Results 21 to 30 of about 276 (173)
The supercontinent cycle and Earth's long‐term climate
Annals of the New York Academy of Sciences, Volume 1515, Issue 1, Page 33-49, September 2022., 2022 The supercontinent cycle, by which Earth history is viewed as having been punctuated by the episodic assembly and breakup of supercontinents, has, through its management of plate motion, planetary geography, sea level and mantle circulation, profoundly influenced Earth's long‐term climatic history.
R. Damian Nance
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The Depositional Record, Volume 8, Issue 2, Page 502-523, June 2022., 2022 In a study of the Middle–Late Cambrian Port au Port Group, Newfoundland, marine cements precipitated on the lead up to and around the Steptoean Positive Carbon Isotope Excursion (SPICE) have been shown to contain increasing levels of strontium (up to 5500 ppm).
Joyce E. Neilson +4 more
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A nutrient control on expanded anoxia and global cooling during the Late Ordovician mass extinction
Communications Earth & Environment, 2022 Phosphorus recycling played a critical role in driving the Late Ordovician mass extinction through ocean euxinia, and in the initiation of the Hirnantian glaciation, according to geochemical analyses of marine rocks from China and global biogeochemical ...
Zhen Qiu +8 more
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Sedimentology, Volume 69, Issue 1, Page 162-198, January 2022., 2022 ABSTRACT Bryozoan–stromatolite associations (bryostromatolites) formed conspicuous reef structures throughout the Sheinwoodian (Wenlock) to Ludfordian (Ludlow) stratigraphy on Gotland but have not been described so far. They are mainly composed of encrusting bryozoans forming a complex intergrowth with porostromate and spongiostromate microbes and are ...
Anna Lene Claussen +3 more
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Late Ordovician jawed polychaete fauna from the Spiti Valley, northern India [PDF]
Estonian Journal of Earth Sciences, 2023 The final part of the Ordovician Period was characterised by major perturbations in climate, environments and ecosystems, as proved by numerous studies. These changes resulted in one of the biggest extinctions in Earthâs history. Most research in early
Petra Tonarová +3 more
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More about the Ordovician–Silurian transition beds at Mirny Creek, Omulev Mountains, NE Russia: carbon isotopes and conodonts [PDF]
Estonian Journal of Earth Sciences, 2012 Profound environmental and biodiversity changes take place in the Ordovician–Silurian boundary interval. The Mirny Creek and Neznakomka River bank sections discussed in this paper expose the upper Katian–lower Rhuddanian part of the boundary beds.
Dimitri Kaljo +3 more
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Ordovician Bryozoa of Estonia [PDF]
Estonian Journal of Earth Sciences, 2023 sessile colonial, filter-feeding animals, many of which possess hard carbonate skeletons of different morphology. The bryozoan faunas of the Ordovician of Estonia were studied early by famous naturalists such as Karl Eduard von Eichwald and WÅadisÅaw ...
Andrej Ernst
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An earth system approach to understanding the end-Ordovician (Hirnantian) mass extinction [PDF]
, 2014 The Hirnantian mass extinction is recognized as the first of the "big three" extinctions and, along with the end-Permian and end-Cretaceous events, is the result of an acceleration in biotic extinctions concomitant with a rise in originations. The Hirnantian mass extinction is characterized by high taxonomic impact and within-community extinctions ...
Armstrong, H. A., Harper, D.A.T.
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Литосфера, 2018 The results of lithological and geochemical study of the Hirnantian deposits on the western slope of the Subpolar (Ko-BKB and Ko-108/01 sections) and Northern (BK-2 section) Urals are presented.
Anna I. Antoshkina +1 more
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EVENT STRATIGRAPHY AND CORRELATION PROBLEMS OF THE ORDOVICIAN STRATA OF GORNY ALTAI AND SALAIR
Геодинамика и тектонофизика, 2021 Study of the Ordovician sedimentary sequences of Gorny Altai and Salair has revealed lithological and paleontological features correlating with global sedimentary events:(1) The Acerocare Regressive Event (an initial event in the Early Tremadocian);(2 ...
N. V. Sennikov +5 more
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