Christian Koeberl and Francisca Martinez-Ruiz, eds., 2003, Springer-Verlag, Berlin, 347 p. (Hardcover, US $99.00) ISBN: 3-540-00630-3.

A globally distributed layer of impact ejecta offers a stratigraphic horizon that can precisely tie diverse sections together (e.g., Alvarez et al., 1980 and Tschudy et al., 1984). Learning to recognize these layers can advance stratigraphic correlations and help synchronize paleobiological changes recorded for different paleoecosystems in different parts of the world. Patterns of extinction, survivorship, and evolutionary recovery in biostratigraphic sequences also can be better assessed if a temporally specific layer, such as impact debris, is part of the sections. In addition,...

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