Analysis of the Cretaceous-Tertiary boundary clay Methodology questioned

Details Analysis of the Cretaceous-Tertiary boundary clay Methodology questioned Analysis of the Cretaceous-Tertiary boundary clay Methodology questioned

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sci...223..190b&link_type=abstract

Science (ISSN 0036-8075), vol. 223, Jan. 13, 1984, p. 190, 191; Author's Reply, 191.

Mathematics

Logic

Asteroids, Clays, Mineralogy, Strata, Boundary Layers, Ejecta, Impact Damage

Scientific paper

Rampino and Reynolds' study (1983) of the clay mineralogy of Cretaceous-Tertiary boundary clays from four localities, which concludes that these boundary-clay samples are neither mineralogically exotic nor distinct from clays above and below the boundary, is criticized for its analytical methods. The study encompassed only that fraction of the boundary clays smaller than two microns which, it is argued, eliminated most of the exotic materials expected from an asteroid impact. Rampino and Reynolds reply that their study was undertaken to test the prediction of the asteroid-impact model that the fine-fraction mineralogy of the layer should give some indication of an exotic origin. The lighter material would have been widely dispersed to form the dust cloud of the impact model; the heavier materials have been shown to have suffered local contamination.

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