14 
MISS  OGILYIE  OH  THE  WENGEN  AND 
[Feb.  1893, 
road  to  Cortina  continues  to  descend  for  the  greater  part  of  its  length 
along  the  northern  bank  of  the  Costeana  stream.  Tofana  Prima 
and  Secunda  form  high  dolomite-wossifs  north  of  the  valley,  while 
ISuvolau  and  Cinque  Torri  extend  along  the  southern  side. 
Cortina  lies  in  a  deep  basin  where  two  tributary  streams,  the 
Costeana  from  Falzarego  and  the  Bigontina  from  Tre  Croci  in  the 
east,  open  into  the  Boita  Valley.  Ascending  the  Boita  Valley  the 
Ampezzo  road  leads  north  between  Tofana  and  Pomagagnon,  then 
turns  eastward  at  Peutelstein  and  passes  between  Croda  Bossa  and 
Crist  alio  to  Schluderbach.  Here  the  road  again  turns  northward  and 
follows  the  course  of  the  Bienz  stream  past  Landro  to  Toblach. 
West  of  the  road  is  the  JDiirrenstein  massif ,  extending  north  and 
south  between  the  Bienz  Valley  and  the  high  mountain-pass  of  the 
Platz  Alp.  Northward  it  is  bounded  by  high-lying  meadows ;  an 
outer  band  of  dolomite,  the  Sari  Kofi  and  Sari  Brand,  forms  then  the 
steep  descent  north  of  the  Diirrenstein  to  the  Pusterthal  between 
Toblach  and  Niederdorf. 
IV.  The  General  Stratigrapiiical  Succession. 
The  Triassic  strata  exposed  within  the  district  examined  are,  in 
descending  older  : — 
8.  The  Dach stein  Dolomite. 
7.  The  Raibl  Beds. 
6.  The  Schfern  Dolomite. 
5.  The  St.  Cassian  Beds. 
4.  The  Wengen  Beds. 
3.  The  Buchenstein  Beds. 
2.  The  Muschelkalk. 
1.  The  Werfen  Beds. 
1.  The  Werfen  Beds.1— A  glance  at  the  geological  maps  accom¬ 
panying  this  paper  (facing  pp.  18,  28,  and  32)  shows  that  the 
Werfen  Beds  seldom  have  an  outcrop  in  the  districts  examined. 
They  are  mainly  exposed  in  the  neighbourhood  of  the  crystalline 
schists  south  of  the  Pusterthal,  near  Prags,  and  again  in  the  Lower 
Enneberg  Valley.  In  the  Cortina  district  they  are  nowhere  exposed. 
In  the  Upper  Enneberg,  an  exposure  of  Werfen  Beds  occurs  from 
the  Grbden  Pass  eastward  towards  the  village  of  St.  Cassian,  but 
their  chief  extent  is  farther  south,  along  the  valley  of  Buchenstein. 
These  strata  are  a  series  of  dark-grey  limestones  and  marls, 
argillaceous  shales,  reddish  micaceous  or  sandy  clays,  attaining  a 
thickness  of  300  to  500  feet.  Their  characteristic  fossils  are  Posido- 
nomyci  Clarai ,  Emmrich,  and  Naticella  costata,  Munster. 
2.  The  Muschelkalk. — In  all  the  above-mentioned  cases  of  outcrop 
of  the  Werfen  or  Lower  Triassic  Beds,  they  are  conformably  suc¬ 
ceeded  by  beds  of  limestone  and  dolomite,  containing  characteristic 
Muschelkalk  fossils. 
1  The  name  was  given  to  this  lowest  horizon  of  Alpine  Trias  from  the  village 
of  Werfen  in  Salzkammergut. 
