Geoscience Reference
In-Depth Information
the area belongs to North Rhodopean anticline. The
sub-parallel faults of the Zaburdo fault zone, inter-
sected by fractures of the Laki fault zone (Kozhuharov
et al.
1994
) form a characteristic mosaic block and are a
precondition to the high degree of marble fracturing
and intensive karstification (Fig.
3.50
).
In the Dobrostan karst massif have been studied and
mapped over 200 caves and pot-holes (Pandev
1993
).
Definitely dominating the pot-holes, of which the deeper
is Druzhba Cave (absolute pit of 130 m., the biggest in
Bulgaria), Ivanova Voda Cave (-113 m with 45 m
entrance pit), and Zmiin Borun Cave (-108 m). The
considerable depths and the wide distribution of vertical
cave passages in the area are an indicator for active
geodynamic environment during the Quaternary (White
1988
).
The cave is dry and consists of one gallery with
narrow passages of 20, 40, and 70 m, separating a few
chambers. The total length of the gallery is 183 m.
The
Fig. 3.48
Rose-diagram of the directions of 68 fallen and
calcified to the floor stalagmites
deposits
are
represented
by
detritus
material
Fig. 3.49
Locations of the Yamata Cave and Shepran Cave and geological map of the area based on sheet ''Chepelare'' of the
Geological Map of Bulgaria in scale 1:100 000 (after Kozhuharov et al.
1994
)
