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Changes in benthic ostacod assemblages across the Devonian-Carboniferous boudary in the Holy Cross Mountains, Poland

100%

Olempska E.

Acta Palaeontologica Polonica

1997

tom 42

nr 2

291-332

The Kowala section situated in the southern part of the Holy Cross Mountains represents continuous sedimentation in almost the same facies across the Devonian-Carboniferous (D-C) transition. The D-C boundary has been identified about two meters above the top of the cephalopod nodular limestone with Wocklumeria. In the transitional deposits of the latest Famennian (Prothognathodus kockeli Zone) several faunally distinct units that correspond to relative sea level changes in the area have been identified. Ostracods are abundant in the Kowala sequence. Their assemblages contain well known index species and new ones of the Thuringian and Entomozoacean ecotypes. A total of 15 probably planktonic entomozoaceans, and 64 benthic species have been identified. Healdia shangquii sp. n. and Mauryella polonica sp. n. are proposed. A major change in the ostracod fauna takes place above the limestone with Wocklumeria within the transitional interval represented by clays and claystones with tuffites in its middle part. Thuringian and Entomozoacean ecotype ostracods disappear and are replaced by more shallow water 'exotic' assemblaged ominated by Healdia, Mauryella and Monoceratina species. In the early Tournaisian rocks Thuringian-, Entomozoacean- and Bairdin-type ostracods reappear with some of the same species as before, and with new Carboniferous index taxa.

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1 Acta Palaeontologica Polonica

1 Olempska E.

1 1997

Wyniki wyszukiwania

Changes in benthic ostacod assemblages across the Devonian-Carboniferous boudary in the Holy Cross Mountains, Poland