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  2. Extinction symbol - Wikipedia

    en.wikipedia.org/wiki/Extinction_symbol

    The extinction symbol with an X-shaped pictogram of an hourglass.The letter X stands for the first syllable of the word "extinction" Flag with the extinction symbol. The extinction symbol represents the threat of holocene extinction on Earth; a circle represents the planet and a stylised hourglass is a warning that time is running out for many species.

  3. List of extinction events - Wikipedia

    en.wikipedia.org/wiki/List_of_extinction_events

    Permian–Triassic extinction event 252 Ma Large igneous province (LIP) eruptions [ 23 ] from the Siberian Traps , [ 24 ] an impact event (the Wilkes Land Crater ), [ 25 ] an Anoxic event , [ 26 ] an Ice age , [ 27 ] or other possible causes

  4. 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 .

  5. Triassic–Jurassic extinction event - Wikipedia

    en.wikipedia.org/wiki/Triassic–Jurassic...

    The Triassic–Jurassic (Tr-J) extinction event (TJME), often called the end-Triassic extinction, marks the boundary between the Triassic and Jurassic periods, . It represents one of six major extinction events during the Phanerozoic , profoundly affecting life on land and in the oceans.

  6. Late Pleistocene extinctions - Wikipedia

    en.wikipedia.org/wiki/Late_Pleistocene_extinctions

    Overkill proponents, however, say this is due to the fast extinction process in North America and the low probability of animals with signs of butchery to be preserved. [159] The majority of North American taxa have too sparse a fossil record to accurately assess the frequency of human hunting of them. [10]

  7. Timeline of extinctions in the Holocene - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_extinctions_in...

    The following list is incomplete by necessity, since the majority of extinctions are thought to be undocumented, and for many others there isn't a definitive, widely accepted last, or most recent record. According to the species-area theory, the present rate of extinction may be up to 140,000 species per year. [1]

  8. Extinction - Wikipedia

    en.wikipedia.org/wiki/Extinction

    Extinction is the termination of a taxon by the death of its last member. A taxon may become functionally extinct before the death of its last member if it loses the capacity to reproduce and recover. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively.

  9. Cretaceous–Paleogene extinction event - Wikipedia

    en.wikipedia.org/wiki/Cretaceous–Paleogene...

    The Cretaceous–Paleogene (K–Pg) extinction event, [a] also known as the K–T extinction, [b] was the mass extinction of three-quarters of the plant and animal species on Earth [2] [3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.