Clay mineralogy of the Cretaceous-Tertiary boundary clay

Analyses of the clay mineralogy of samples from the Cretaceous-Tertiary boundary layer at four localities show that the boundary clay is neither mineralogically exotic nor distinct from locally derived clays above and below the boundary. The significant ejecta component in the clay that is predicted...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1983-02, Vol.219 (4584), p.495-498
Main Authors: Rampino, Michael R., Reynolds, Robert C.
Format: Article
Language:English
Subjects:
Boundary layers
Clay minerals
Clays
Ejecta
Illite
Kaolinite
Limestones
Marine
Materials
Mineralogy
Minerals
Smectite
Soil chemistry
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Summary:Analyses of the clay mineralogy of samples from the Cretaceous-Tertiary boundary layer at four localities show that the boundary clay is neither mineralogically exotic nor distinct from locally derived clays above and below the boundary. The significant ejecta component in the clay that is predicted by the asteroid-impact scenario was not detected.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.219.4584.495