Results 61 to 70 of about 41,365 (200)

Flux and Isotopic Composition of Sedimentary Carbon Subducting Along the World's Trenches

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Here we provide comprehensive estimates for the subducted sedimentary flux of inorganic and organic carbon and δ13C at 16 trench segments worldwide. Our calculations provide minimum (incoming sediment), maximum (trench fill) and best estimates (underthrust) of carbon fluxes.
Terry Plank, Alberto Malinverno
wiley   +1 more source

The 3D submicron-scale skeletal reconstruction of Nannoconus (Cretaceous calcareous nannofossil) – Insights into biomineralization [PDF]

Biogeosciences
Nannoconus (∼ 5–20 µm) was a major planktonic producer in the Early Cretaceous seas (∼ 150–120 Ma). The heavy calcitic skeletons (micaliths; ∼ 200–1400 picogram) of this extinct nannoplankton genus have contributed to massive carbonate accumulations for ...
R. Chowdhury, R. Chowdhury, R. Chowdhury, R. Boudjehem, B. Suchéras-Marx, M. Dupraz, A. Kulow, J. C. da Silva, J. L. Hazemann, M.-P. Aubry, J. Pérez, A. Fernandez-Martinez, F. Giraud   +12 more
doaj   +1 more source

Stable isotope and calcareous nannofossil assemblage record of the late Paleocene and early Eocene (Cicogna section) [PDF]

Climate of the Past, 2016
We present records of stable carbon and oxygen isotopes, CaCO3 content, and changes in calcareous nannofossil assemblages across an 81 m thick section of upper Paleocene–lower Eocene marine sedimentary rocks now exposed along the Cicogna Stream in ...
C. Agnini, D. J. A. Spofforth, G. R. Dickens, D. Rio, H. Pälike, J. Backman, G. Muttoni, E. Dallanave   +7 more
doaj   +1 more source

Eocene belemnites from Hungary

Papers in Palaeontology, Volume 12, Issue 2, March/April 2026.
Abstract The Middle Eocene nummulitic limestone at Dudar, Transdanubian Hungary, has yielded several belemnite rostra during the last 60–70 years. The correct interpretation of these fossils was made possible by the fact that one of these specimens retained the remnants of the conotheca within the alveolus, while others preserved the conical, tapering ...
András Galácz
wiley   +1 more source

Atlas of Northwestern Mediterranean Coccolithophores

Scientia Marina, 2002
The present Atlas contains a detailed study, based in scanning electron microscopy (SEM) observations, of living coccolithophores from NW Mediterranean waters. The study contains 103 figures with 411 micrographs, which correspond to 168 coccolithophores (
Lluïsa Cros, José Manuel Fortuño
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

Were Oceanic Plateaus Instrumental for Calcareous Nannoplankton Evolution?

, 2011
The history of calcareous nannoplankton shows a general increase in species richness through the Mesozoic. Fertility and chemistry of the oceans, climate and pCO2 seem instrumental for nannoplankton abundance, diversification and adaptation, but high ...
E. Erba, C.E. Casellato, C. Bottini
core   +2 more sources

Revised History of Pleistocene Vertical Motions in NE Sicily and Southern Calabria, Italy, From 40Ar/39Ar Dating and Fault Zone Morphology

Tectonics, Volume 45, Issue 2, February 2026.
Abstract Long‐term rates of crustal uplift in southern Calabria and NE Sicily are incompletely understood due to limited information about the age of marine terraces at 1.0–1.3 km above sea level (asl). This study provides a new constraint on high‐elevation terrace ages through integrated analysis of geochronology, stratigraphy, shoreline modeling, and
Rebecca J. Dorsey, Gianfranco Di Vincenzo, Marco Meschis, Sergio G. Longhitano, William Cavazza, Domenico Chiarella   +5 more
wiley   +1 more source

Biostratigraphic framework of the Konkian-Sarmatian boundary based on microfossils from the well #20 Kerch Peninsula (Crimea)

Mineralia Slovaca
The Konkian-Sarmatian transition represents a major interval of biotic turnover and paleoenvironmental change in the Eastern Paratethys. This study investigates the upper Konkian and Lower Sarmatian deposits penetrated by well #20 on the western Kerch ...
Yuliia Vernyhorova, Michal Jamrich, Radovan Kyška-Pipík, Natália Hudáčková   +3 more
doaj   +1 more source

LE NANNOPLANCTON CALCAIRE ET LA FORMATION DES ALTERNANCES CALCAIRES-MARNES DANS LE LIAS DES BASSINS DE MARCHES-OMBRIE (ITALIE)

Rivista Italiana di Paleontologia e Stratigrafia, 2017
In the classical sections of Sentino-Valdorbia, Bosso and the Marne di Monte Serrone type-section the rhythmic, limestone/marl sedimentation of the following formations were studied: the Corniola (Late Sinemurian to Earliest Toarcian) and the Marne di ...
DENISE NOËL, GEORGES BUSSON, ANNIE CORNÉE, ANNE-MARIE MANGIN   +3 more
doaj   +1 more source