Mathematics – Logic
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jbaa...98...85a&link_type=abstract
Journal of the British Astronomical Association, vol.98, no.2, p.85-88
Mathematics
Logic
Earth, Collisions, Bombardment, Impacts, Living Organisms, Extinction, Hypotheses, Craters, Periodicity, Iridium, Volcanism
Scientific paper
There must have been many impacts of large extra-terrestrial bodies on the Earth, though the majority of them - as on the Moon - probably arrived in Precambrian times before the emergence of abundant life forms. It is possible that cometary or meteoritic impacts may be connected with episodes of mass extinction among many different animal and plant groups but, though the hypothesis is tempting, the geological evidence is not wholly credible. Mass extinctions are more convincingly blamed on terrestrial phenomena, such as marine transgressions, related to plate movements and thence to convection cells in the Earth's interior.
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