72 
MISS  OGILV IE  ON  THE  WENGEN  AND 
[Feb.  1893, 
At  Nockboden,  where  St.  Cassian  strata  are  no  longer  present, 
the  section,  according  to  the  same  reading,  would  give  :  — 
{Schlern  Dolomite. 
Mendola  Dolomite. 
This  is,  so  far  as  mere  succession  of  beds  goes,  a  case  exactly 
analogous  to  the  succession  in  the  Tiers  Valley,  the  Rosengarten, 
and  other  massifs  of  the  western  region.  It  has  been  proved  in 
that  district  that  the  strata  which  in  many  other  places  intervene 
between  the  Mendola  Dolomite  and  the  Schlern  Dolomite  thin  out 
gradually  in  a  continuous  development  of  dolomite.  And  this  very 
natural  explanation  has  also  been  applied  to  the  district  north  of 
the  Diirrenstein.  The  evidence  which  previous  authors  have  found 
in  the  latter  district  is  largely  based  on  the  appearances  at  Mesner 
Kofi  and  at  Sari  Kofele  ;  these  are  regarded  as  dolomitic  masses 
belonging  to  Wengen  or  St.  Cassian  time  and  thinning  out  in  the 
marls  or  shales  of  the  Sari  Alp  and  of  the  Kameriod  Wiesen,  a  con¬ 
formable  succession  being  thus  presented  from  the  Diirrenstein  to 
Lung  Kofi  (in  descending  order) : — 
Diirrenstein  .  Dolomite  (by  some  regarded  as  St.  Cassian 
Dolomite). 
Flodig-er  Wiese .  St.  Cassian  strata  (non-dolomitie). 
Sari  Kofele  .  St.  Cassian  or  Wengen  Dolomite. 
|  Wengen  strata  (non-dolomitic),  with  con- 
j  temporaneous 
|  Reef-dolomite. 
Intervening  Valley  .  Wengen  and  Buchenstein  strata  (non- 
dolomitic). 
Lung  Kofi .  Mendola  Dolomite. 
According  to  the  same  view,  the  non-dolomitic  strata  are  repre¬ 
sented  above  the  Toblach  Valley  by  a  dolomitic  facies  continuously 
developed  during  all  the  periods  that  elapsed  between  the  laying 
down  of  the  Mendola  Dolomite  and  of  the  Raibl  strata. 
The  dolomite-rock  of  Mesner  Kofi  is,  according  to  the  succession 
quoted,  a  Wengen  Dolomite,  and  not  Mendola  Dolomite.  As  yet 
no  fossils  have  been  found  in  it,  but  in  the  districts  east  and  west 
Gyroporella  pauciforata,  a  Muschelkalk  form,  occurs  frequently  in  a 
dolomitic  rock  which  has  also  been  assigned  to  the  Wengen  period. 
With  respect  to  the  dolomite  of  Mesner  Kofi  I  can  only  bring 
forward  stratigraphical  evidence.  As  I  have  already  said,  and  as 
may  be  seen  in  my  map,  the  Buchenstein  and  Wengen  Beds  which 
are  exposed  in  the  valley  between  Lung  Kofi  and  Mesner  Kofi  are 
strongly  crushed  and  sheared.  The  Wengen  Beds  come  in  contact 
with  the  dolomite-rock  of  Lung  Kofi  on  the  ridge,  while  lower  down 
on  the  western  slope  the  Buchenstein  Beds  are  in  contact  with  that 
of  Mesner  Kofi.  Farther  east,  on  the  eastern  slope  of  the  Sari  Alp, 
the  Buchenstein  and  Wengen  Beds  are  cut  off  against  the  dolomite 
of  Mesner  Kofi,  and  have  a  different  strike  from  it  and  from  the 
outcrop  of  the  same  beds  on  the  western  slopes. 
Sari  Alp 
Mesner  Kofl 
