Results 171 to 180 of about 7,297 (224)

An endemic community of Polish Late Ordovician gastropods

Bulletin of Geosciences
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The onset of the ‘Ordovician Plankton Revolution’ in the late Cambrian

Palaeogeography, Palaeoclimatology, Palaeoecology, 2016
Abstract The ‘Great Ordovician Biodiversification Event’ comprises the rapid diversification of marine organisms during the Ordovician Period. It is now clear that this adaptive radiation started for some organisms already in the Cambrian and continued for others beyond the end of the Ordovician, making the ‘Great Ordovician Biodiversification Event’
Thomas Servais, Vincent Perrier, Taniel Danelian   +2 more
exaly   +4 more sources

Late Ordovician extinctions of bryozoans

Lethaia, 1992
An analysis of the final stratigraphic appearances of byrozoan species and genera, compiled in a world-wide bryozoan data base, revealed three discrete Late Ordovician extinctions. A Late Carddoc (Onnian) extinction was most pronounced on the plates of Baltica and Siberia.
Michael E. Tuckey, Robert L. Anstey
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New insights into the Late Ordovician magmatism in the Eastern Pyrenees: U–Pb SHRIMP zircon data from the Canigó massif

Gondwana Research, 2010
New geochronological data from the Canigó massif (Eastern Pyrenees) using U–Pb SIMS on zircon provide evidence of the existence of a Late Ordovician (456–446 Ma) plutonic event that emplaced granitic and dioritic bodies into a Late Neoproterozoic–Early ...
Pedro Castiñeiras, Montserrat Liesa
exaly   +3 more sources

Late Middle Ordovician environmental change and extinction: Harbinger of the Late Ordovician or continuation of Cambrian patterns?

Geology, 1997
Positive excursions in carbon isotope compositions of carbonate (∼ 3‰) and organic carbon (∼ 4‰–6‰) from the late Middle Ordovician (middle Caradocian) of the midcontinent and the eastern United States indicate widespread increases in productivity and rates of organic carbon burial that may have drawn down atmospheric p CO 2 , precipitating global ...
Patzkowsky, ME, Slupik, LA, Arthur, MA, Pancost, RD, Freeman, KH   +4 more
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Microbialite resurgence after the Late Ordovician extinction

Nature, 2004
Microbialites, including biogenic stromatolites, thrombolites and dendrolites, were formed by various microbial mats that trapped and bound sediments or formed the locus of mineral precipitation. Microbialites were common and diverse during the Proterozoic, but declined in abundance and morphological diversity when multicellular life diversified during
Peter M, Sheehan, Mark T, Harris
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Late Ordovician Tunnel Valleys

71st EAGE Conference and Exhibition - Workshops and Fieldtrips, 2009
Overdeepened incisions forming tunnel valleys are remarkable geomorphic elements, which provide valuable information on past subglacial hydrological regimes and may constitute attractive reservoir targets. Geometries and distribution of Quaternary tunnel valleys have been intensively illustrated based on geophysics, while the glacial record of pre ...
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Late Ordovician tunnel valleys in southern Jordan

Geological Society, London, Special Publications, 2012
Abstract The Upper Ordovician glacial record of southern Jordan (Ammar Fm.) essentially consists of palaeovalley infills and of a subordinate time-transgressive fluvial to shallow-marine succession overstepping both the palaeovalleys and interfluvial areas.
Douillet, G., Ghienne, Jean-François, Géraud, Yves, Abueladas, A., Diraison, Marc, Al-Zoubi, A.   +5 more
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The Late Ordovician Mass Extinction

Annual Review of Earth and Planetary Sciences, 2001
▪ Abstract  Near the end of the Late Ordovician, in the first of five mass extinctions in the Phanerozoic, about 85% of marine species died. The cause was a brief glacial interval that produced two pulses of extinction. The first pulse was at the beginning of the glaciation, when sea-level decline drained epicontinental seaways, produced a harsh ...
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Late Ordovician glaciation in southern Turkey

Terra Nova, 2003
ABSTRACT We present a new survey of several Palaeozoic sections in both the Taurus range and the Border Folds that documents typical glacial features including a glacial pavement and striated dropstones (Halevikdere Formation) and demonstrates the former presence of an ice sheet in southern and south‐eastern Turkey.
Monod, Olivier, Kozlu, H., Ghienne, J.-F., T. Dean, W., Günay, Y., Le Hérissé, Alain, Paris, Florentin, Robardet, M.   +7 more
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