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Science 29 August 2008:
Vol. 321. no. 5893, p. 1158
DOI: 10.1126/science.1159234
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Technical Comments

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

François S. Paquay,1* Gregory E. Ravizza,1 Tarun K. Dalai,2 Bernhard Peucker-Ehrenbrink3

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.

1 Department of Geology and Geophysics, University of Hawaii, Honolulu, HI 96822–2225, USA.
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721302, India.
3 Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.

* To whom correspondence should be addressed. E-mail: paquay{at}hawaii.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)