Multiple microtektite horizons in upper Eocene marine sediments - No evidence for mass extinctions

Details Multiple microtektite horizons in upper Eocene marine sediments - No evidence for mass extinctions Multiple microtektite horizons in upper Eocene marine sediments - No evidence for mass extinctions

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...221..150k&link_type=abstract

Science (ISSN 0036-8075), vol. 221, July 8, 1983, p. 150-152. NSF-supported research.

Biology

36

Marine Biology, Paleobiology, Plankton, Sediments, Climatology, Extinction, Marine Environments, Stratigraphy, Tektites, Microtektites, Sediments, Extinction, Ages, Fission Tracks, Life, Impacts

Scientific paper

The biostratigraphic record in 18 middle-Eocene to middle-Oligocene deep-sea-sediment sequences is investigated, using quantitative population studies of planktic foraminifers and nannofossils to date horizons of microtektites believed to be residues from the impacts of large bolides. Results are corroborated by those of magnetic and fission-track dating techniques. Five of the microtektite occurrences are coeval at 37.5-38.0 million years old (mvo); three are coeval at 38.5-39.5 mvo; three are 31-32 myo; and three probable microtektite occurrences are 36-36.5 myo. The 37.5-38.0-myo horizons can be correlated to the North American tektite-strewn field. No evidence of mass faunal extinctions is found associated with the microtektite horizons. Changes in fauna are characterized as gradual, suggesting that they were caused by climatic cooling associated with the growth of the Antarctic ice sheet. This cooling has also been considered a partial explanation for the widespread hiatuses observed in Eocene/Oligocene deep-sea sediments.

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