Results 71 to 80 of about 39,707 (262)
The Initial Opening of the Drake Passage Occurred During ca. 62‐59 Ma
Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.Abstract Although the Drake Passage has been considered a critical component of ocean circulation and climate, its initial opening age remains controversial due to the weak constraints on the paleoposition of the Antarctic Peninsula. Here, new zircon U‐Pb geochronological studies are conducted on the Barchans Islands, providing a critical age ...
Liang Gao +16 more
wiley +1 more source
Triassic radiolarian biostratigraphy [PDF]
Geological Society, London, Special Publications, 2010 Abstract This paper summarizes 30 years of research on the biostratigraphy of Triassic radiolarians and presents a correlation of currently-used radiolarian zonations established in North America, Europe, Japan and Far East Russia. An up-to-date stratigraphic distribution of all hitherto described and still valid Triassic genera is provided ...
Špela Goričan +3 more
openaire +2 more sources
The utility of deep-water agglutinated Foraminiferal acmes for correlating Eocene to Oligocene abyssal sediments in the North Atlantic and Western Tethys [PDF]
, 2005 Quantitative analysis of Deep-water Agglutinated Foraminifera (DWAF) assemblages from key ODP sites in the North Atlantic reveal the presence of stratigraphically-significant abundance maxima, that may be useful for correlating sedimentary sequences ...
Kaminski, M.A.
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The Depositional Record, Volume 11, Issue 2, Page 616-636, April 2025.While the Smithian–Spathian boundary carbon isotopic excursion has been traditionally interpreted as capturing global carbon cycle behaviour, recent studies have suggested that at least some Early Triassic carbon isotopic excursions may incorporate influences from authigenic or early diagenetic processes.
Jordan P. Todes +6 more
wiley +1 more source
Paleoceanography and Paleoclimatology, Volume 40, Issue 4, April 2025.Abstract Deep‐sea mud enriched in rare‐earth elements (REE), termed REE‐rich mud, is a promising seafloor mineral resource. Data from a decade of surveys have revealed that the mud with the highest REE concentration occurs in the pelagic realm of the western North Pacific Ocean, with at least two layers of elevated REE concentration.
K. Mimura +6 more
wiley +1 more source
Note complementaire sur les echinodermes ordoviciens de Sierra Morena
Estudios Geologicos, 1986 [fr] Une nouvelle espéce du genre Calix est décrite, le genre Batalleria est redécrit, la présence de Phlyctocystis dans les Monts de Toléde-Sierra Morena est confirmée, et celle de Destombesia est signalée.
J. Chauvel, B. Meléndez
doaj +1 more source
The biostratigraphy of the Albian and Cenomanian succession in the Ventnor No. 2 borehole, Isle of Wight [PDF]
, 2004 This report describes the foraminifera found in the uppermost part of the Gault, Upper Greensand, Glauconitic Marl and West Melbury Marly Chalk of Ventnor No.2 Borehole (the "Carstone of the Isle of Wight" was barren of calcareous microfaunas).
Wilkinson, I.P.
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Paleoceanography and Paleoclimatology, Volume 40, Issue 4, April 2025.Abstract The calcite tests of foraminifera used for reconstructions of past oceanic and climatic conditions are altered after deposition in pelagic sediments by recrystallisation but this process remains poorly understood. To investigate the controls and impacts of recrystallisation we compare laser ablation (LA‐) ICP‐MS‐derived Mg/Ca and Sr/Ca ratio ...
Janett Voigt +3 more
wiley +1 more source
Paleoceanography and Paleoclimatology, Volume 40, Issue 4, April 2025.Abstract The Eastern Equatorial Pacific serves as a critical region for understanding the interplay between phytoplankton dynamics and global carbon cycling over glacial‐interglacial timescales. This study investigates the calcareous nannofossils from sediment core MV1014‐02‐17JC (17JC) and previously published diatom assemblage data from core MD02 ...
John A. Sarao Jr., Denise K. Kulhanek
wiley +1 more source
Middle Darriwilian conodont zones in the uppermost San Juan limestone and the lower member of the Las Aguaditas formation, central Precordillera of San Juan, Argentina [PDF]
, 2013 The geological province of Precordillera is located in western Argentina. It extends 450 km meridionally and 110 km from east to west (Fig. 1) (Furque and Cuerda, 1979).
Albanesi, Guillermo Luis +2 more
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