Geophysics

Impact Revisited

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Science  12 Jan 2001:
Vol. 291, Issue 5502, pp. 211
DOI: 10.1126/science.291.5502.211e

In a recent paper, Mory et al. suggested that a large impact crater might be buried in western Australia. The size of this crater would make it one of the largest impacts in the last 600 million years, and the range of possible dates of the impact would span several major extinction events including the end-Permian and end-Triassic extinctions.

Reimold and Koeberl now question whether an impact structure has been appropriately identified, both with respect to the deformation features identified in rocks and minerals sampled from drill cores and in the geophysical data of the structure itself. Mory et al. reply by providing additional images and discussion of the claimed shock features as well as some new age information on alteration in the basement rocks. — BH

Earth Planet. Sci. Lett.177, 119 (2000); Earth Planet. Sci. Lett.184, 353 (2000); Earth Planet. Sci. Lett.184, 358 (2000).

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