Results 91 to 100 of about 21,261 (211)

Intermediate Western Boundary Current speeds from the southeastern Brazilian margin: A 16,000‐year record from grain‐size evidence

Limnology and Oceanography Letters, Volume 11, Issue 2, March 2026.
Abstract This study presents a high‐resolution reconstruction of the Antarctic Intermediate Water (AAIW) transport variability on the southeastern Brazilian continental margin over the last 16,000 years BP, based on grain‐size analysis. Variations of sortable silt (SS¯$$ \overline{SS} $$) are interpreted as changes in flow speed of the Intermediate ...
Júlia Sambugaro, Michel Michaelovitch de Mahiques, Silvia Helena de Mello e Sousa   +2 more
wiley   +1 more source

New vertebrate microfossils expand the diversity of the chondrichthyan and actinopterygian fauna of the Maastrichtian–Danian Hornerstown Formation in New Jersey [PDF]

Acta Palaeontologica Polonica
The abundance of shark and actinopterygian fossils in the Cretaceous and Paleogene strata of the Atlantic Coastal Plain is well documented; but much remains unknown about the survivorship patterns of these major components of shallow marine faunas in the
ZACHARY M. BOLES, PAUL V. ULLMANN, IAN PUTNAM, MARIELE FORD, JOSEPH T. DECKHUT   +4 more
doaj   +1 more source

Diagenetic Effect on Planktic Foraminiferal Mg/Ca Records in the Arctic Ocean

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Mg/Ca ratios in planktic foraminifera have long been used as a thermometer to reconstruct the past climate. However, this study revealed that in certain intervals, the Mg/Ca ratios of the planktic foraminifer Neogloboquadrina pachyderma, a widespread species in the Arctic Ocean, displayed anomalously high values which could severely bias paleo‐
B.‐J. Jong, L. Lo, Y. Iizuka, C.‐C. Shen, C.‐K. Chuang, A. Bahr, H.‐S. Mii, H.‐C. Li, L. Löwemark   +8 more
wiley   +1 more source

The study of the umbilical system in planktonic foraminifera in relation with depth of the Ziarat-kola section at the Maastrichtian, Central Alborz, IRAN [PDF]

, 2009
The main aim of this research is study of the planktonic foraminifera morphogroups distinction genus to perform by changing the umbilicus area in Ziarat-kola section to find novel results.
Behnaz Balmaki, Massod Asgharian, Meysam Shafiee Ardestani   +2 more
core   +1 more source

Biotic and abiotic processes in Ediacaran spheroid formation

Frontiers in Earth Science
Organic-rich shales from the uppermost Doushantuo Fm. (South China) record one of the most negative carbonate carbon isotopic excursions in Earth’s history, known as the Shuram excursion, and contain meter to micro-size spheroids.
Fuencisla Cañadas, Dominic Papineau, Dominic Papineau, Dominic Papineau, Dominic Papineau, Zhenbing She, Zhenbing She   +6 more
doaj   +1 more source

Terrestrial Ecosystem Response to Changing Temperature and Seasonality in the Paleocene‐Eocene Thermal Maximum: Shallow Marine Records From the Salisbury Embayment, USA

Paleoceanography and Paleoclimatology, Volume 41, Issue 3, March 2026.
Abstract The Paleocene‐Eocene thermal maximum (PETM, ∼56 Ma) is marked by a massive and rapid rise in atmospheric CO2 and ∼5°C of global warming. It is globally characterized by a negative carbon isotope excursion (CIE), and, at least locally, is preceded by a pre‐onset excursion (POE).
Debra A. Willard, Mei Nelissen, Appy Sluijs, Henk Brinkhuis, Tammo Reichgelt, Marci Robinson, Jean M. Self‐Trail   +6 more
wiley   +1 more source

Palaeobathymetry of the Abderaz Formation using foraminifera, Iran [PDF]

, 2009
Abderaz Formation at its type section with an age of Turonian-early Campanian and a thickness of 300 m contains light grey shale and marl. The study of the planktonic foraminifera in isolated form led to differentiate three morphotype groups.
Ebrahim Ghasemi-Nejad, Meysam Shafiee Ardestani   +1 more
core   +1 more source

Lower Glacial Oxygen in the Eastern Equatorial Pacific Concentrated in the Deep Sea

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Oxygen in the global oceans has declined since the 1960s, including in the Eastern Equatorial Pacific (EEP). Reconstructions of EEP glacial oxygenation help advance understanding of current and projected ocean deoxygenation. Previous estimates of the glacial oxygen deficient zones (ODZs) in the upper EEP are poorly constrained. Here we include
Wanyi Lu, Delia W. Oppo, Xiaoying Jiang, Haowen Dang, Zhimin Jian   +4 more
wiley   +1 more source

Unraveling the Enrichment Mechanisms of Rare Earth Elements in Deep‐Sea Sediments: An Environmental Magnetic Perspective

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Deep‐sea rare earth elements and yttrium (REY)‐rich sediments have attracted considerable attention since their discovery in 2011. However, the environmental factors controlling REY enrichment remain poorly understood, largely because paleoceanographic proxies are absent in pelagic clays.
Xiangfeng He, Jianxing Liu, Dongjie Bi, Yamin Zhang, Mu Huang, Miao Yu, Fengdeng Shi, Jianhua Gao, Xuefa Shi   +8 more
wiley   +1 more source

Expedition 306 summary

, 2006
The overall aim of the North Atlantic paleoceanography study of Integrated Ocean Drilling Program Expedition 306 is to place late Neogene–Quaternary climate proxies in the North Atlantic into a chronology based on a combination of geomagnetic ...
Aboud, Essam, Acton, Gary D., Akimoto, Kazumi, Alvarez Zarikian, Carlos A., Bailey, Ian, Bjørklund, Kjell R., Evans, Helen, Fang, Nianqiao, Ferretti, Patrizia, Gruetzner, Jens, Guyodo, Yohan J.B., Hagino, Kyoko, Harris, Robert, Hatakeda, Kentaro, Hefter, Jens Norbert, Higgins, Sean M., Judge, Shelley A., Kanamatsu, Toshiya, Kulhanek, Denise K., Nanayama, Futoshi, Nielsen, Simon H.H., Ohno, Masao, Rashid, Harunur, Sierro Sanchez, Francisco J., Stein, Ruediger, Voelker, Antje, Zhai, Qiumin   +26 more
core   +1 more source