Yol.  49.] 
ST.  CASSIAN  STRATA  IN  SOUTHERN  TYROL. 
13 
III.  Topography  op  the  District. 
In  the  valleys  of  Ampezzo  and  Enneberg,  south  of  the  Puster- 
thal,  the  Wengen  and  St.  Cassian  Beds  are  well  exposed,  and 
abundant  opportunity  is  afforded  of  stud}dng  their  stratigraphical 
position  with  regard  to  the  overlying  strata. 
I  mapped  in  detail  three  areas  in  the  northern  part  of  the  4  Dolo¬ 
mite  Alps/  1 
(A)  The  classical  district  of  St.  Cassian  in  Enneberg  and  Sett  Sass  ; 
(B)  The  Ealzarego  Valley,  west  of  Cortina  d’Ampezzo  ; 
(C)  The  Prags  Valley  and  the  Diirrenstein  mountain  near  Toblach. 
The  field-work  was  done  upon  the  Survey  Maps  of  Austria-Hun¬ 
gary,  scale  1 :  25000  ;  the  maps  published  with  the  present  paper 
are  reduced  to  the  scale  of  1  :  50000,  or  1*267  inch  to  the  mile.2 
With  the  view  of  securing  at  once  a  series  of  typical  sections  I 
made  several  traverses  of  other  districts,  such  as  the  Seisser  Alpe, 
north  of  Schlern ;  the  Sella  Joch  and  the  Groden  Joch;  the  Lower 
Enneberg  ;  Tre  Croci  and  Misurina.  Only  a  part  of  my  observations 
in  these  districts  is  given  here. 
The  Enneberg  Valley  opens  into  the  main  east-and-west  valley  of 
the  Pusterthal  at  Bruneck,  while  the  Ampezzo  Valley  opens  into  the 
Pusterthal  at  Toblach. 
The  Gader  stream  flows  north  through  Enneberg,  cutting  in  its 
upper  part  through  the  Abtey  slopes  between  Stern  and  St.  Leon- 
hardt  (Abtey).  At  Stern  the  two  branches  of  the  Gader  stream 
meet ;  these  are  the  Pescadoi  or  Grosser  stream  from  the  west  (on 
which  Colfuschg  and  Corvara  lie)  and  the  Sore  stream  (on  which 
St.  Cassian  lies)  from  the  north.  The  Sore  is  joined  higher  up  by  the 
Eisenofen  (or  Valparola)  and  by  the  Stuores  and  Piccol  streams. 
The  Gardenazza  massif  rises  on  the  western  side  of  the  Enneberg 
Valley,  and  the  Sella  massif  extends  farther  south,  forming  the 
watershed  between  this  northern  region  and  the  Eassa  district. 
Between  these  two  dolomite-ma«m’/s  the  Groden  Pass  leads  -  from 
Enneberg  to  the  Grodenthal.  The  latter  is  the  narrow  valley  north 
of  Lang  Kofi,  Platt  Kofi,  and  Schlern,  which  joins  the  Eisack  some 
distance  north  of  Botzeu. 
On  the  eastern  side  of  the  Enneberg  Valley  the  great  massif  of 
Ivreuz  Kofi,  La  Varella,  Centurinus  and  Lagazuoi  extends  south  to 
the  Tra  i  Sassi  Pass.  The  district  of  Sett  Sass  and  Prelongei  lies 
between  the  two  sources  of  the  Gader  (Sore  and  Grosser  streams), 
is  bounded  by  the  Buchenstein  Valley  in  the  south  and  south-east, 
and  is  surrounded  on  every  other  side  by  dolomite-wassiys. 
The  Tra  i  Sassi  Pass  leads  from  Enneberg  eastward  to  Cortina, 
between  Sett  Sass  and  Lagazuoi,  and  holds  north  of  Huvolau.  The 
Ospizio  in  Falzarego  is  high  on  the  eastern  side  of  the  Pass,  and  the 
1  These  three  areas  are  included  within  the  Austrian  Map.  Scale  1 :  75000; 
Sheet  Cortina,  Zone  19,  Col.  vi. 
2  The  sections  are  drawn  to  the  natural  scale,  vertical  and  horizontal ;  but 
in  some  cases  the  dip  of  the  beds,  and  therefore  the  thickness,  has  been  slightly 
exaggerated. 
