| Mass Extinction——A Fundamental Indicator for Major Natural Divisions of Geological History |
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| 摘 要： | In the Phanerozoic, there are three major geological boundaries: Precambrian/Cambrian.Permian/Triassic and Cretaceous/Tertiary. Studies of these boundaries in China and over the world stronglysuggest that they have the following similar features: mass extinctions of many taxa, positive anomalies ofplatinum-group metals, and abrupt changes of stable isotopes (δ~(13)C). It is quite probable that these were theconsequences of some rare catastrophic events of extraterrestrial origin. Hence, the three above-mentionedmass extinction events may be regarded as key indicators for the division of the geological history of thePhanerozoic.
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Mass Extinction——A Fundamental Indicator for Major Natural Divisions of Geological History |
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| Authors: | Xu Daoyi Zhang Qinwen Sun Yiyin |
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| Abstract: | Abstract In the Phanerozoic, there are three major geological boundaries: Precambrian / Cambrian, Permian / Triassic and Cretaceous / Tertiary. Studies of these boundaries in China and over the world strongly suggest that they have the following similar features: mass extinctions of many, taxa, positive anomalies of platinum-group metals, and abrupt changes of stable isotopes (δ13C). It is quite probable that these were the consequences of some rare catastrophic events of extraterrestrial origin. Hence, the three above-mentioned mass extinction events may be regarded as key indicators for the division of the geological history of the Phanerozoic. |
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