ORIGINAL ARTICLE
Silicoflagellates and other siliceous micro- and nannofossils from Rupelian diatomites, southeastern Poland
1
Biology Department, Mount Allison University, Sackville, New Brunswick,
E4L 1G7, Canada
2
Digital Microscopy Facility, Mount Allison University, Sackville, New
Brunswick, E4L 1G7, Canada
Online publication date: 2024-07-16
Publication date: 2024-07-16
Plant and Fungal Systematics 2024; 69(1): 85-98
KEYWORDS
Central ParatethysClathropyxidelladictyochophyceansEarly OligoceneMacrorarotosphaeridianssiliceous nanoscales
ABSTRACT
The Eocene-Oligocene Transition is one of the major stages of the Cenozoic
reshaping of the world oceans with associated changes in climate, of ocean coastlines and
circulation patterns. This altogether created challenging environments for fossilization and
preservation of native biota. Consequently, well preserved Oligocene fossils are infrequent
worldwide and just as rare in the Central Paratethys. The well-preserved Rupelian (Early
Oligocene) diatomites from the Skole Nappe, the external unit of the Outer Carpathians in
southeastern Poland were deposited in the Central Paratethys. In some samples, in addition
to diatoms, sediments also contain a great diversity of other silicified micro- and nannofossils.
Here we report our findings of silicoflagellates (fifteen taxa from five genera), two
rotosphaeridians, and several morphotypes of fossil scales, some of uncertain taxonomic
affinity. Among silicoflagellates, the most common are species from genera Corbisema
(C. triacantha, C. hastata, and C. apiculata) and Dictyocha (D. clinata and D. fibula). We
also recovered scales of rotosphaeridians (Pinaciophora and possibly Rabdiophrys) and
remains of organisms of uncertain affinity (Clathropyxidella and Macrora) often reported
together with silicoflagellates. All of these taxa are the first reports for the Central Paratethys.
Silicoflagellate species composition is consistent with the datums derived from other
fossils. Silicoflagellates, marine diatoms and archaeomonads suggest a neritic depositional
environment.
FUNDING
Funding for field work, sample processing and early analyses in the mid- to late
1970s was provided by the AGH and PAS in Kraków and the
Polish Geological Institute in Warsaw.
Funding for electron microscopy of siliceous microfossils was provided by
an NSERC Discovery Grant and the Mount Allison University
Marjorie Bell Faculty Fund (Sabbatical) awarded to IK.
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