Comet showers as a cause of mass extinction

Details Comet showers as a cause of mass extinction Comet showers as a cause of mass extinction

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.329..118h&link_type=abstract

Nature (ISSN 0028-0836), vol. 329, Sept. 10, 1987, p. 118-126. Research supported by the Alfred P. Sloan Foundation, NASA, and N

Astronomy and Astrophysics

Astronomy

102

Comets, Extinction, Impact Damage, Meteoroid Showers, Astronomy, Geology, Micrometeorites, Paleontology, Tektites

Scientific paper

Three independent pieces of evidence supporting a connection between comet showers and clustering in terrestrial cratering and mass extinctions are presented. The temporal profile of a comet shower triggered by a star passing through the Oort cloud is calculated. Four weak peaks are found in the age of distribution of impact craters over the past 100 Myr, as well as two compact clusters of ages of impact glass broadly coincident with crater-age peaks. Recent paleontological observations are reviewed that indicate a stepwise character for some well-documented mass extinctions in the past 100 Myr which roughly coincide with three of the four peaks in crater ages and which have a duration compatible with comet shower predictions.

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