Malakostratigrafie penitcoveho previsu ve vchodu jeskyne Reciste (Moravsky kras)

The studied sedimentary sequence in the entrance of the Řečiště Cave is situated in the west-facing limestone cliff of the Pustý žleb canyon at elevation 422 m, 29 m above the valley bottom. It is dominated by breakdown from fine fragments to boulders with a loose matrix, consisting in layers 9-6 predominantly of loose CaCO3-precipitates - the foam sinter (Fig. 1). The whole deposit includes a rich molluscan fauna (Table 1). The snail communities can be subdivided into 3 assemblage zones: (1) Tolerant steppe fauna dominated by Pupilla sterri and Vallonia costata in the lowermost layers 10-11, (2) a mixture of xerothermophilous rupestral elements (Granaria frumentum, Chondrina clienta and Pupilla ssp. in high amounts) coming from the sunny cliff face above the cave with a number of woodland species (incl. the Carpathian element Vitrea transsylvanica) incorporated in the foam-sinter matrix of layers 9-6, and (3) the species-richest malacofauna of layers 5-1 with increasing numbers of demanding woodland snails (incl. Aegopis verticillus, Macrogastra latestriata and other Clausiliidae) and decreasing rates of the above mentioned xerothermophiles and open-ground elements. The species richness of woodland fauna culminated only in layer 2. Such succession is characteristic of the decidous forest zone in the mid-European hill-countries and lower uplands. From the malacostratographic point of view the layers 11-10 may be attributed to the Preboreal, 9-6 to the Boreal and 5-1 to the younger half of the Holocene.