Jurassic planktic foraminifera from the Polish Basin

Published on Jan 27, 2021in Journal of Micropalaeontology1.674
· DOI :10.5194/JM-40-1-2021
Maria Gajewska2
Estimated H-index: 2
(University of Warsaw),
Zofia Dubicka12
Estimated H-index: 12
Malcolm B. Hart32
Estimated H-index: 32
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.
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Abstract. The aim of this paper is to document three well-preserved morphotypes of Middle Jurassic (Bajocian) planktonic foraminifera from the continental margin of northwestern Australia. This location is on the southern shelf of the Middle Jurassic Tethys Ocean, and these occurrences of planktonic or meroplanktonic species are the first to be reported from the Jurassic of the Southern Hemisphere. The morphotypes include a new subspecies of Globuligerina bathoniana (Pazdrowa): Globuligerina bat...
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#1Malcolm B. Hart (University of Plymouth)H-Index: 32
#2Kevin PageH-Index: 18
Last. Christopher W. Smart (University of Plymouth)H-Index: 18
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Last. Lorenz Schwark (CAU: University of Kiel)H-Index: 55
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#2Andrew S. Gale (University of Portsmouth)H-Index: 49
Last. Ágnes Görög (ELTE: Eötvös Loránd University)H-Index: 10
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#1Felix M. Gradstein (University of Portsmouth)H-Index: 30
#2Andrew S. Gale (University of Portsmouth)H-Index: 49
Last. Larisa GlinskikhH-Index: 2
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The taxonomy is modernized and updated for Jurassic planktonic foraminifera using all available literature and stratigraphic series of sediment samples from Canada, Portugal, France, Switzerland, Poland, Lithuania, Russia and Dagestan. The regional stratigraphy of all sampled sections is outlined. Many of the 65–200 µm sample residues yielded well-preserved free specimens, with local assemblages containing up to six species. Thin sections were studied also but do not allow detailed taxonomy. Two...
Two Jurassic planktonic genera are emended and two new species and one subspecies of Jurassic planktonic foraminifera are defined. The genera are Globuligerina Bignot and Guyader 1971 and Conoglobigerina Morozova 1961 and the two new species are Globuligerina tojeiraensis Gradstein and Conoglobigerina grigelisi Gradstein. Both new species commonly occur in the Tojeira Formation, Montejunto, Portugal. The Tojeira Formation is a deeper marine shale unit of Early Kimmeridgian age. The new subspecie...
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#2Boris Nikitenko (NSU: Novosibirsk State University)H-Index: 1
Last. Alexander F. Wall (UC: University of Cincinnati)H-Index: 2
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Cited By1
#1Malcolm B. Hart (University of Plymouth)H-Index: 32
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