SOME SPECIES OF CALCAREOUS NANNOPLANKTON FROM THE PALEOCENE DEPOSITS OF THE SOUTHERN SLOPE OF THE UKRAINIAN CARPATHIANS
DOI:
https://doi.org/10.30970/pal.58.3Keywords:
calcareous nannoplankton, systematics, monographic description, stratigraphic significance, geographic distribution, Paleocene, southern slope of the Ukrainian CarpathiansAbstract
This study presents, for the first time, a monographic description of five species of calcareous nannoplankton from the southern slope of the Ukrainian Carpathians that are stratigraphically significant for Paleocene deposits: Biantholithus sparsus Bramlette & Martini, 1964; Fasciculithus tympaniformis Hay & Mohler in Hay et al., 1967; Fasciculithus involutus Bramlette & Sullivan, 1961; Heliotrochus cf. kleinpellii (Sullivan, 1964) Aubry, 2014 and Heliolithus riedelii Bramlette & Sullivan, 1961. The classification of taxa follows the system of J. R. Young and P. R. Bown (1997), based on the distribution of species into morphological groups, families, and genera. Amendments and updates proposed in recent publications and electronic nannopaleontological databases are also taken into account. For each taxon, detailed descriptions of morphological features, size ranges, stratigraphic distribution, and geographic distribution are provided. Particular attention is paid to diagnostic features enabling identification of taxa at different degrees of preservation. The study was conducted using light microscopy with immersion liquids and digital photodocumentation, allowing accurate documentation of nannofossil morphology. Light microscope images are presented for the aforementioned species, as well as for Markalius inversus (Deflandre in Deflandre & Fert, 1954) Bramlette & Martini, 1964 and Braarudosphaera bigelowii (Gran & Braarud, 1935) Deflandre, 1947, which are characterized by a wide stratigraphic range and occur in Paleocene deposits of the Ukrainian Carpathians. The results allow refinement of the taxonomic composition of nannoplankton from Paleocene deposits of the southern slope of the Ukrainian Carpathians in accordance with modern concepts of nannofossil systematics. This provides a higher level of detail for stratigraphic and biostratigraphic studies and facilitates further regional and interregional correlation of Paleocene sections.
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