Results 131 to 140 of about 2,095 (187)

The first Silurian horseshoe crab reveals details of the xiphosuran ground plan. [PDF]

Proc Biol Sci
Lamsdell JC.
europepmc   +1 more source

Episodic body size variations of early Paleozoic trilobites associated with marine redox changes. [PDF]

Sci Adv
Sun Z, Zhao F, Zeng H, Erwin DH, Zhu M.
europepmc   +1 more source

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’
Taniel Danelian, Thomas Servais, Christian Klug   +2 more
exaly   +4 more sources

Abrupt global-ocean anoxia during the Late Ordovician–early Silurian detected using uranium isotopes of marine carbonates [PDF]

Proceedings of the National Academy of Sciences of the United States of America, 2018
James Wheeley, VÍCTOR Polyak, Yemane Asmerom   +2 more
exaly   +2 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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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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