Integrated biostratigraphy of the Santonian through Maastrichtian (Upper Cretaceous) of extra-Carpathian Poland

Abstract

The biostratigraphic importance, current zonations, and potential for the recognition of the standard chronostratigraphic boundaries of five palaeontological groups (benthic foraminifers, ammonites, belemnites, inoceramid bivalves and echinoids), critical for the stratigraphy of the Santonian through Maastrichtian (Upper Cretaceous) of extra-Carpathian Poland, are presented and discussed. The summary is based on recent studies in selected sections of southern Poland (Nida Synclinorium; Puławy Trough including the Middle Vistula River composite section; and Mielnik and Kornica sections of south-eastern Mazury-Podlasie Homocline) and of western Ukraine (Dubivtsi). The new zonation based on benthic forams is presented for the entire interval studied. Zonations for ammonites, belemnites and inoceramid bivalves are compiled. All stage boundaries, as currently defined or understood, may easily be constrained or precisely located with the groups discussed: the base of the Santonian with the First Occurrence (FO) of the inoceramid Cladoceramus undulatoplicatus; the base of the Campanian with the Last Occurrence (LO) of the crinoid Marsupites testudinarius and approximated by the range of the foraminifer Stensioeina pommerana; and the base of the Maastrichtian approximated by the FO of the inoceramid bivalve Endocostea typica and the FO of the belemnite Belemnella vistulensis. The positions of substage boundaries, as currently understood, are constrained in terms of the groups discussed.

Maastrichtian island in the central European Basin—new data inferred from palynofacies analysis and inoceramid stratigraphy

“…1b) confirmed that these sections represent the lower part of the T. radiosus Zone. In the Jelcza Wielka (Peryt and Dubicka 2009;Jurkowska 2016) and Michałów Walaszczyk et al 2009Walaszczyk et al , 2010Walaszczyk et al , 2016 of the Upper Maastrichtian of studied area (Jurkowska 2016; this paper) (Jurkowska 2016) (Fig. 1b) are newly studied sections and are exposed at the temporary road cutting from Świątniki to Jędrzejów.…”

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“…Biozones based on local and regional occurrences have a low biostratigraphical resolution, which is excellently illustrated in this study by the succession of upper Campanian biozones (Bolivinoides decoratus subzone at the base and B. laevigatus subzone above it) (Jaff et al, 2014, p. 165, 168-169), which is an anti-evolutionary succession (B. laevigata is the ancestor of B. decorata and not vice versa). A collapse in biostratigraphical resolution in the use of the representatives of the genus Bolivinoides in Late Cretaceous biostratigraphy is recorded in the study of Dubicka in Walaszczyk et al (2016); besides the low taxonomic resolution given by the misidentification of one index species (B. culverensis) and use of a vaguely defined species without revision (B. vistulae), most of the Bolivinoides-based biozones are of partial taxon range type, with the species of this genus providing no bioevent corresponding to either lower or upper boundary (B. decoratus, B. miliaris, and B.…”

Turonian–Coniacian (Upper Cretaceous) of the Babadag Basin (North Dobrogea, Romania): integrated biostratigraphy and microfacies succession

“…It is well-known that very shal low or very deep, low pH en viron ments al low for the dom i nance and high abun dances of agglu ti nat ing foraminifera (Murray and Alve, 2011;Dubicka and Machalski, 2016;Walaszczyk et al, 2016a). In the Visterna sec tion, ag glu ti nat ing forms com monly co-oc cur with well preserved, keeled plank tonic forms, which may in di cate a higher en vi ron men tal tol er ance than in con tem po rary forms (Murray and Alve, 2011) of Late Cre ta ceous ag glu ti nat ing foraminifera.…”