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- W2047271565 abstract "There is much evidence that the Cretaceous-Tertiary boundary was marked by a massive meteorite impact. Theoretical consideration of the consequences of such an impact predicts sharp extinctions in many groups of animals precisely at the boundary. Paleontological data clearly show gradual declines in diversity over the last 1 to 10 million years in various invertebrate groups. Reexamination of data from careful studies of the best sections shows that, in addition to undergoing the decline, four groups (ammonites, cheilostomate bryozoans, brachiopods, and bivalves) were affected by sudden truncations precisely at the iridium anomaly that marks the boundary. The paleontological record thus bears witness to terminal-Cretaceous extinctions on two time scales: a slow decline unrelated to the impact and a sharp truncation synchronous with and probably caused by the impact." @default.
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- W2047271565 date "1984-03-16" @default.
- W2047271565 modified "2023-10-16" @default.
- W2047271565 title "Impact Theory of Mass Extinctions and the Invertebrate Fossil Record" @default.
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- W2047271565 doi "https://doi.org/10.1126/science.223.4641.1135" @default.
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