Articles | Volume 39, issue 1
https://doi.org/10.5194/jm-39-1-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-39-1-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
03 Jan 2020
Research article |
| 03 Jan 2020
| 03 Jan 2020
Organic-walled dinoflagellate cyst biostratigraphy of the upper Eocene to lower Oligocene Yazoo Formation, US Gulf Coast
Marcelo Augusto De Lira Mota
CORRESPONDING AUTHOR
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Birmingham, B15 2TT, UK
Guy Harrington
PetroStrat, Conwy Office, Tan-y-Graig, Parc Caer Seion, Conwy, LL32
8FA, UK
Tom Dunkley Jones
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Birmingham, B15 2TT, UK
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Flavia Boscolo-Galazzo, Amy Jones, Tom Dunkley Jones, Katherine A. Crichton, Bridget S. Wade, and Paul N. Pearson
Biogeosciences, 19, 743–762, https://doi.org/10.5194/bg-19-743-2022, https://doi.org/10.5194/bg-19-743-2022, 2022
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Deep-living organisms are a major yet poorly known component of ocean biomass. Here we reconstruct the evolution of deep-living zooplankton and phytoplankton. Deep-dwelling zooplankton and phytoplankton did not occur 15 Myr ago, when the ocean was several degrees warmer than today. Deep-dwelling species first evolve around 7.5 Myr ago, following global climate cooling. Their evolution was driven by colder ocean temperatures allowing more food, oxygen, and light at depth.
Daniel J. Lunt, Fran Bragg, Wing-Le Chan, David K. Hutchinson, Jean-Baptiste Ladant, Polina Morozova, Igor Niezgodzki, Sebastian Steinig, Zhongshi Zhang, Jiang Zhu, Ayako Abe-Ouchi, Eleni Anagnostou, Agatha M. de Boer, Helen K. Coxall, Yannick Donnadieu, Gavin Foster, Gordon N. Inglis, Gregor Knorr, Petra M. Langebroek, Caroline H. Lear, Gerrit Lohmann, Christopher J. Poulsen, Pierre Sepulchre, Jessica E. Tierney, Paul J. Valdes, Evgeny M. Volodin, Tom Dunkley Jones, Christopher J. Hollis, Matthew Huber, and Bette L. Otto-Bliesner
Clim. Past, 17, 203–227, https://doi.org/10.5194/cp-17-203-2021, https://doi.org/10.5194/cp-17-203-2021, 2021
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This paper presents the first modelling results from the Deep-Time Model Intercomparison Project (DeepMIP), in which we focus on the early Eocene climatic optimum (EECO, 50 million years ago). We show that, in contrast to previous work, at least three models (CESM, GFDL, and NorESM) produce climate states that are consistent with proxy indicators of global mean temperature and polar amplification, and they achieve this at a CO2 concentration that is consistent with the CO2 proxy record.
Tom Dunkley Jones, Yvette L. Eley, William Thomson, Sarah E. Greene, Ilya Mandel, Kirsty Edgar, and James A. Bendle
Clim. Past, 16, 2599–2617, https://doi.org/10.5194/cp-16-2599-2020, https://doi.org/10.5194/cp-16-2599-2020, 2020
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We explore the utiliity of the composition of fossil lipid biomarkers, which are commonly preserved in ancient marine sediments, in providing estimates of past ocean temperatures. The group of lipids concerned show compositional changes across the modern oceans that are correlated, to some extent, with local surface ocean temperatures. Here we present new machine learning approaches to improve our understanding of this temperature sensitivity and its application to reconstructing past climates.
Gordon N. Inglis, Fran Bragg, Natalie J. Burls, Marlow Julius Cramwinckel, David Evans, Gavin L. Foster, Matthew Huber, Daniel J. Lunt, Nicholas Siler, Sebastian Steinig, Jessica E. Tierney, Richard Wilkinson, Eleni Anagnostou, Agatha M. de Boer, Tom Dunkley Jones, Kirsty M. Edgar, Christopher J. Hollis, David K. Hutchinson, and Richard D. Pancost
Clim. Past, 16, 1953–1968, https://doi.org/10.5194/cp-16-1953-2020, https://doi.org/10.5194/cp-16-1953-2020, 2020
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This paper presents estimates of global mean surface temperatures and climate sensitivity during the early Paleogene (∼57–48 Ma). We employ a multi-method experimental approach and show that i) global mean surface temperatures range between 27 and 32°C and that ii) estimates of
bulkequilibrium climate sensitivity (∼3 to 4.5°C) fall within the range predicted by the IPCC AR5 Report. This work improves our understanding of two key climate metrics during the early Paleogene.
Christopher J. Hollis, Tom Dunkley Jones, Eleni Anagnostou, Peter K. Bijl, Marlow Julius Cramwinckel, Ying Cui, Gerald R. Dickens, Kirsty M. Edgar, Yvette Eley, David Evans, Gavin L. Foster, Joost Frieling, Gordon N. Inglis, Elizabeth M. Kennedy, Reinhard Kozdon, Vittoria Lauretano, Caroline H. Lear, Kate Littler, Lucas Lourens, A. Nele Meckler, B. David A. Naafs, Heiko Pälike, Richard D. Pancost, Paul N. Pearson, Ursula Röhl, Dana L. Royer, Ulrich Salzmann, Brian A. Schubert, Hannu Seebeck, Appy Sluijs, Robert P. Speijer, Peter Stassen, Jessica Tierney, Aradhna Tripati, Bridget Wade, Thomas Westerhold, Caitlyn Witkowski, James C. Zachos, Yi Ge Zhang, Matthew Huber, and Daniel J. Lunt
Geosci. Model Dev., 12, 3149–3206, https://doi.org/10.5194/gmd-12-3149-2019, https://doi.org/10.5194/gmd-12-3149-2019, 2019
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The Deep-Time Model Intercomparison Project (DeepMIP) is a model–data intercomparison of the early Eocene (around 55 million years ago), the last time that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Previously, we outlined the experimental design for climate model simulations. Here, we outline the methods used for compilation and analysis of climate proxy data. The resulting climate
atlaswill provide insights into the mechanisms that control past warm climate states.
Zainab Al Rawahi and Tom Dunkley Jones
J. Micropalaeontol., 38, 25–54, https://doi.org/10.5194/jm-38-25-2019, https://doi.org/10.5194/jm-38-25-2019, 2019
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This research studies nannofossils (microscopic fossil remains of unicellular marine planktonic algae) recovered from the Late Cretaceous, pelagic shale Fiqa Formation of Oman. The study emphasises taxonomy and assemblage change application to understand changes in the past climate and environment during the time of deposition. This has been achieved by analysing rock samples under the microscope. The analysis of these fossils could be applied in future work for age determination.
Tom Dunkley Jones, Hayley R. Manners, Murray Hoggett, Sandra Kirtland Turner, Thomas Westerhold, Melanie J. Leng, Richard D. Pancost, Andy Ridgwell, Laia Alegret, Rob Duller, and Stephen T. Grimes
Clim. Past, 14, 1035–1049, https://doi.org/10.5194/cp-14-1035-2018, https://doi.org/10.5194/cp-14-1035-2018, 2018
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The Paleocene–Eocene Thermal Maximum (PETM) is a transient global warming event associated with a doubling of atmospheric carbon dioxide concentrations. Here we document a major increase in sediment accumulation rates on a subtropical continental margin during the PETM, likely due to marked changes in hydro-climates and sediment transport. These high sedimentation rates persist through the event and may play a key role in the removal of carbon from the atmosphere by the burial of organic carbon.
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Frida S. Hoem, Karlijn van den Broek, Adrián López-Quirós, Suzanna H. A. van de Lagemaat, Steve M. Bohaty, Claus-Dieter Hillenbrand, Robert D. Larter, Tim E. van Peer, Henk Brinkhuis, Francesca Sangiorgi, and Peter K. Bijl
J. Micropalaeontol., 43, 497–517, https://doi.org/10.5194/jm-43-497-2024, https://doi.org/10.5194/jm-43-497-2024, 2024
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The timing and impact of onset of Antarctic Circumpolar Current (ACC) on climate and Antarctic ice are unclear. We reconstruct late Eocene to Miocene southern Atlantic surface ocean environment using microfossil remains of dinoflagellates (dinocysts). Our dinocyst records shows the breakdown of subpolar gyres in the late Oligocene and the transition into a modern-like oceanographic regime with ACC flow, established frontal systems, Antarctic proximal cooling, and sea ice by the late Miocene.
Carolina Klock, André Desrochers, Patrick I. McLaughlin, Poul Emsbo, Tim De Backer, Fien M. Jonckheere, Cristiana J. P. Esteves, and Thijs R. A. Vandenbroucke
J. Micropalaeontol., 43, 475–495, https://doi.org/10.5194/jm-43-475-2024, https://doi.org/10.5194/jm-43-475-2024, 2024
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Anticosti Island has a well-preserved rock succession throughout the Aeronian–Telychian boundary in the Llandovery Epoch, Silurian period, which includes two important biogeochemical events, the late Aeronian and the Valgu. This study suggests the position of this boundary in Anticosti based on the correlation of the island’s chitinozoan assemblages with the global occurrences, confirming both a remarkable preservation of upper Aeronian rocks and the record of the Valgu event.
Appy Sluijs and Henk Brinkhuis
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Peter K. Bijl and Henk Brinkhuis
J. Micropalaeontol., 42, 309–314, https://doi.org/10.5194/jm-42-309-2023, https://doi.org/10.5194/jm-42-309-2023, 2023
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We developed an online, open-access database for taxonomic descriptions, stratigraphic information and images of organic-walled dinoflagellate cyst species. With this new resource for applied and academic research, teaching and training, we open up organic-walled dinoflagellate cysts for the academic era of open science. We expect that palsys.org represents a starting point to improve taxonomic concepts, and we invite the community to contribute.
Mallory Pilie, Martha E. Gibson, Ingrid C. Romero, Noelia B. Nuñez Otaño, Matthew J. Pound, Jennifer M. K. O'Keefe, and Sophie Warny
J. Micropalaeontol., 42, 291–307, https://doi.org/10.5194/jm-42-291-2023, https://doi.org/10.5194/jm-42-291-2023, 2023
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The ANDRILL SMS site provides the first Middle Miocene Antarctic fungal record. The CREST plant-based paleoclimate reconstructions confirm an intensification of the hydrological cycle during the MCO, with the Ross Sea region reconstructed 279 % wetter than modern conditions and a maximum mean annual temperature of 10.3 °C for the warmest intervals of the MCO. The plant-based reconstructions indicate a temperate, no dry season with a warm summer (Cfb) Köppen–Geiger climate classification.
Yord W. Yedema, Timme Donders, Francien Peterse, and Francesca Sangiorgi
J. Micropalaeontol., 42, 257–276, https://doi.org/10.5194/jm-42-257-2023, https://doi.org/10.5194/jm-42-257-2023, 2023
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The pollen and dinoflagellate cyst content of 21 surface sediments from the northern Gulf of Mexico is used to test the applicability of three palynological ratios (heterotroph/autotroph, pollen/dinocyst, and pollen/bisaccate ratio) as proxies for marine productivity and distance to the coast/river. Redundancy analysis confirms the suitability of these three ratios, where the H/A ratio can be used as an indicator of primary production, and the P/B ratio best tracks the distance to the coast.
Lena Mareike Thöle, Peter Dirk Nooteboom, Suning Hou, Rujian Wang, Senyan Nie, Elisabeth Michel, Isabel Sauermilch, Fabienne Marret, Francesca Sangiorgi, and Peter Kristian Bijl
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Dinoflagellate cysts can be used to infer past oceanographic conditions in the Southern Ocean. This requires knowledge of their present-day ecologic affinities. We add 66 Antarctic-proximal surface sediment samples to the Southern Ocean data and derive oceanographic conditions at those stations. Dinoflagellate cysts are clearly biogeographically separated along latitudinal gradients of temperature, sea ice, nutrients, and salinity, which allows us to reconstruct these parameters for the past.
Frida S. Hoem, Isabel Sauermilch, Suning Hou, Henk Brinkhuis, Francesca Sangiorgi, and Peter K. Bijl
J. Micropalaeontol., 40, 175–193, https://doi.org/10.5194/jm-40-175-2021, https://doi.org/10.5194/jm-40-175-2021, 2021
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We use marine microfossil (dinocyst) assemblage data as well as seismic and tectonic investigations to reconstruct the oceanographic history south of Australia 37–20 Ma as the Tasmanian Gateway widens and deepens. Our results show stable conditions with typically warmer dinocysts south of Australia, which contrasts with the colder dinocysts closer to Antarctica, indicating the establishment of modern oceanographic conditions with a strong Southern Ocean temperature gradient and frontal systems.
Manuel Vieira and Salih Mahdi
J. Micropalaeontol., 39, 155–167, https://doi.org/10.5194/jm-39-155-2020, https://doi.org/10.5194/jm-39-155-2020, 2020
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This paper describes a new species of the genus Desmocysta from the Late Cretaceous in the Norwegian Sea. The short stratigraphic range for this new species makes it a good biostratigraphic marker. The available published data also indicate that this genus is restricted to higher latitudes in the Northern Hemisphere and is suggested to have preferred turbid waters and stressed marine environments.
Kasia K. Śliwińska and Martin J. Head
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We described two new species of the fossil dinoflagellate cyst genus Svalbardella. S. clausii sp. nov. has a narrow range in the lowermost Chattian and may be related to cooler surface waters. S. kareniae sp. nov. ranges from Lower Oligocene to Lower Miocene and favours more open marine conditions.
Our study illustrates the close phylogenetic relationship between Svalbardella and Palaeocystodinium and shows that surface ornamentation and the tabulation are variable features within both genera.
Kasia K. Śliwińska
J. Micropalaeontol., 38, 143–176, https://doi.org/10.5194/jm-38-143-2019, https://doi.org/10.5194/jm-38-143-2019, 2019
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This study provides an age model based on dinocysts for the early Oligocene succession from the North Sea. The changes in the dinocysts assemblage show that the succession was deposited in a proximal and dynamic environment. Furthermore, the results suggests that the early icehouse climate played an important role in the depositional development of the Oligocene succession in the North Sea basin.
Phillip E. Jardine, William D. Gosling, Barry H. Lomax, Adele C. M. Julier, and Wesley T. Fraser
J. Micropalaeontol., 38, 83–95, https://doi.org/10.5194/jm-38-83-2019, https://doi.org/10.5194/jm-38-83-2019, 2019
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Many major food crops, including rice, wheat, maize, rye, barley, oats and millet, are domesticated species of grass. However, because grass pollen all looks highly similar, it has been challenging to track grass domestication using pollen in archaeological samples. Here, we show that we can use the chemical signature of pollen grains to classify different grass species. This approach has the potential to help unravel the spread of domestication and agriculture over the last 10 000 years.
Thomas M. Hoyle, Manuel Sala-Pérez, and Francesca Sangiorgi
J. Micropalaeontol., 38, 55–65, https://doi.org/10.5194/jm-38-55-2019, https://doi.org/10.5194/jm-38-55-2019, 2019
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Morphology of dinoflagellate cysts (which are valuable tools in deciphering past environmental and climate changes) depends not only on genetics, but also on a range of environmental factors. We review frequently occurring (Black Sea) morphotypes and propose use of matrices to record gradual variation between endmember forms as a pragmatic approach until cyst–theca studies and genetic sequencing can demonstrate relationships between genetically and environmentally controlled morphotypes.
Sonal Khanolkar and Jyoti Sharma
J. Micropalaeontol., 38, 1–24, https://doi.org/10.5194/jm-38-1-2019, https://doi.org/10.5194/jm-38-1-2019, 2019
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We carried out comparative analyses of multiple microfossil groups like foraminifera, dinoflagellates, pollen and spores from Early and Middle Eocene lignite mine sections from paleotropical sites of the Cambay, Kutch and Barmer basins of western India in order to record the changes in paleovegetation and paleodepositional conditions during the hot and humid climate.
Julian D. Hartman, Peter K. Bijl, and Francesca Sangiorgi
J. Micropalaeontol., 37, 445–497, https://doi.org/10.5194/jm-37-445-2018, https://doi.org/10.5194/jm-37-445-2018, 2018
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We present an extensive overview of the organic microfossil remains found at Site U1357, Adélie Basin, East Antarctica. The organic microfossil remains are exceptionally well preserved and are derived from unicellular as well as higher organisms. We provide a morphological description, photographic images, and a discussion of the ecological preferences of the biological species from which the organic remains were derived.
Peter K. Bijl, Alexander J. P. Houben, Anja Bruls, Jörg Pross, and Francesca Sangiorgi
J. Micropalaeontol., 37, 105–138, https://doi.org/10.5194/jm-37-105-2018, https://doi.org/10.5194/jm-37-105-2018, 2018
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In order to use ocean sediments as a recorder of past oceanographic changes, a critical first step is to stratigraphically date the sediments. The absence of microfossils with known stratigraphic ranges has always hindered dating of Southern Ocean sediments. Here we tie dinocyst ranges to the international timescale in a well-dated sediment core from offshore Antarctica. With this, we can now use dinocysts as a biostratigraphic tool in otherwise stratigraphically poorly dated sediments.
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Short summary
New high-resolution microfossil record from a clay succession in the US Gulf Coastal Plain reveal more accurate age estimates for the critical Eocene–Oligocene transition (EOT), a global climate event marked by the rapid expansion of the first permanent Antarctic ice sheet 34 million years ago. These data suggest a coeval major increase in sedimentation rate. Future isotopic and palaeoecological work on this core can be more precisely integrated with other global records of the EOT.
New high-resolution microfossil record from a clay succession in the US Gulf Coastal Plain...
