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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 ...
Estimates of the number of major mass extinctions in the last 540 million years range from as few as five to more than twenty. These differences stem from disagreement as to what constitutes a "major" extinction event, and the data chosen to measure past diversity.
The looming sixth mass extinction. A growing number of scientists believe a sixth mass extinction event of a magnitude equal to the prior five has been unfolding for the past 10,000 years as ...
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 ...
Background extinction rates are typically measured in order to give a specific classification to a species and this is obtained over a certain period of time. There are three different ways to calculate background extinction rate. [5] The first is simply the number of species that normally go extinct over a given period of time.
Plants are relatively immune to mass extinction, with the impact of all the major mass extinctions "insignificant" at a family level. [44] [dubious – discuss] Floral diversity losses were more superficial than those of marine animals. [150] Even the reduction observed in species diversity (of 50%) may be mostly due to taphonomic processes.
Scientists, conservationists and government representatives will gather this week in Montreal to decide on a plan to stop a stunning loss of plant and animal life around the globe. The United ...
It has been shown that the prevailing climate at the time of extinction (40,000–50,000 BP) was similar to that of today, and that the extinct animals were strongly adapted to an arid climate. The evidence indicates that all of the extinctions took place in the same short time period, which was the time when humans entered the landscape.