BIOSTRATIGRAPHIC ZONES AND ZONAL BENTOSIC FORAMINIFERA OF THE CENOMANE-MAASTRICHTIAN AGE OF THE UKRAINIAN INNER CARPATHIANS

Abstract

For the first time for the studied region in a continuous section of the Upper Cretaceous sediments along the Tereblya River in the village of Zabrzyd, according to the foraminiferal scheme of the Polish Carpathians, a sequence was distinguished by benthic foraminifers: the top of the Bulbobaculites problematicus zone (Cenomanian); the Uvigerinammina jankoi zone of the Turonian; the Spiroplectinella costata of the Konyak–lower Santonian; the Caudammina gigantea zone of the upper Santonian–lower Campanian; the Rzehakina inclusa zone of the upper Campanian–Maastrichtian. The reliability and validity of the conclusions (results) presented in the section are ensured by a significant amount of processed factual material and the application of research methods necessary for the biostratigraphic dissection of sediments enriched with planktonic and benthic foraminifers. The obtained results are in accordance with similar results of biostratigraphic studies by domestic and foreign researchers, which is confirmed by the correlation of the stratigraphic units identified in this work with the units of other areas of the Carpathians, the units of the “classical” sections of the Tethys region (in particular, the Gubio section in Italy) and the MSU. A register of the studied foraminifera has been compiled according to the classification adopted in the work. SEM images of benthic foraminifera characteristic of biostratigraphy and paleobathymetry are presented. Index species of the identified biostratigraphic zones (5 taxa) are described monographically.