Abstract
The Lower Jurassic olistolith exposed in Lukoveček (Klein-Lukow) near Fryšták (Freistadtl) provides extraordinary insight into the sedimentological history of the Outer Western Carpathians. Geological and palaeontological investigations of these uniquely preserved deposits are, however, very few (it represents a single record within the Magura unit of the Carpathian flysh in Czech Republic). The relatively little scientific interest in this locality was probably also due to the poor preservation of fossils, which often does not allow a closer taxonomic determination. Several species of bivalves, ammonites, echinoids, brachiopods, forams and, last but not least, belemnites were reported (Rzehak 1904).
Lithologically, the deposits consist of shallow-water crinoid limestones. Organic-rich intercalations (?) contain pyrite and show, in some cases, pseudooolithic structures (Andrusov 1959; Rakús et al. 1990). Based on the recorded fauna, Oppenheimer (1913) previously assigned the grey heavy-bedded limestones to the Oxfordian-Kimmeridgian (Rakús 1987).
It is possible that the Lower Jurassic rocks of the Magura Flysh of Western Slovakia have had a much more extensive area of occurrence (Andrusov 1959). Apart from the rare occurrence of the Lower Jurassic rocks within the Flysch Belt, similar deposits can often be found within the Klippen Belt and other Carpathian units (Rakús et al. 1990). The presence of the previously reported Oxfordian-Kimmeridgian fossils from Lukoveček is still not reliably tectonosedimentarily explained. Perhaps, they belong to another sort of deposits, which are not exposed nowadays and may have a similar origin as younger Jurassic exotica described from the territory of the surrounding states (e. g.; Książkiewicz 1956; Olszewska and Wieczorek 2001; Wierzbowski et al. 2006).
References:
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