Results 161 to 170 of about 2,661 (202)

The Valanginian isotope event: A complex suite of palaeoenvironmental perturbations

Palaeogeography, Palaeoclimatology, Palaeoecology, 2011
Abstract The Valanginian records a severe crisis of carbonate systems, both on platforms and in the pelagic realm. This crisis is roughly concomitant with the Weissert Event, characterized by a positive δ13C excursion of about 2‰ in marine carbonates. However, it is unclear if the response of these two carbonate systems to the global perturbations is
Gréselle, Benjamin, Pittet, Bernard, Mattioli, Emanuela, Joachimski, Michael M., Barbarin, Nicolas, Riquier, Laurent, Reboulet, Stéphane, Pucéat, Emmanuelle   +7 more
openaire   +2 more sources

Community Replacement of Neritic Carbonate Organisms During the Late Valanginian Platform Demise: A New Record From the Provence Platform

Palaeogeography, Palaeoclimatology, Palaeoecology, 2012
24 pagesInternational audienceThe Valanginian is marked by amajor platform demise inducing a hiatus in the northern Tethyan neritic carbonate record from the top of the lower Valanginian to the lower Hauterivian.
Bernard Pittet, Emanuela Mattioli, Michel Guiraud   +2 more
exaly   +2 more sources

Orbital Chronostratigraphy of the Valanginian-Hauterivian Boundary

2004
Abstract On the basis of cyclostratigraphy and sequence stratigraphy criteria, an orbital chronostratigraphy is hereproposed for the Upper Valanginian-Lower Hauterivian (Lower Cretaceous) stratigraphic interval. For such a purpose two biostratigraphically constrainedcarbonate platform section were measured and sampled at centimeter ...
Ferreri, V, Amodio, S, Sandulli, R, D'Argenio, B   +3 more
openaire   +4 more sources

Paleoceanographic Changes During the Early Cretaceous (Valanginian–Hauterivian): Evidence From Oxygen and Carbon Stable Isotopes

Earth and Planetary Science Letters, 2000
We investigated Valanginian-Hauterivian bulk rock and belemnite samples from Vocontian Basin sections in southeastern France for their stable carbon and oxygen isotope signature.
Luc Bulot, Bas van de Schootbrugge, Karl B. Föllmi   +2 more
exaly   +2 more sources

First Valanginian Polacanthus Foxii (Dinosauria, Ankylosauria) From England, From the Lower Cretaceous of Bexhill, Sussex [PDF]

Proceedings of the Geologists Association, 2014
A new partial skeleton of the armoured ornithischian dinosaur Polacanthus found in the Wadhurst Clay Formation (Valanginian stage) of Bexhill, Sussex is the oldest recorded occurrence of this taxon.
Honeysett, K., Blows, W.
exaly   +2 more sources

Magnetostratigraphy and Biostratigraphy of the Valanginian in the Crimean Mountains

2019
Preliminary results of the study aiming to construct a magnetostratigraphic scheme of the Valanginian of the Crimean Mountains are presented. Paleomagnetic and petromagnetic data were obtained on oriented samples taken from 363 stratigraphic levels of 10 sections in East and Southwest Crimea.
V. A. Grishchenko, A. G. Manikin, Yu. N. Savelieva, A. A. Feodorova   +3 more
openaire   +1 more source

The mid-Valanginian Weissert Event as recorded by calcareous nannoplankton in the Vocontian Basin

Palaeogeography, Palaeoclimatology, Palaeoecology, 2014
The mid-Valanginian Weissert Event represents one of the most significant paleoceanographic events of the Early Cretaceous and is characterized by a major perturbation of the carbon cycle testified by a positive carbon isotope shift, a crisis of both neritic and pelagic carbonate producers, and climatic fluctuations.
Mattioli, Emanuela, Pittet, Bernard, Riquier, Laurent, Grossi, Vincent   +3 more
openaire   +3 more sources

Biostratigraphy of the Valanginian in Sverdrup Basin, District of Franklin

1977
A sequence of Valanginian rocks was studied in the part of the depocentre of the Sverdrup Basin, now occupied by Amund Ringnes and Ellef Ringnes islands. The about 500 m thick Valanginian sequence is represented mostly by the upper part of the Deer Bay Formation.
openaire   +1 more source

New occurrence of foraminifers of genus Siphoninella in the Crimean Valanginian

International Geology Review, 1967
Siphoninella antiqua n. sp., from the lower Valanginian of the Crimea, is the first representative of this genus reported from below the middle Eocene, and the first representative of the Family Siphoninidae from below the Upper Cretaceous. It is assigned to Siphoninella on the basis of the presence of an evolute portion of the test in larger specimens
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The Ryazanian–Valanginian correlation problem in northeastern West Siberia

Regional Geology and Metallogeny
The paper comprehensively discusses the Lower Cretaceous in the junction zone of different structure-facies areas in northeastern West Siberia: Turukhansk, Tazovsky, and Malaya Kheta structure-facies sub-areas of the Ust-Yenisei region. The authors analyze three-dimensional seismic survey data, well logs, as well as sedimentological and ...
I. V. Kislukhin, G. L. Rozbaeva
openaire   +1 more source