Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Upper Barremian to Lower Aptian dinoflagellate cysts in the dark pelitic sediments of the southern part of the Kotouč Quarry near Štramberk (Silesian Unit, Western Carpathians)

 

Eliška Jurková, Petr Skupien

Geoscience Research Reports 52, 2019, pages 27–33

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Published online: 7 March 2019

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Abstract

In connection with limestone extraction in the Kotouč Quarry, an extensive quarrying has recently been implemented in the southern part of the deposit. During these mining activities older backfills were removed and the quarrying continued in the dark-grey clayey-silty sediments that should, according to Eliáš (1996), belong to the Hradiště Formation. The new study builds on the documentation of three exposed sections extending from the 7th to the 6th level of the quarry, where grey to dark-grey claystones and siltstones are partially exposed.
Within a palynological analysis of the samples, 35 representatives of non-calcareous dinoflagellates were determined (Table 1). Selected characteristic specimens are shown in Fig. 7. Out of the determined dinoflagellates, stratigraphically significant are Aptea polymorpha, Cerbia tabulata, Cleistosphaeridium clavulum, Kiokansium polypes, Odontochitina operculata, Palaeoperidinium cretaceum and Subtilisphaera perlucida, which are characteristic of the Upper Barremian to Lower Aptian (Skupien, 1997, 2003; Skupien - Vašíček 2002). Aptea polymorpha, a rare species identified in the studied samples, may contribute to more accurate classification of sediments, and is attributed to the Lower Aptian within the Tuarkyricus to Weissi ammonite zones (Skupien - Vašíček 2002).
Apart from the dinoflagellate cysts, the organic material in the samples also contains spores, pollen, brown and black phytoclasts, cuticules, and foraminiferal linings (Fig. 8). Besides the palynomorphs, the sample 7/3 provided a well preserved scolecodont, i.e. jaws of fossil polychaete annelids, the occurrences of which are related to the conditions of littoral zones of the seas.
The composition of organic matter corresponds to sedimentation at the level of continental shelf near shore zone. It is supported by the palynomorph structure with prevailing abundance of terrestrial material, namely pollen and spores.
 

References

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