title: Comment on "Determining chondritic impactor size from the marine osmium isotope record".
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.
authors.affiliation: Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK. j.morgan@imperial.ac.uk
authors.forename: Joanna V
authors.initials: JV
authors.lastname: Morgan