Cretaceous extinctions - Evidence for wildfires and search for meteoritic material

Details Cretaceous extinctions - Evidence for wildfires and search for meteoritic material Cretaceous extinctions - Evidence for wildfires and search for meteoritic material

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985sci...230..167w&link_type=abstract

Science (ISSN 0036-8075), vol. 230, Oct. 11, 1985, p. 167-170.

Biology

82

Extinction, Meteorite Collisions, Paleobiology, Carbon, Clays, Meteoritic Composition, Organic Compounds, Particle Size Distribution, Sediments, Soot

Scientific paper

The results of analyses of the contents of deposits in the Cretaceous-Ternary (K-T) transition at three sites worldwide are discussed. The study was undertaken to examine the composition of the object which may have struck the earth, causing widespread biotic extinction. The data indicate that most of the parent body was destroyed on impact, a condition which would also hold true for comets, suggesting that comets were not a source of prebiotic life. A four-orders-of-magnitude excess of carbon in the K-T layer is considered in terms of its source, which is suspected to be deposits from wildfires. The consequent extinctions of species are regarded as possibly making the current nuclear winter scenarios too optimistic.

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