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Dresbachian extinction event: 502 Ma: End-Botomian extinction event: 517 Ma: Precambrian: End-Ediacaran extinction: 542 Ma: Anoxic event [45] Great Oxygenation Event: 2400 Ma: Rising oxygen levels in the atmosphere due to the development of photosynthesis as well as possible Snowball Earth event. (see: Huronian glaciation.)
An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth.Such an event is identified by a sharp fall in the diversity and abundance of multicellular organisms.
Deeper in time, a mass extinction event that ended the Devonian Period, a geological era when life thrived on land for the first time, was also attributed to a hyperthermal event likely triggered ...
Wikipedia categories named after mass extinctions (3 C) D. Documentary films about extinctions (5 P) P. Phanerozoic extinctions (5 C) T. Mass extinction timelines (3 ...
Anoxia is the most common culprit for the second pulse of the Late Ordovician mass extinction and is connected to many other mass extinctions throughout geological time. [ 17 ] [ 52 ] It may have also had a role in the first pulse of the Late Ordovician mass extinction, [ 70 ] though support for this hypothesis is inconclusive and contradicts ...
c. 1,700 Ma – Stabilization of second major continental mass, the Guiana Shield in South America; Concentrated uranium deposits in Oklo, Gabon, in West Africa are activated after being inundated with ground water in what amounts to a natural nuclear reaction – Reactions continue off and on probably never exceeding 100 kilowatts of thermal ...
Artist's rendering of the Chicxulub asteroid entering Earth's atmosphere 66 million years ago, triggering events that caused a mass extermination. Roger Harris/Science Photo library via Getty ...
2021 research found that the "Big Five" mass extinctions were associated with a warming of around 5.2 °C (9.4 °F). The paper estimated that this level of warming over the preindustrial occurring today would also result in a mass extinction event of the same magnitude (~75% of marine animals wiped out). [51]