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Timeline_of_Earth-1_prehistory_to_18th_century [2020/05/23 19:45] – [150 million years ago:] docquantum | Timeline_of_Earth-1_prehistory_to_18th_century [2020/05/23 19:47] – [65 million years ago:] docquantum | ||
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=====Cenozoic Era===== | =====Cenozoic Era===== | ||
====65 million years ago:==== | ====65 million years ago:==== | ||
- | * Cretaceous–Paleogene extinction event: A meteor impact in the Yucatan, Mexico, causes a mass extinction and ending | + | * Cretaceous–Paleogene extinction event: A meteor impact in the Yucatan, Mexico, causes a mass extinction and ends the Mesozoic Era. About 17% of all families, 50% of all genera, and 75% of all species become extinct. In the seas it reduces the percentage of sessile animals to about 33%. The majority of non-avian dinosaurs become extinct during that time. The boundary event is severe, with a significant amount of variability in the rate of extinction between and among different clades. Mammals and birds emerge as dominant land vertebrates in the age of new life. Most of the dinosaurs are killed off, with only a remnant of dinosaurs |
====45 million years ago:==== | ====45 million years ago:==== | ||
* Australia separates from Antarctica. Modern mammals appear on Earth. | * Australia separates from Antarctica. Modern mammals appear on Earth. |