Integrated biostratigraphy and palaeoenvironments of the Upper Cretaceous in the Petrich section (Central Srednogorie Zone, Bulgaria)

Autor(en)

Polina Pavlishina, Docho Dochev, Michael Wagreich, Veronika Koukal

Abstrakt

The Upper Cretaceous succession (Coniacian to lowermost Maastrichtian, with focus on the Campanian) at Petrich, Central Srednogorie Zone in Bulgaria, is described and calibrated stratigraphically based on nannofossils, dinoflagellate cysts and inoceramids. The following standard nannofossil zones and subzones are identified: UC10-UC11ab (middle to upper Coniacian), UC11c-UC12-UC13 (uppermost Coniacian to Santonian), UC14a (lowermost Campanian), UC14b^TP-UC15c^TP (lower Campanian to 'middle' Campanian), UC15d^TP-UC15e^TP (upper Campanian), UC16a^TP (of Thibault et al. 2016; upper part of the upper Campanian), and UC16b (Campanian-Maastrichtian boundary). The base of the Campanian is defined by the FO of Broinsonia parca parca (Stradner) Bukry, 1969 and Calculites obscurus (Deflandre) Prins and Sissingh in Sissingh, 1977 (a morphotype with a wide central longitudinal suture). The Areoligera coronata dinoflagellate cyst Zone (upper lower Campanian to upper upper Campanian) is identified, corresponding to the UC14b^TP-UC16a^TP nannofossil subzones. The inoceramid assemblage indicates the 'Inoceramus' azerbaydjanensis-'Inoceramus' vorhelmensis Zone, correlated within the interval of nannofossil subzones UC15d^TP-UC15e^TP. The composition of the dinoflagellate cyst assemblages and palynofacies pattern suggest normal marine, oxic conditions and low nutrient availability within a distal shelf to open marine depositional environment during the Campanian.

Organisation(en)

Institut für Geologie

Externe Organisation(en)

Sofia University "St. Kliment Ohridski"

Journal

Acta Geologica Polonica

Band

73

Seiten

33-62

Anzahl der Seiten

30

ISSN

0001-5709

DOI

https://doi.org/10.24425/agp.2022.140431

Publikationsdatum

2023

Peer-reviewed

Ja

ÖFOS 2012

105123 Stratigraphie

Schlagwörter

ASJC Scopus Sachgebiete

Geology

Sustainable Development Goals

SDG 14 – Leben unter Wasser

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/333c014a-1b59-47fa-8628-98c821d85fb9