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of the whole rock mass,which constitutes a "compact mass" together with the andesitic cemented cobbles.

On the contrary the monastery yard, which is situated at the top of the ridge, is composed mainly of losse fine-grained materiał of volcanic origin, the looseness of the grains being due to external factors, as agents of erosion to which the materiał is exposed. Similar erosion processes have been observed in several loca-tions at the foot of the slope as well as over its surface.

3. NOTĘ OF LOCAL DANGEROUS DISCONTINUITIES AND CRACKS

Within the concave, the rock is intact, as it is not subjected to atmospheric processes. On the other hand wherever it is exposed, as on the surface, the medium loses its cohesion. This weathering process is most probably a pheno-menon at the surface.

Several faults or cracks have been noted along the side of the slope towards the inhabited area of the sea side, the most important being as follows:

a.    There is a natural triangular concave under the wali of the stairs of the monastery. This extends over a large

part of the total height of the slope,    Phot. 2.

having a base of approx. 10m. and a depth of 4 to 5m (see Photos 1,2 and 4 point (1)).

b.    Under the steeple of the monastery, there is a surface system of smali faults, surrounding a wedge-like zonę. This zonę extends almost over the whole height of the slope and has a width of 4-5m. under the monstery yard (see Photos 1,2 and 4 ooint (2)).

Phot. 3

c. At a distance of approximately 10m from the zonę of point 2^ there is another zonę of smali faults which extends from the basis of the wali of the monastery up to the ceiling of the artificial con-cave, the width of this zonę being up to 5 to 6m. The erosion is intense at the surface of the zonę and it could be attributed to a certain degree to the

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