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ShareAn extinction event (also extinction-level event, ELE) occurs when a large number of species die out in a relatively short period of time.
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Since life began on Earth, a number of major mass extinctions have greatly exceeded the background extinction rate present at other times.
Though there were undoubtedly mass extinctions in the Archean and Proterozoic, it is only during the Phanerozoic Eon that the biological invention of bones and shells has provided a sufficient fossil record from which to make a systematic study of extinction patterns.
For more information about the topic Extinction event, read the full article at Wikipedia.org, or see the following related articles:
Cretaceous-Tertiary extinction event — The Cretaceous-Tertiary extinction event was a period of massive extinction of species, about 65.5 million years ago. It corresponds to the end of ... > read more
Permian-Triassic extinction event — The Permian-Triassic (P-T or PT) extinction event, sometimes informally called the Great Dying, was an extinction event that occurred approximately ... > read more
Cambrian — The Cambrian is a major division of the geologic timescale that begins about 542 Ma (million years ago) at the end of the Proterozoic eon and ended ... > read more
Impact event — Impact events are caused by the collision of large meteoroids, asteroids or comets (generically: bolides) with Earth and may sometimes be followed by ... > read more
Smilodon — Smilodon means knife tooth, an entirely appropriate name given its enormous fangs. The smilodon species are also known as Saber-Toothed Cats (which ... > read more
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