Technical Comments

Response to Comment on "Determining Chondritic Impactor Size from the Marine Osmium Isotope Record"

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Science  29 Aug 2008:
Vol. 321, Issue 5893, pp. 1158
DOI: 10.1126/science.1159234

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Morgan argues that excursions in the marine Os record are of little value for estimating impactor size. This claim is based on computer simulations of the formation of the Chicxulub crater and distribution of the ejecta, which are difficult to validate. More important, by narrowly focusing on the Cretaceous-Tertiary event Morgan's comment misses the broader implications of our study.

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