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2. List of extinction events - Wikipedia

   en.wikipedia.org/wiki/List_of_extinction_events

   Late Ordovician mass extinction: 445-444 Ma Global cooling and sea level drop, and/or global warming related to volcanism and anoxia [43] Cambrian: Cambrian–Ordovician extinction event: 488 Ma: Kalkarindji Large Igneous Province? [44] Dresbachian extinction event: 502 Ma: End-Botomian extinction event: 517 Ma: Precambrian: End-Ediacaran ...

3. Extinction event - Wikipedia

   en.wikipedia.org/wiki/Extinction_event

   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 .

4. Late Ordovician mass extinction - Wikipedia

   en.wikipedia.org/.../Late_Ordovician_mass_extinction

   The Late Ordovician mass extinction (LOME), sometimes known as the end-Ordovician mass extinction or the Ordovician-Silurian extinction, is the first of the "big five" major mass extinction events in Earth's history, occurring roughly 445 million years ago (Ma). [1]

5. Late Ordovician - Wikipedia

   en.wikipedia.org/wiki/Late_Ordovician

   The Late Ordovician is the third and final epoch of the Ordovician period, lasting 15.1 million years and spanning from around 458.2 to 443.1 million years ago. [4] [5] The rocks associated with this epoch are referred to as the Upper Ordovician Series.

6. What is a mass extinction, and why do scientists think we’re ...

   www.aol.com/news/brief-history-end-world-every...

   The most famous of these mass extinction events — when an asteroid slammed into Earth 66 million years ago, dooming the dinosaurs and many other species — is also the most recent. But ...

7. The most famous extinction event in the planet's history is ...

   www.aol.com/news/biggest-extinction-event...

   Scientists are using a UC Santa Cruz greenhouse to recreate the mass extinction that wiped out the dinosaurs. They want to learn why some species survived when so many did not.

8. Holocene extinction - Wikipedia

   en.wikipedia.org/wiki/Holocene_extinction

   Mass extinctions are characterized by the loss of at least 75% of species within a geologically short period of time (i.e., less than 2 million years). [18] [51] The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinction event, after the Ordovician–Silurian extinction events, the Late Devonian extinction, the Permian–Triassic extinction ...

9. How did cockroaches survive the asteroid that led to the ...

   www.aol.com/news/did-cockroaches-survive...

   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 ...