Articles | Volume 40, issue 1
https://doi.org/10.5194/jm-40-1-2021
© Author(s) 2021. This work is distributed under
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the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-40-1-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
27 Jan 2021
Research article |
| 27 Jan 2021
| 27 Jan 2021
Jurassic planktic foraminifera from the Polish Basin
Maria Gajewska
University of Warsaw, Faculty of Geology, al. Żwirki i Wigury 93, 02-089 Warsaw, Poland
University of Warsaw, Faculty of Geology, al. Żwirki i Wigury 93, 02-089 Warsaw, Poland
Malcolm B. Hart
School of Geography, Earth & Environmental Sciences, University of
Plymouth, Drake Circus, Plymouth PL4 8AA, UK
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Around 70 million years ago, during the Late Cretaceous, Earth’s climate was undergoing long-term cooling despite high CO₂ levels. Using an advanced temperature reconstruction technique, we analyzed foraminifer fossils from the European Chalk Sea. Our results show highly variable surface waters, likely influenced by freshwater inputs or upwelling, while deeper waters remained warm and stable, possibly influenced by shifting ocean currents. This improves our understanding of past ocean dynamics.
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<p>In the 1960s-1970s some species of Triassic foraminifera were described as having a planktic mode of life. This was questioned and Malcolm Hart studied the material in Vienna, taking some to London for SEM imaging. Samples collected from Poland are compared to these images and the suggested planktic mode of life discussed. Foraminifera collected in Ogrodzieniec are glauconitic steinkerns with no test material present and none of the diagnostic features needed to determine "new" species.</p>
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Benthic foraminifera play a significant role in modern reefal ecosystems mainly due to their symbiosis with photosynthetic microorganisms. Foraminifera were also components of Devonian stromatoporoid coral reefs; however, whether they could have harbored symbionts has remained unclear. We show that Devonian foraminifera may have stayed photosynthetically active, which likely had an impact on their evolutionary radiation and possibly also on the functioning of Paleozoic shallow marine ecosystems.
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