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Late Miocene freshwater phytoplankton from Józefina (Poland)

Elżbieta Worobiec and Elübieta Worobiec
Micropaleontology
Vol. 56, No. 6 (2010), pp. 517-537
Stable URL: http://www.jstor.org/stable/40983739
Page Count: 21
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Late Miocene freshwater phytoplankton from Józefina (Poland)
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Abstract

The paper presents results of detailed investigation of freshwater microalgae from the Upper Miocene deposits from Józefina (Kraków-Silesia Upland, central Poland). During the studies 28 microphytoplankton species of the genera Sigmopollis, Geiselodinium, Botryococcus, Ovoidites, Cycloovoidites, Stigmozygodites, Diagonalites, Tetraporina, Spintetrapidites, Closterite-trapidites, Planctonites, Cystidiopsis, Zygodites, and Pseudoschizaea were identified. One new species Closteritetrapidites pacltovae E. Worobiec sp. nov. has been proposed. Most of the recorded algae preferred meso-to eutrophic, stagnant or slowly flowing shallow waters. The presence of resting cells – e.g. zygospores of Zygnemataceae (Mougeotia, Spirogyra, and Zygnema) and desmids (Closterium), suggests that the water body (bodies) might periodically dried out. The occurrence of Pseudoschizaea is characteristic for warm climate, possibly with seasonal moisture fluctuations. Occurrence of determined species in various localities (listed in synonyms) suggests that these algae were widespread in the past.

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