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显生宙中已识别出至少有42次全球性的生物灭绝事件,它们能够作为全球性的地表化学和生物量变化的标志。作为局部范围的对比工具,这些事件的标定需要详细的古生物学研究,这种标定又因保存条件的差异而具有不确定性。与这些事件相关的是,海水的化学成分变化可以反映在石灰岩和碳酸盐岩化石中 C、O 和 Sr 同位素组成的系统变化上,海水成分的这些变化能够显示出一些生物灭绝事件与可对比的同位素的显著变化存在一致性。事件地层学的目的就是利用这些生物灭绝事件在古生
At least 42 global biological extinctions have been identified in the Phanerozoic and can serve as a hallmark of global changes in surface chemistry and biomass. As a comparison of local ranges, calibration of these events requires detailed palaeontological studies that are subject to uncertainty due to differences in storage conditions. Associated with these events, the chemical composition of the seawater changes can be reflected in systematic changes in the C, O and Sr isotopic composition of limestone and carbonate fossils, and these changes in seawater composition can show some biological extinction events in contrast to Significant changes in the isotope of consistency. The purpose of event stratigraphy is to harness the extinction of these creatures in the Paleozoic