Cosmic dust: evidence of a comet shower.

Details Cosmic dust: evidence of a comet shower. Cosmic dust: evidence of a comet shower.

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998plr....18....9f&link_type=abstract

Planet. Rep., Vol. 18, No. 5, p. 9 - 11

Mathematics

Logic

Earth History: Impact Craters, Earth History: Impact Phenomena

Scientific paper

This paper describes how the relative abundance of the 3He isotope in sedimentary rocks can serve as a tracer of the cosmic dust flux reaching the Earth during recent geologic history. The author then presents the evidence, derived from his 3He abundance studies, that a devastating shower of cometary bodies struck the Earth some 35 million years ago in the late-eocene era. This result confirms the conclusions derived from the discovery of huge impact craters at Chesapeake Bay, Toms Canyon, and near the town of Popigai in northern Siberia. These impacts were dated, using either sedimentary microfossil evidence or radiometric methods, to have occurred 35 million years ago.

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