Makrofauna utworów mioceńskich na fliszu karpackim w okolicy Dubiecka

Jadwiga Urbaniak

Abstrakt


MACROFAUNA OF MIOCENE DEPOSITS OVERLYING THE CARPATHIAN FLYSCH IN THE DUBIECKO AREA

Summary
Sandy-conglomerate deposits from Przedmieście Dubieckie and some other localities from the vicinitiescof Dubiecko (5, 11, 12) represent the most southern localities of patches of marine Miocene deposits with macrofauna resting on the CarpathianFlysch. Preliminary results of paleontological analysis of the Miocene from Przedmieście Dubieckie were published elsewhere (18). The paper deals with the characteristics of faunal assemblages, ecology, paleogeography and the age of the deposits: Upper Sandstone, A, and Lower Sandstone, B. The deposits occurring in sedimentary continuity in the same profiIe differ in lithology and faunal content (see faunal lists given in the Polish text). They represent two biofacial horizons differing in ecology which is reflected in the composition of organic assemblages. The deposits belong to the Lithothamnium-Heterostegina member of the Opolian substage of the Badenian stage. This dating is supported by the presence of the following species: Chlamys felsineum, Ch. similis, Ch. crispa, Ch. incomparabilis, Ch. diaphana, Ch. scrabella łomnickii, Panope menardi rudolphi, Pinna pectinata, Pycnodonta cochlear, Solenocurtus antiquatus, Pitar italica, Spisula subtruncata triangula, Anadara turonica, Donax intermedia, Scaphander lignarius and other macrofossils as well as some foraminifers such as Heterostegina costata. The species evidence connections between the Miocene from Przedmieście Dubieckie and coeval strata cropping out in vicinities of Rzeszów (Przylasek, Błędowa Tyczyńska, Niechobrz), Tarnów (Brzozowa, Iwkowa and Niskowa) and Korytnica (Chomentów, Pińczów), in Silesia (Dziedzice) and elsewhere. This type of littoral deposits and fauna is characterized by a wide paleogeographic range, indicating connections between northern and southern parts of the Opolian sedimentary basin (Carpathian and Holy Cross Mts regions, respectively).

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