62 
MISS  OGILVIE  OH  THE  WENGEH  AND 
[Feb.  1893, 
volcanic  agglomerates  exposed  higher  on  the  Pass.  The  whole 
system  on"  the  Pass  belongs  to  the  northern  wing  of  the  Yarda 
fault ;  augite-porphyry  forms  the  southern  wing,  and  is  present 
below  the  exposure  of  W erfen  Beds  in  the  stream  which  flows 
towards  Arabba.  The  Buchenstein  anticline  is  therefore  broken 
north  of  Arabba  by  an  east-and-west  fault  of  reversed  hade.  I  did 
not  follow  the  eastward  continuation  of  this  Yarda  fault,  but  at 
Cherz  I  observed  that  the  succession  from  the  Werfen  to  the  Y  engen 
Beds  was  conformable.  The  latter  are  exposed  on  a  wide  hilly 
upland  between  Cherz  and  the  Incisa  Bach  ;  again,  descending  along 
the  Incisa  Bach  towards  Corvara,  they  are  found  in  complete  suc¬ 
cession,  resting  upon  the  augite-porphyry  near  Corvara  (see  fig.  1, 
p.  17).  This  whole  system  meets  (along  the  transverse  fault  west 
of  Campolungo)  the  system  of  W  engen  and  St.  Cassian  strata  which 
underlie  Sella.  Close  under  the  rocky  wall  of  the  Sella  massif 
several  small  faults  occur;  Dachstein  Dolomite  and  Baibl  strata 
are  faulted  down  against  St.  Cassian  strata ;  sometimes,  again, 
the  Schlern.  Dolomite  remains  in  considerable  thickness  above  the 
St.  Cassian  Beds.  .  / 
North  of  Monte  Cherz  the  Prelongei  succession  is  exposed  (see 
fig.  2,  p.  19)  ;  in  this  the  St.  Cassian  strata  are  predominant.  A 
fmilt  of  small  throw  runs  from  the  north-west  at  the  Incisa  Bach 
towards  the  south-east.  Although  this  fault  can  be  easily  traced 
towards  Corvara,  it  is  difficult  to  follow  it  through  the  meadows  of 
the  Selvaza  Bach,  partly  owing  to  the  presence  of  slipped  debris, 
and  partly  because  its  course  here  is  only  through  different  horizons 
of  Wengen  Beds.  It  apparently  meets  the  (east-and-west)  Monte 
Sief  fault  near  Cherz,  and  the  Prelongei  succession  north  of  it  is 
slightly  let  down. 
That  succession,  which  occupies  the  central  portion  ot  Map  A, 
is  cut  off  eastward  towards  Sett  Sass  by  the  north-and-south 
fault  against  the  Dachstein  Dolomite ;  southward  by  the  Monte 
Sief-Cherz  fault  and  the  Cherz-Incisa  Bach  fault  against  the  Wengen 
Beds  ;  north-westward  and  northward  by  the  fault  from  the  Groden 
Pass/  Another  fault  runs  parallel  with  the  Groden  Pass-and- 
Prelongei  fault,  and  north  of  it ;  between  them,  on  Langs-da-fiir, 
the  older  strata,  from  the  Werfen  to  the  Wengen  Beds,  are  ex¬ 
posed.  This  is  the  southern  wing  of  the  Groden  Pass  anticlinal 
fold  ;  the  northern  wing  is  cutout  here,  but  is  exposed  farther  west 
and  'faulted  against  the  Gardenazza  massif  at  Sass  Songe,  north 
of  Colfuschg. 
The  main  strike  of  the  Langs-da-fiir  system  is  south-west  and 
north-east,  and  the  strata  dip  south-east.  On  the  northern  slope 
(towards  the  confluence  of  the  Grosser  Bach  and  the  Sore  Bach)  the 
Langs-da-fiir  system  is  faulted  against  Wengen  Beds,  which  form 
part  of  the  system  of  Wengen  and  St.  Cassian  Beds  exposed  on  both 
sides  of  the  Gader  Bach  (see  fig.  4,  p.  26). 
Near  St.  Cassian  the  Werfen  Beds  and  the  Muschelkalk  are  again 
cut  off  against  younger  strata  by  a  minor  east-and-west  fault. 
Augite-porphyry  and  bedded  tuffs  are  the  rocks  chiefly  exposed  in 
