The fundamental role of giant comets in earth history

Details The fundamental role of giant comets in earth history The fundamental role of giant comets in earth history

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992cemda..54..179c&link_type=abstract

Celestial Mechanics and Dynamical Astronomy (ISSN 0923-2958), vol. 54, no. 1-3, p. 179-193.

Astronomy and Astrophysics

Astronomy

3

Asteroid Belts, Comets, Earth Surface, Geochronology, Galactic Structure, Oort Cloud, Perturbation Theory

Scientific paper

We discuss some fundamental aspects of earth history as predicted by what has come to be called 'coherent' rather than 'stochastic' catastrophism. The latter essentially seeks to provide an understanding of terrestrial evolution in terms of occasional kilometer-plus impactors from the asteroid belt whereas the former recognizes a far more complex extraterrestrial regime arising from the streams of sub-kilometer and kilometer-plus debris due to the disintegration of successive giant comets in sub-Jovian orbits. Periodicities of about 15 Myr during the later Phanerozoic (i.e. about 250 to 0 Myr BP) and about 200 yr during the Holocene (i.e. about 10,000 to 0 yr BP) are likely fundamental signatures in the terrestrial record relating to the action of past and present giant comets respectively.

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