Yol.  49.]  ST.  CASSIAN  STRATA  IN  SOUTHERN  TYROL.  69 
The  observations  detailed  above,  so  far  as  they  go,  show  that : — 
(1)  The  Cortina  district  has,  in  its  western  part,  the  closest 
tectonic  connexion  with  the  Yalparola  district. 
(2)  The  strata  of  Tofana  Secunda  bend  round  near  Cortina  by 
means  of  radial  faults. 
(3)  There  follows  in  this  neighbourhood,  south  of  the  sunken  area 
of  Tofana,  a  raised  system  of  strata  in  which  St.  Cassian  Beds  now 
form  the  surface-outcrop. 
(4)  Within  the  raised  system,  Crepa  occurs  as  a  faulted-down 
block  of  younger  beds. 
(5)  St.  Cassian  strata  conformably  underlie  Schlern  Dolomite  in 
the  neighbourhood  of  Ospizio  in  Ealzarego  ;  in  the  other  parts  of  the 
map  the  St.  Cassian  Beds  are  faulted,  and  come  into  contact  with 
the  Schlern  Dolomite,  the  Baibl  Beds,  and  the  Dachstein  Dolomite. 
(iv.)  The  District  of  the  Durrenstein  and  the  Sari  Alp. 
(See  Wap  C,  facing  p.  32.) 
As  already  mentioned,  the  district  of  the  Diirrenstein  is  inter¬ 
mediate  between  the  outer  zone  of  older  Trias  forming  the  low 
hills  south  of  the  Pusterthal,  and  the  sunken  1  Dachstein  ’  district 
represented  here  by  the  great  dolomite-massi/s  of  Croda  Bossa, 
Cristallo,  etc. 
The  Werfen  Beds  and  the  Muschelkalk  are  exposed  north-east  of 
Alt-Prags.  The  Muschelkalk  is  repeated  three  times,  at  Lung  Kofi, 
at  Mesner  Kofi,  and  at  Sari  Kofele  ;  the  strike  is  always  east-and- 
west,  and  the  dip  southerly.  Faults  parallel  with  the  strike  of  the 
beds  separate  the  three  systems  from  one  another  ;  these  faults  must 
be  regarded  as  one  system  of  step-faults,  throwing  down  the' strata  to 
the  north  and  repeating  them  to  the  south.  I  referred,  in  the  general 
remarks  on  the  tectonic  relations  (p.  58),  to  such  step-faulting  as 
being  of  frequent  occurrence  in  the  outer  zone  of  older  Triassic  rocks. 
The  Werfen  Beds  are  exposed  north  of  Badmeister  Kofi  and 
Alwartstein,  and  pass  over  Puez  Alp,  Sueskopf,  and  Troger  Alp, 
eastward  to  the  Toblach  Yalley.  At  Badmeister  Kofi  and  Alwart¬ 
stein,  Lower  Muschelkalk,  Mendola  Dolomite,  Upper  Muschelkalk, 
Buchenstein  strata,  and  Wengen  Beds  succeed  the  Werfen  Beds 
regularly,  the  lower  strata  dipping  at  a  very  high  angle  southward, 
the  higher  strata  not  so  steeply  (strike  W.K.W.  and  E.S.E.). 
The  Wengen  Beds  form  the  Kameriod  Wiesen  and  extend  south¬ 
ward  towards  Heimwald  Kofi.  Heimwald  Kofi  is  a  steep  cliff  of 
Mendola  Dolomite  rock,  succeeded  onSchafriedl  by  highly- contorted 
beds  of  Buchenstein,  Wengen,  and  St.  Cassian  age.  The  general 
strike  of  this  system  is  north-eastward,  the  dip  south-easterly.  A 
fault  therefore  separates  the  systems  of  Heimwald  Kofi  and  Sehaf- 
riedl  from  the  Kameriod  Wiesen. 
The  Mendola  Dolomite  of  Lung  Kofi  meets  in  the  Lung  Yalley  the 
Buchenstein  and  Wengen  strata  of  the  outer  system.  Again,  in  the 
ravine  between  Lung  Kofi  and  Mesner  Kofi,  Buchenstein  and  Wen¬ 
gen  strata  occur.  Here  they  have  a  very  high  dip  and  are  much 
