Abstract
Abstract. Jurassic (Bathonian–Oxfordian) planktic foraminifera from the epicontinental strata of the Polish Basin have been investigated. The palaeoecology, palaeobiogeography, and biostratigraphical potential of the recorded taxa are discussed. Four species are recorded: Conoglobigerina helvetojurassica (Haeusler, 1881), Globuligerina balakhmatovae (Morozova, 1961), G. bathoniana (Pazdrowa, 1969), and G. oxfordiana (Grigelis, 1958). This assemblage is probably the most diverse of those described to date from the epicontinental areas of Europe. The recorded taxa are thought to represent three different ecological morphotypes. The clear relationship between transgressive–regressive facies and the palaeobiogeography of the recorded planktic foraminifera indicates a morphotype-related depth–distribution pattern in which small, simple, globular-chambered morphotypes occupied shallow waters whereas slightly larger, more complex forms, or those with hemispherical chambers, inhabited deeper and more open-water environments.
Highlights
Foraminifera constitute an unique group of marine protists that are used extensively as biostratigraphical and palaeoenvironmental proxies in the Earth sciences
Because the area of extra-Carpathian Poland was covered during the Middle and Late Jurassic by a relatively shallow, epicontinental, sea that extended from the northern part of the Tethys, it appears to be a favourable ecological niche for planktic foraminifera and contains an important fossil record (Olszewska and Wieczorek, 1988; Wierzbowski et al, 2009) in both the deeper waters of the Inner and Outer Carpathians and the shallower waters of the foreland region of the Polish Basin
Wernli and Görög (1999) resorted to acid reductions of limestones from Hungary in order to study their material in 3-D. Despite these uniquely favourable research conditions in the Polish Basin, Jurassic planktic foraminifera have been described by very few authors, mostly during the 1960s and 1970s (Bielecka, 1960; Bielecka and Styk, 1967; Pazdrowa, 1969; Fuchs, 1973; Olszewska and Wieczorek, 1988)
Summary
Foraminifera constitute an unique group of marine protists that are used extensively as biostratigraphical and palaeoenvironmental proxies in the Earth sciences. These mudstones allow specimens to be extracted with little difficulty This procedure is essential for morphological analysis and taxonomic identification of the planktic taxa, as compared to the thin section studies of Görög (1994) and Wernli and Görög (2000). Wernli and Görög (1999) resorted to acid reductions of limestones from Hungary in order to study their material in 3-D Despite these uniquely favourable research conditions in the Polish Basin, Jurassic planktic foraminifera have been described by very few authors, mostly during the 1960s and 1970s (Bielecka, 1960; Bielecka and Styk, 1967; Pazdrowa, 1969; Fuchs, 1973; Olszewska and Wieczorek, 1988). The aim of our research was to summarize the present
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