Stratigraphy of the podhale flysch paleogene central carpathians based on calcareous nannoplankton ii. the zakopane formation along the northern margin of the tatra mountains poland

Dudziak, J.

Studia Geologica Polonica 83: 67-84


ISSN/ISBN: 0081-6426
Accession: 006486661

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Calcareous nannoplankton from the Zakopane Formation of the Podhale Flysch (Palaeogene), Central Carpathians, has been studied in shale samples taken from river sections along the northern margin of the Tatra Mts in Poland. Nannoplankton assemblages typical for nannoplankton zone NP 19 (Upper Eocene) of the standard zonation introduced by Martini (1971) have been recognized. The assemblages consist of the following nannofossils: Coccolithus bisectus (Hay, Mohler et Wade), C. coenurus Reinhardt, C. eopelagicus (Bramlette et Riedel) C. pelagicus (Wallich), C. pseudocarteri Hay, Mohler et Wade, Cyclococcolithus formosus Kamptner, C. neogammation Bramlette et Wilcoxon, Chiasmolithus oamaruensis (Deflandre), Reticulofenestra scissura Hay, Mohler et Wade, R. umbilica (Levin), Discolithina rimosa (Bramlette et Sullivan), Sphenolithus pacificus Martini, S. radians Deflandre, Braarudosphaera bigelowi (Gran et Braarud), Micrantholithus crenulatus Bramlette et Sullivan, Isthmolithus recurvus Deflandre, I. sp., Zygrhablithus bijugatus (Deflandre), Discoaster barbadiensis Tan Sin Hok, D. saipanensis Bramlette et Riedel, D. tani nodifer Bramlette et Riedel, and others. The above assemblage contains only infrequent discoasters which may be subdivided in three groups according to their state of preservation. The most frequent are those characterized by strong secondary calcite overgrowth, corroded and bearing traces of mechanical damage; this may indicate reworking and redeposition of discoasters. Well preserved forms devoid of calcitization and without traces of corrosion are infrequent; their good state of preservation is probably due to coating by organic substance (fecal pellets) present at the time of deposition. The third group contains infrequent discoasters without traces of corrosion and with moderate degree of calcitization (e.g., boundaries of radii distinguishable in Discoaster barbadiensis); these forms do not show traces of transportation and redeposition. They indicate that the lower part of the Zakopane Formation flysch just above carbonate Mid-Eocene strata, along the northern margin of the Tatra Mountains in Poland, represents Upper Eocene. Moreover, taking into account the rarity of discoasters as compared with other coccoliths, an uppermost Eocene age of the basal part of the Zakopane Formation flysch is suggested.