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Updated: May 19, 2025
The region is one of lacustrine deposits called the Sandstone of Carcassonne; it is friable, argilaceous marl. The opening into the hypogee is in the middle of a field, and there are no indications around of the deposition of the material extracted in the formation of the retreat, so as to betray its presence.
The range in the Crimea from Cape Kersonese to the Bay of Ratla is formed of layers of limestone alternating with clay and argilaceous schist, a disposition of the strata that tends greatly to accelerate the disintegration of the cliffs. The clay gradually washed out by springs or eaten away by the weather forms great caverns in the sides, and these are liable to fall in when deprived of support.
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