Technical Comments

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.1159174

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Abstract

Paquay et al. (Reports, 11 April 2008, p. 214) reported that osmium isotope ratios in marine sediments can be used to determine the size of a chondritic impactor. Their assumptions on the fate of an impacting projectile may need to be reassessed, however, because only a small, unpredictable fraction of the impactor ends up dissolved in seawater.

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