Results 171 to 180 of about 6,971 (210)

Two pulses of extinction of larger benthic foraminifera during the Pliensbachian-Toarcian and early Toarcian environmental crises

Palaeogeography, Palaeoclimatology, Palaeoecology, 2020
Abstract The early Toarcian (Early Jurassic, ~183 Ma) was characterized by a pronounced oceanic anoxic event (OAE), global warming, major changes in hydrological cycling and a second order mass extinction. Most studies of early Toarcian geobiology have focused on the Northern Hemisphere, and only a few studies have been carried out on strata from the
Shouyi Jiang, Haijun Song, David B. Kemp, Xu Dai, Xiaokang Liu   +4 more
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Global radiolarian zonation for the Pliensbachian, Toarcian and Aalenian

Palaeogeography, Palaeoclimatology, Palaeoecology, 2010
Abstract Jurassic radiolarians from 220 samples in Queen Charlotte Islands, B.C., Williston Lake, B.C., east-central Oregon, Baja California Sur, southern Spain, Austria, Slovenia, Turkey, Oman, Japan and Argentina were studied in order to construct global zonation for the Pliensbachian, Toarcian and Aalenian stages.
Carter Elizabeth S., Gorican Špela, Guex Jean, O'Dogherty Luis, De Wever Patrick, Dumitrica Paulian, Hori Rie S., Matsuoka Atsushi, Whalen Patricia A.   +8 more
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Shallow- and deep-ocean Fe cycling and redox evolution across the Pliensbachian–Toarcian boundary and Toarcian Oceanic Anoxic Event in Panthalassa

Earth and Planetary Science Letters, 2023
Wenhan Chen, David B Kemp, Tianchen He
exaly   +2 more sources

Lower Toarcian palynostratigraphy of Pozzale, central Italy

Palynology, 1997
Abstract Palynological studies of the Lower Toarcian Pozzale section of central Italy (Tethyan Realm, Mediterranean province) have revealed significant differences between palynomorph assemblages from the Boreal and Tethyan realms and marked similarities between the two bioprovinces of the Tethyan Realm (Mediterranean and Sub‐Mediterranean).
Raffaella Bucefalo Palliani, James B. Riding   +1 more
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Carbon-cycle changes during the Toarcian (Early Jurassic) and implications for regional versus global drivers of the Toarcian oceanic anoxic event

Earth-Science Reviews, 2020
Abstract The Early Jurassic Toarcian oceanic anoxic event (T-OAE) is characterized by an extinction event, a major sea-level rise, enhanced marine primary productivity, elevated seawater temperatures, widespread deposition of organic-rich sediments, and a negative carbon-isotope excursion (CIE).
Remirez, Mariano Nicolas, Algeo, Thomas
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Jurassic (Toarcian to Kimmeridgian) dinoflagellate cysts and paleoclimates

Palynology, 1999
Abstract Multivariate statistics have been used to identify the paleoclimatic‐paleoecological affinities of most European Jurassic (Toarcian to Kimmeridgian) dinoflagellate cyst taxa. These analyses were then used to construct dinoflagellate cyst diagrams (abbreviated to ‘cyst diagrams'), which are analogous to pollen diagrams.
James B. Riding, Richard N. L. B. Hubbard   +1 more
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Towards an Ammonite zonation for the Toarcian of North America

Geobios, 1994
Abstract Toarcian deposits in North America occur on the craton from southwestern Alberta to northern Alaska and the Canadian Arctic, and on the accreted terranes of the Cordillera from east-central Oregon to southern Alaska. The complicated tectonic history of the Cordillera and the incomplete nature of much of the ammonite fauna have precluded a ...
Giselle K. Jakobs, Paul L. Smith, Howard W. Tipper   +2 more
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The Liassic ichthyosaurStenopterygius cf.quadriscissus from the lower Toarcian of Dobbertin (northeastern Germany) and some considerations on lower Toarcian marine reptile palaeobiogeography

Paläontologische Zeitschrift, 2004
An incomplete skull of the lower Toarcian ichthyosaurStenopterygius cf.quadriscissus is described from the lower Toarcian of Dobbertin (Mecklenburg, northeastern Germany). It represents both the northeasternmost occurrence of this ichthyosaur genus and the first diagnostic specimen from East Germany.
Michael W. Maisch, Jörg Ansorge
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The Toarcian Sulfur Cycle: Recent Progress

Goldschmidt2022 abstracts, 2022
Robert Newton, Tianchen He, Zhong Han, Wenhan Chen, Xiumian Hu, David Kemp, Benjamin Mills   +6 more
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New belemnites from Toarcian and Aalenian of Siberia

International Geology Review, 1966
From the Jurassic (Toarcian and Aalenian) of the Lena river basin the following Belemnites are described as new: Sachsibeius mirus, Lenobelus lenensis, Lenobelus gravis, Lenobelus reconditus, Dactyloteuthis yacutiensis. Sachsibelus (type species S. mirus) and Lenobelus (type species L. lenensis) are new genera.
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