JM - recent articles
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Recent articles of the journal Journal of MicropalaeontologyRadiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast
https://doi.org/10.5194/jm-43-37-2024
<b>Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast</b><br>
Mutsumi Iizuka, Takuya Itaki, Osamu Seki, Ryosuke Makabe, Motoha Ojima, and Shigeru Aoki<br>
J. Micropalaeontol., 43, 37–53, https://doi.org/10.5194/jm-43-37-2024, 2024<br>
Radiolarian fossils are valuable tools for understanding water mass distribution. However, they have not been used in the high-latitude Southern Ocean due to unclear radiolarian assemblages. Our study identifies four assemblages related to water masses and ice edge environments in the high-latitude Southern Ocean, offering insights for water mass reconstruction in this region.
2024-01-24T11:40:45+01:00Late Miocene to Early Pliocene benthic foraminifera from the Tasman Sea (International Ocean Discovery Program Site U1506)
https://doi.org/10.5194/jm-43-1-2024
<b>Late Miocene to Early Pliocene benthic foraminifera from the Tasman Sea (International Ocean Discovery Program Site U1506)</b><br>
Maria Elena Gastaldello, Claudia Agnini, and Laia Alegret<br>
J. Micropalaeontol., 43, 1–35, https://doi.org/10.5194/jm-43-1-2024, 2024<br>
This paper examines benthic foraminifera, single-celled organisms, at Integrated Ocean Drilling Program Site U1506 in the Tasman Sea from the Late Miocene to the Early Pliocene (between 7.4 to 4.5 million years ago). We described and illustrated the 36 most common species; analysed the past ocean depth of the site; and investigated the environmental conditions at the seafloor during the Biogenic Bloom phenomenon, a global phase of high marine primary productivity.
2024-01-05T11:40:45+01:00Palsys.org: an open-access taxonomic and stratigraphic database of organic-walled dinoflagellate cysts
https://doi.org/10.5194/jm-42-309-2023
<b>Palsys.org: an open-access taxonomic and stratigraphic database of organic-walled dinoflagellate cysts</b><br>
Peter K. Bijl and Henk Brinkhuis<br>
J. Micropalaeontol., 42, 309–314, https://doi.org/10.5194/jm-42-309-2023, 2023<br>
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.
2023-12-19T11:40:45+01:00Miocene Climatic Optimum fungal record and plant-based CREST climatic reconstruction from southern McMurdo Sound, Antarctica
https://doi.org/10.5194/jm-42-291-2023
<b>Miocene Climatic Optimum fungal record and plant-based CREST climatic reconstruction from southern McMurdo Sound, Antarctica</b><br>
Mallory Pilie, Martha E. Gibson, Ingrid C. Romero, Noelia B. Nuñez Otaño, Matthew J. Pound, Jennifer M. K. O'Keefe, and Sophie Warny<br>
J. Micropalaeontol., 42, 291–307, https://doi.org/10.5194/jm-42-291-2023, 2023<br>
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.
2023-12-18T11:40:45+01:00Triassic and Jurassic possible planktonic foraminifera and the assemblages recovered from the Ogrodzieniec Glauconitic Marls Formation (uppermost Callovian and lowermost Oxfordian, Jurassic) of the Polish Basin
https://doi.org/10.5194/jm-42-277-2023
<b>Triassic and Jurassic possible planktonic foraminifera and the assemblages recovered from the Ogrodzieniec Glauconitic Marls Formation (uppermost Callovian and lowermost Oxfordian, Jurassic) of the Polish Basin</b><br>
Malcolm B. Hart, Holger Gebhardt, Eiichi Setoyama, Christopher W. Smart, and Jarosław Tyszka<br>
J. Micropalaeontol., 42, 277–290, https://doi.org/10.5194/jm-42-277-2023, 2023<br>
<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>
2023-12-08T11:40:45+01:00Dinoflagellate cyst and pollen assemblages as tracers for marine productivity and river input in the northern Gulf of Mexico
https://doi.org/10.5194/jm-42-257-2023
<b>Dinoflagellate cyst and pollen assemblages as tracers for marine productivity and river input in the northern Gulf of Mexico</b><br>
Yord W. Yedema, Timme Donders, Francien Peterse, and Francesca Sangiorgi<br>
J. Micropalaeontol., 42, 257–276, https://doi.org/10.5194/jm-42-257-2023, 2023<br>
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.
2023-11-27T11:40:45+01:00Biochronology and evolution of Pulleniatina (planktonic foraminifera)
https://doi.org/10.5194/jm-42-211-2023
<b>Biochronology and evolution of Pulleniatina (planktonic foraminifera)</b><br>
Paul N. Pearson, Jeremy Young, David J. King, and Bridget S. Wade<br>
J. Micropalaeontol., 42, 211–255, https://doi.org/10.5194/jm-42-211-2023, 2023<br>
Planktonic foraminifera are marine plankton that have a long and continuous fossil record. They are used for correlating and dating ocean sediments and studying evolution and past climates. This paper presents new information about Pulleniatina, one of the most widespread and abundant groups, from an important site in the Pacific Ocean. It also brings together a very large amount of information on the fossil record from other sites globally.
2023-11-22T11:40:45+01:00Anagenetic evolution and peramorphosis of a latest Devonian conodont from Holy Cross Mountain (Poland)
https://doi.org/10.5194/jm-42-193-2023
<b>Anagenetic evolution and peramorphosis of a latest Devonian conodont from Holy Cross Mountain (Poland)</b><br>
Przemysław Świś<br>
J. Micropalaeontol., 42, 193–210, https://doi.org/10.5194/jm-42-193-2023, 2023<br>
Pseudopolygnathus marburgensis marburgensis and Pseudopolygnathus marburgensis trigonicus were believed to be different conodont subspecies. However, paleontological data indicate those two are stages of evolution of a single lineage. Research is also focused on evolutionary changing of appearance and evolution of growth and development calibrated precisely with incremental layers. This study could have potential influence on dating Late Devonian rocks based on evolutionary transformations.
2023-11-20T11:40:45+01:00Benthic foraminiferal patchiness – revisited
https://doi.org/10.5194/jm-42-171-2023
<b>Benthic foraminiferal patchiness – revisited</b><br>
Joachim Schönfeld, Nicolaas Glock, Irina Polovodova Asteman, Alexandra-Sophie Roy, Marié Warren, Julia Weissenbach, and Julia Wukovits<br>
J. Micropalaeontol., 42, 171–192, https://doi.org/10.5194/jm-42-171-2023, 2023<br>
Benthic organisms show aggregated distributions due to the spatial heterogeneity of niches or food. We analysed the distribution of Globobulimina turgida in the Gullmar Fjord, Sweden, with a data–model approach. The population densities did not show any underlying spatial structure but a random log-normal distribution. A temporal data series from the same site depicted two cohorts of samples with high or low densities, which represent hypoxic or well-ventilated conditions in the fjord.
2023-11-03T11:40:45+01:00Bio-sequence stratigraphy of the Neogene: an example from El-Wastani gas field, onshore Nile Delta, Egypt
https://doi.org/10.5194/jm-42-147-2023
<b>Bio-sequence stratigraphy of the Neogene: an example from El-Wastani gas field, onshore Nile Delta, Egypt</b><br>
Ramadan M. El-Kahawy, Nabil Aboul-Ela, Ahmed N. El-Barkooky, and Walid G. Kassab<br>
J. Micropalaeontol., 42, 147–169, https://doi.org/10.5194/jm-42-147-2023, 2023<br>
In this biostratigraphic study of the Middle Miocene–Early Pliocene sequence in the El-Wastani gas field, Egypt, microscopic inspection of the samples enabled the designation of six foraminiferal zones and subzones. Seven stratigraphic sequences have been identified based on the foraminiferal and calcareous nannofossil diversity. Depositional sequences and sequence boundaries are recognized by the integration between the seismic data, biostratigraphic zones, and wireline logs (gamma rays).
2023-10-04T11:40:45+02:00Agglutinated foraminifera from the Turonian–Coniacian boundary interval in Europe – paleoenvironmental remarks and stratigraphy
https://doi.org/10.5194/jm-42-117-2023
<b>Agglutinated foraminifera from the Turonian–Coniacian boundary interval in Europe – paleoenvironmental remarks and stratigraphy</b><br>
Richard M. Besen, Kathleen Schindler, Andrew S. Gale, and Ulrich Struck<br>
J. Micropalaeontol., 42, 117–146, https://doi.org/10.5194/jm-42-117-2023, 2023<br>
Turonian–Coniacian agglutinated foraminiferal assemblages from calcareous deposits from the temperate European shelf realm were studied. Acmes of agglutinated foraminifera correlate between different sections and can be used for paleoenvironmental analysis expressing inter-regional changes. Agglutinated foraminiferal morphogroups display a gradual shift from Turonian oligotrophic environments towards more mesotrophic conditions in the latest Turonian and Coniacian.
2023-09-22T11:40:45+02:00Paleoenvironmental changes related to the variations of the sea-ice cover during the Late Holocene in an Antarctic fjord (Edisto Inlet, Ross Sea) inferred by foraminiferal association
https://doi.org/10.5194/jm-42-95-2023
<b>Paleoenvironmental changes related to the variations of the sea-ice cover during the Late Holocene in an Antarctic fjord (Edisto Inlet, Ross Sea) inferred by foraminiferal association</b><br>
Giacomo Galli, Caterina Morigi, Romana Melis, Alessio Di Roberto, Tommaso Tesi, Fiorenza Torricella, Leonardo Langone, Patrizia Giordano, Ester Colizza, Lucilla Capotondi, Andrea Gallerani, and Karen Gariboldi<br>
J. Micropalaeontol., 42, 95–115, https://doi.org/10.5194/jm-42-95-2023, 2023<br>
A sediment core was analysed, focusing over the 2000 years, in Edisto Inlet. Benthic and planktic foraminifera were picked and used to determine changes in the faunal composition. Using other nearby cores, by comparing different proxies, we were able to identify a succession of three different environmental phases over the studied period: a seasonal-cycle phase (from 2000 to around 1500 years BP), a transitional phase (from 1500 to 700 years BP) and a cold phase (from 700 years to present).
2023-09-13T11:40:45+02:00Artifacts resembling Ediacaran or Cambrian fossils: how to identify them and avoid their generation
https://doi.org/10.5194/jm-42-83-2023
<b>Artifacts resembling Ediacaran or Cambrian fossils: how to identify them and avoid their generation</b><br>
Thiago F. Toniolo, Juliana M. Leme, Dermeval A. Carmo, Thomas R. Fairchild, Luana Morais, and Ricardo I. F. Trindade<br>
J. Micropalaeontol., 42, 83–93, https://doi.org/10.5194/jm-42-83-2023, 2023<br>
The early fossils of animals with an exoskeleton witness a key episode in the evolution of life. These fossils, such as the cloudinids, have tubular shapes and an uncertain affinity. The reaction between H2O2 and pyrite can lead to the generation of objects very similar to these fossils. For this reason, the method of rock preparation is a cause for concern. Besides discussing methodology, this work provides criteria to distinguish artifacts from fossils based on their composition and structure.
2023-08-18T11:40:45+02:00Globigerinoides rublobatus – a new species of Pleistocene planktonic foraminifera
https://doi.org/10.5194/jm-42-57-2023
<b>Globigerinoides rublobatus – a new species of Pleistocene planktonic foraminifera</b><br>
Marcin Latas, Paul N. Pearson, Christopher R. Poole, Alessio Fabbrini, and Bridget S. Wade<br>
J. Micropalaeontol., 42, 57–81, https://doi.org/10.5194/jm-42-57-2023, 2023<br>
Planktonic foraminifera are microscopic single-celled organisms populating world oceans. They have one of the most complete fossil records; thanks to their great abundance, they are widely used to study past marine environments. We analysed and measured series of foraminifera shells from Indo-Pacific sites, which led to the description of a new species of fossil planktonic foraminifera. Part of its population exhibits pink pigmentation, which is only the third such case among known species.
2023-07-17T11:40:45+02:00An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities
https://doi.org/10.5194/jm-42-35-2023
<b>An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities</b><br>
Lena Mareike Thöle, Peter Dirk Nooteboom, Suning Hou, Rujian Wang, Senyan Nie, Elisabeth Michel, Isabel Sauermilch, Fabienne Marret, Francesca Sangiorgi, and Peter Kristian Bijl<br>
J. Micropalaeontol., 42, 35–56, https://doi.org/10.5194/jm-42-35-2023, 2023<br>
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.
2023-06-02T11:40:45+02:00Reply to Fordham and Welter-Schultes's comment on “Taxonomic review of living planktonic foraminifera” by Brummer and Kučera (2022)
https://doi.org/10.5194/jm-42-33-2023
<b>Reply to Fordham and Welter-Schultes's comment on “Taxonomic review of living planktonic foraminifera” by Brummer and Kučera (2022)</b><br>
Michal Kučera and Geert-Jan A. Brummer<br>
J. Micropalaeontol., 42, 33–34, https://doi.org/10.5194/jm-42-33-2023, 2023<br>
2023-05-16T11:40:45+02:00Comment on “Taxonomic review of living planktonic foraminifera” by Brummer and Kučera (2022)
https://doi.org/10.5194/jm-42-31-2023
<b>Comment on “Taxonomic review of living planktonic foraminifera” by Brummer and Kučera (2022)</b><br>
Barry G. Fordham and Francisco W. Welter-Schultes<br>
J. Micropalaeontol., 42, 31–32, https://doi.org/10.5194/jm-42-31-2023, 2023<br>
2023-05-16T11:40:45+02:00Late Holocene pteropod distribution across the base of the south-eastern Mediterranean margin: the importance of the > 63 µm fraction
https://doi.org/10.5194/jm-42-13-2023
<b>Late Holocene pteropod distribution across the base of the south-eastern Mediterranean margin: the importance of the > 63 µm fraction</b><br>
Valentina Beccari, Ahuva Almogi-Labin, Daniela Basso, Giuliana Panieri, Yizhaq Makovsky, Irka Hajdas, and Silvia Spezzaferri<br>
J. Micropalaeontol., 42, 13–29, https://doi.org/10.5194/jm-42-13-2023, 2023<br>
Planktonic gastropods (pteropods and heteropods) have been investigated in cores collected in the eastern Mediterranean along the Israeli coast in coral, pockmark, and channel areas. The sediment spans the last 5300 years. Our study reveals that neglecting the smaller fraction (> 63 µm) may result in a misinterpretation of the palaeoceanography. The presence of tropical and subtropical species reveals that the eastern Mediterranean acted as a refugium for these organisms.
2023-03-17T11:40:45+01:00Revisiting Early Jurassic Biscutaceae: Similiscutum giganteum sp. nov.
https://doi.org/10.5194/jm-42-1-2023
<b>Revisiting Early Jurassic Biscutaceae: Similiscutum giganteum sp. nov.</b><br>
Samuel Mailliot, Emanuela Mattioli, Micaela Chaumeil Rodríguez, and Bernard Pittet<br>
J. Micropalaeontol., 42, 1–12, https://doi.org/10.5194/jm-42-1-2023, 2023<br>
Using biometric analysis, a new species, Similiscutum giganteum, has been described. Given its distinctive morphology and its stratigraphic range restricted to upper Pliensbachian and Toarcian, the potential stratigraphic use of this new species has to be explored. A method for biometry is also described in detail. This paper proves the value of biometric analysis in taxonomic description.
2023-03-03T11:40:45+01:00Artificial intelligence applied to the classification of eight middle Eocene species of the genus Podocyrtis (polycystine radiolaria)
https://doi.org/10.5194/jm-41-165-2022
<b>Artificial intelligence applied to the classification of eight middle Eocene species of the genus Podocyrtis (polycystine radiolaria)</b><br>
Veronica Carlsson, Taniel Danelian, Pierre Boulet, Philippe Devienne, Aurelien Laforge, and Johan Renaudie<br>
J. Micropalaeontol., 41, 165–182, https://doi.org/10.5194/jm-41-165-2022, 2022<br>
This study evaluates the use of automatic classification using AI on eight closely related radiolarian species of the genus Podocyrtis based on MobileNet CNN. Species belonging to Podocyrtis are useful for middle Eocene biostratigraphy. Numerous images of Podocyrtis species from the tropical Atlantic Ocean were used to train and validate the CNN. An overall accuracy of about 91 % was obtained. Additional Podocyrtis specimens from other ocean realms were used to test the predictive model.
2022-11-04T11:40:45+01:00