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1 Bulletin of the Polish Academy of Sciences. Earth Sciences

1 2003

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Biostratigraphy and Palaeoecology of Early Palaeogene Deep Water Foraminiferal Assemblages from the Subsilesian Unit in the Żywiec Tectonic Window (Polish Outer Carpathians)

Waśkowska-Oliwa A., Leśniak T.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2003

Vol. 51, nr 1

11-27

Taxonomic composition, biostratigraphic significance and the morphogroup distribution of foraminifera have been analysed in the lower Palaeogene deposits of the Subsilesian Unit. The studied deposits consist mainly of hemipelagic/pelagic shales and marls and shaly turbidites deposited at considerable depths close to CCD. The foraminiferal assemblages dominated by deep-water agglutinated taxa represent four agglutinated foraminiferal zones: Rzehakina fissisto-mata, Spiroplectammina spectabilis (Paleocene), Glomospira div.sp. acme, and Saccamminoides carpathicus (Early Eocene). Palaeoecological conditions favoured the development of diversified microfauna occupying all ecological niches. The Paleocene/Eocene boundary crisis was pronounced by a decrease in taxonomic diversity and a mass occurrence of the genus Glomospira.