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Roadblocks on the kill curve: Testing the Raup hypothesis

Palaios

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Abstract

The documented presence of two large (???100-km diameter), possibly coeval impact craters of late Eocene age, requires modification of the impact-kill curve proposed by David M. Raup. Though the estimated meteorite size for each crater alone is large enough to have produced considerable global environmental stress, no horizons of mass mortality or pulsed extinction are known to be associated with either crater or their ejecta deposits. Thus, either there is no fixed relationship between extinction magnitude and crater diameter, or a meteorite that would produce a crater of >100-km diameter is required to raise extinction rates significantly above a ???5% background level. Both impacts took place ???1-2 m.y. before the "Terminal Eocene Event"( =early Oligocene pulsed extinction). Their collective long-term environmental effects, however, may have either delayed that extinction pulse or produced threshold conditions necessary for it to take place.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Roadblocks on the kill curve: Testing the Raup hypothesis
Series title:
Palaios
Volume
12
Issue:
6
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Palaios
First page:
582
Last page:
590
Number of Pages:
9