
  

   judge, 
  the 
  succession, 
  which 
  we 
  observe 
  close 
  to 
  the 
  top 
  of 
  the 
  pass, 
  1 
  

   continues 
  towards 
  the 
  west, 
  except 
  that 
  the 
  upper 
  bed 
  of 
  marble 
  seems 
  

   to 
  disappear. 
  The 
  lower 
  and 
  larger 
  mass 
  is 
  masked, 
  after 
  passing 
  

   beneath 
  the 
  road, 
  by 
  turf 
  and 
  talus, 
  and, 
  so 
  far 
  as 
  I 
  could 
  see, 
  does 
  

   not 
  reappear. 
  It 
  is 
  not 
  indicated 
  on 
  the 
  maps, 
  and 
  I 
  think 
  no 
  

   conspicuous 
  outcrop 
  occurs 
  on 
  the 
  slopes 
  of 
  the 
  glen 
  west 
  of 
  the 
  

   pass. 
  2 
  The 
  dip 
  of 
  the 
  above-mentioned 
  rocks 
  is 
  variable 
  in 
  amount 
  

   and 
  in 
  direction, 
  but 
  something 
  like 
  45° 
  for 
  the 
  one 
  and 
  W.N.W. 
  

   for 
  the 
  other 
  may 
  serve 
  as 
  a 
  rough 
  approximation. 
  The 
  marble 
  at 
  

   the 
  top 
  of 
  the 
  pass 
  was 
  more 
  steeply 
  inclined, 
  having 
  a 
  dip 
  nearer 
  

   70° 
  ; 
  this, 
  so 
  far 
  as 
  I 
  remember, 
  was, 
  however, 
  rather 
  exceptionally 
  

   high. 
  

  

  1 
  Op. 
  cit. 
  p. 
  295, 
  cf. 
  fig. 
  3. 
  

  

  2 
  The 
  slopes 
  are 
  steep 
  and 
  grassy, 
  and 
  exposures 
  of 
  rock 
  mostly 
  small. 
  I 
  

   found 
  at 
  one 
  place 
  about 
  1400 
  feet 
  above 
  the 
  Ehone 
  Glacier 
  Hotel 
  a 
  very 
  small 
  

   outcrop 
  which 
  might 
  possibly 
  represent 
  the 
  marble 
  in 
  a 
  greatly 
  crushed 
  condition. 
  

   But 
  in 
  this 
  part 
  I 
  have 
  not 
  attempted 
  to 
  make 
  a 
  minute 
  examination. 
  

  

  Q. 
  J. 
  G. 
  S. 
  No. 
  209. 
  c 
  

  

  