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- W2321859409 abstract "The Eocene-Oligocene boundary is widely cited as the other example (besides the Cretaceous-Tertiary boundary) of a known relationship between mass extinctions and bolide impacts. The stratigraphic ranges of species of Gulf Coast molluscs reveal a stepwise extinction pattern from the late Middle Eocene to the Oligocene with a peak of extinctions at the Middle-Late Eocene boundary. Although several large transgressions and regressions of the Gulf Coast occurred during this interval, there is little or no correlation between the molluscan extinctions and shelf-area reduction. Temperature drops appear to be the primary cause of these extinctions because of their close stratigraphic association with the extinction events and because of the selective loss of warm-water taxa. These conclusions corroborate the relationship between temperature and extinction seen by Stanley (1984). Although the stepped nature of the extinctions argues against the single impact hypothesis as a cause, it is intriguing that these extinctions correlate with sediments containing multiple microtektite horizons and stepped extinctions of planktonic foraminifera. These observations are consistent with a multiple impact or comet shower scenario as the ultimate cause of the temperature drops." @default.
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- W2321859409 date "1987-01-01" @default.
- W2321859409 modified "2023-09-25" @default.
- W2321859409 title "Extinction of Late Eocene to Oligocene Molluscs: Relationship to Shelf Area, Temperature Changes, and Impact Events" @default.
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- W2321859409 doi "https://doi.org/10.2307/3514573" @default.
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