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2 Acta Geologica Polonica

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The Middle Miocene of the Fore-Carpathian Basin (Poland, Ukraine and Moldova)

Wysocka A., Radwański A., Górka M., Bąbel M., Radwańska U., Złotnik M.

Acta Geologica Polonica

2016

Vol. 66, no. 3

351--401

Studies of Miocene sediments in the Fore-Carpathian Basin, conducted by geologists from the University of Warsaw have provided new insights on the distribution of the facies infilling the basin, particularly in the forebulge and back-bulge zones. The origin of the large-scale sand bodies, evaporitic deposits and large-scale organic buildups is discussed, described and verified. These deposits originated in variable, shallow marine settings, differing in their water chemistry and the dynamics of sedimentary processes, and are unique with regard to the fossil assemblages they yield. Many years of taxonomic, biostratigraphic, palaeoecologic and ecotaphonomic investigations have resulted in the identification of the fossil assemblages of these sediments, their age, sedimentary settings and post-mortem conditions. Detailed studies were focused on corals, polychaetes, most classes of molluscs, crustaceans, echinoderms, and fishes.

Nassariid assemblages from the Korytnica Clays - a useful tool for local stratigraphic correlation

Złotnik M.

Acta Geologica Polonica

2003

Vol. 53, nr 4

359-374

Analysis of the distribution of species of the family Nassariidae (Gastropoda, Prosobranchia) in the Middle Miocene Korytnica Clays (Holy Cross Mountains, central Poland) enabled five nassariid assemblages to be distinguished, viz. the (1) Nassarius restitutianus, (2) N. restitutianus-korytnicensis, (3) N. korytnicensis, (4) N. korytnicensis-limatus and (5) Nassarius schoenni assemblages. The schoenni and korytnicensis-limatus assemblages occupied the littoral zone of the Korytnica Basin. The remaining nassariid assemblages inhabited different offshore environments. Nassariid assemblages appear to be useful tool for local stratigraphic correlation as their succession is identical within almost the entire study area, excluding the littoral zone. The lower limit of one of the most widespread nassariid assemblages (korytnicensis assemblage) is proved to be an isochronous surface. The isochronous nature of other boundaries between the nassariid assemblages recognised in the succession is also postulated. The entire nassariid sequence is interpreted as a record of temporal changes in the relative size of two large gastropod populations: the population of Nassarius restituanus and the population of Nassarius korytnicensis. Environmental requirements of the most abundant nassariids are described in detail.