90 
PROF.  T.  G.  BONNET  ON  THE 
[Feb.  1893, 
layers.  The  mass  clearly  was  broken  up,  but  as  the  stratified 
structure  lay  generally  at  low  angles  we  were  at  first  uncertain 
whether  some  of  it  might  not  be  in  place.  But  we  were  ultimately 
satisfied  that  it  was  a  great  bergfcdl  from  the  Nufenenstock,  and, 
on  looking  down  from  the  flanks  of  that  peak,  saw  that  we  were 
right.  So  soon  as  we  had  practically  joined  on  to  our  former  work, 
we  began  to  climb  the  Nufenenstock,  the  summit  of  which  is  about 
1400  feet  higher  than  the  ‘  corridor.’  We  went  up  the  northern 
face,  making  as  straight  a  course  for  the  summit  as  circumstances 
permitted,  and  descended  by  the  southern  face,  bearing  westwards 
after  a  time,  so  as  to  cross  the  watershed  between  the  Yal  Corno 
and  the  Gries  Glacier.  From  this  we  struck  down  to  the  track 
from  the  Gries  Pass  and  followed  it  till  we  reached  the  spot  where 
we  had  branched  off  from  it  in  the  morning  :  by  this  means  running 
two  sections  across  the  general  strike  of  the  strata  (roughly  E.N.E.) 
at  a  distance  for  the  most  part  of  a  good  half-mile. 
We  mounted  first  by  a  steep  slope  of  screes,  where  we  identified 
dark-mica,  black-garnet,  and  disthene-schists,  with  rauchwacke  and 
4  spotted  ’  Jurassic  rock,1  indicating  that  all  these  occur  higher  up 
on  the  peak.  We  then  climbed  crags  with  intervening  snow-slopes  : 
the  former  consisted  for  a  time  of  the  first  and  second  schists,  with 
a  thin  bed  of  disthene-schist  in  the  lower  parts  of  the  mass,  followed 
by  a  little  rauchwacke,2  but  we  presently  reached  outcrops  of  the 
‘spotted’  Jurassic,  with  the  usual  hard,  brown,  sandy  bands  in  places ; 
above  another  slope  came  some  more  crags  of  the  ‘  spotted  ’  rock,! 
but  the  final  ascent  is  over  dark-mica  and  black-garnet  schists. 
The  same  dark  schists  continue  down  the  southern  face  of  the 
peak  :  black  garnets  often  being  plentiful,  and  the  quart zose  layers 
occurring  as  usual.  We  worked,  as  stated,  rather  to  the  west ;  till, 
on  approaching  the  watershed  between  the  Yal  Corno  and  the  Gries 
Glacier,  we  crossed  a  band  of  disthene-schist,  only  a  few  feet  thick, 
and  shortly  afterwards  reached  a  mass  of  rauchwacke  which  had  been 
conspicuous  from  the  summit.  It  lies  north  of  the  lowest  point  of 
the  watershed.  We  then  descended  a  shallow  ravine,  which  runs 
nearly  with  the  strike  of  this  rock,  till  we  approached  the  right  bank 
of  the  ice-stream  of  the  Gries  Glacier,  when  we  got  back  on  to  the 
black-garnet  schists  and  presently  struck  into  the  path  from  the 
Gries  Pass.  The  last-named  rock  continued  for  a  considerable  dis¬ 
tance  ;  then  came  disthene-schists  (about  a  dozen  yards  across  at  the 
outcrop  and  nearly  vertical),  which  were  followed  by  a  couple  of 
1  Namely,  as  shown  in  the  former  paper,  that  containing  belemnites  with 
lcnoten  and  pri'smen,  which  have  been  (as  there  proved)  wrongly  identified  with 
garnets  and  staurolites. 
2  Both  imperfectly  exposed  among  screes,  so  that  I  am  not  quite  certain 
that  even  these  are  in  place. 
3  Here  was  a  bit  of  bad  climbing  where  the  rope  was  necessary,  and  I  was 
thankful  for  the  aid  of  a  first-class  guide  (Michel  Payot,  the  constant  helper 
and  companion  of  Mr.  Eccles’s  photographic  and  geological,  as  well  as  oi  his 
serious  mountain  expeditions).  There  is  no  other  difficulty  in  the  ascent ;  on 
the  descent  any  one  can  go.  I  think  a  crag-climber  would  not  maintain  the 
identity  of  the  ‘  spotted  ’  Jurassic  rock  and  the  black-garnet  schist.  The  former 
is  scaly,  treacherous  stuff,  with  no  good  ledges,  the  latter  firm  and  trustworthy. 
