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
Source
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.
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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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Changes in morphology during ontogeny can have profound impacts on the physiology and biology of a species. Studies of ontogenetic disparity through time are rare because of the lack of preservation of developmental stages in the fossil record. As they grow by incremental chamber accretion and retain evidence of growth in their shell, planktic foraminifera are an ideal group for the study ontogenetic disparity through the evolution of a higher taxon. Here, we quantify different developmental sta...
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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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Abstract. The Christian Malford lagerstatte in the Oxford Clay Formation of Wiltshire contains exceptionally well-preserved squid-like cephalopods, including Belemnotheutis antiquus (Pearce). Some of these fossils preserve muscle tissue, contents of ink sacks and other soft parts of the squid, including arms with hooks in situ and the head area with statoliths (ear bones) present in life position. The preservation of soft-tissue material is usually taken as an indication of anoxic or dysaerobic ...
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#1Wolfgang Ruebsam (CAU: University of Kiel)H-Index: 10
#2Bernhard Mayer (U of C: University of Calgary)H-Index: 74
Last. Lorenz Schwark (CAU: University of Kiel)H-Index: 55
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Abstract The Earth's cryosphere represents a huge climate-sensitive carbon reservoir capable of releasing carbon dioxide (CO2) and methane (CH4) from permafrost soils or gas reservoirs capped by permafrost and ice caps upon rising global temperatures. Carbon release from these reservoirs has the potential to further accelerate global warming. Present day cryosphere demise is a focus of scientific research. The potential role of cryosphere carbon reservoirs in Mesozoic climate perturbations is ev...
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#1Felix M. Gradstein (University of Oslo)H-Index: 30
#2Andrew S. Gale (University of Portsmouth)H-Index: 49
Last. Ágnes Görög (ELTE: Eötvös Loránd University)H-Index: 10
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The stratigraphy, palaeoecology and palaeobiogeography are outlined for two genera and ten species of Jurassic planktonic foraminifera described in Gradstein et al. (Swiss J Palaeontol 2017. doi: 10.1007/s13358-017-0131-z). The two genera are Globuligerina and Conoglobigerina. Globuligerina probably appeared in late Toarcian (late Early Jurassic) and Conoglobigerina first occurred in Middle Oxfordian (early Late Jurassic). Within the two genera ten species are defined, including from older to yo...
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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...
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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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The article presents the self-revision and re-description of the first planktonic foraminifera Globuligerina oxfordiana (Grigelis, 1958) discovered in the Upper Jurassic of Lithuania. The original article published in 1958 in a Russian periodical (Moscow) is translated, supplied by additional comments, and illustrated by SEM laser electronic micrographs.
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#1Horacio ParentH-Index: 11
#2Michał Zatoń (University of Silesia in Katowice)H-Index: 24
Asphinctites tenuiplicatus [M] and Polysphinctites secundus [m] from the Asphinctites tenuiplicatus Zone (Early Bathonian), are usually considered as a sexual dimorphic pair, although authors describe them as separate species. We used statistical methods to test the sexual dimorphic correspondence between those morphospecies, based on a rather large sample of well-preserved macro- and microconchs derived from a single horizon of calcareous concretions in the Polish Jura. Our results indicate tha...
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#1Clémentine Colpaert (NSU: Novosibirsk State University)H-Index: 3
#2Boris Nikitenko (NSU: Novosibirsk State University)H-Index: 1
Last. Alexander F. Wall (UC: University of Cincinnati)H-Index: 2
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Abstract Foraminiferal associations from the Upper Callovian to Lower Kimmeridgian beds of the Makar'yev reference section (Volga Basin, East European Platform) provide insights into contemporaneous palaeoecological, palaeoenvironmental and palaeoceanographic conditions. Foraminiferal associations were studied using semi-quantitative methods, morphogroup analyses and various biodiversity indices, and were compared with different abiotic factors, including transgressive and regressive events, var...
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#1Malcolm B. Hart (University of Plymouth)H-Index: 32
Abstract null null The long-running debate over the use of a formally defined Middle Cretaceous is discussed in terms of the distribution of both planktic and benthic foraminifera. The planktic assemblages of the Albian and Cenomanian stages are quite distinctive but, while the benthic foraminifera provide little evidence of significant change at the Aptian–Albian boundary, there is a significant turnover at the Cenomanian–Turonian Boundary Event (CTBE).
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