STRATIGRAPHICAL AND ECOLOGICAL SIGNIFICANCE OF EARLY EOCENE RADIOLARIANS FROM THE SUBSILESIAN SERIES, POLISH FLYSCH CARPATHIANS
Marta B¡K (1) & Wanda BARWICZ-PISKORZ (2)
1) Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, PL-30-063, Kraków, Poland; e-mail: mbak@ing.uj.edu.pl
2) Department of Stratigraphy and
Regional Geology, University of Science and Technology, Mickiewicza 30,
PL-30-059, Kraków, Poland
B±k, M. & Barwicz-Piskorz, W., 2005. Stratigraphical and ecological
significance of Early Eocene radiolarians from the Subsilesian Series,
Polish Flysch Carpathians. Annales Societatis Geologorum Poloniae, 75: 139–153.
Key words: Radiolaria, biostratigraphy, EECO, lower Eocene, Carpathians.
Abstract: Variegated
shales in the Early Eocene hemipelagic deposits of the Subsilesian
series, Polish part of the Western Carpathians, have yielded rich
siliceous microfossils comprising abundant radiolarians and rare
diatoms. Forty-three radiolarian taxa have been recognised.
One new radiolarian species, Amphisphaera subsilesianensis n. sp. was described. The assemblage represents the Phormocyrtis striata striata
radiolarian Zone of the tropical oceans. The deposits investigated have
also yielded abundant agglutinated foraminifera which correlate with
the lower Eocene Saccamminoides carpathicus
foraminiferal Zone. The radiolarian assemblage comprises a low content
of taxa characterising cool, oligotrophic water masses which also occur
in the upper Paleocene deposits of the Subsilesian series. Most part of
the assemblage is represented by abundant radiolarian species
characteristic of tropical domain, which may indicate the incursion of
warm water masses into the Subsilesian Basin during the Early Eocene
Climatic Optimum Period.
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Journal of the Geological
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