End-Cretaceous mass extinction event - Argument for terrestrial causation

Details End-Cretaceous mass extinction event - Argument for terrestrial causation End-Cretaceous mass extinction event - Argument for terrestrial causation

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...238.1237h&link_type=abstract

Science (ISSN 0036-8075), vol. 238, Nov. 27, 1987, p. 1237-1242.

Mathematics

Logic

58

Biological Evolution, Comets, Extinction, Plates (Tectonics), Stratigraphy, Geochemistry, Geochronology, Meteoroid Showers, Radioactive Age Determination

Scientific paper

The end-Cretaceous mass extinctions were not a geologically instantaneous event and were selective in character. These features are incompatible with the original Alvarez hypothesis of their being caused by a single asteroid impact that produced a world-embracing dust cloud with devastating environmental consequences. By analysis of physical and chemical evidence from the stratigraphic record it is shown that a modified extraterrestrial model in which stepwise extinctions resulted from encounter with a comet shower is less plausible than one intrinsic to the earth, involving significant disturbance in the mantle.

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