TY - JOUR AB - Paquay et al. (Reports, 11 April 2008, p. 214) report that Osmium isotope ratios in marine sediments can be used to determine the size of a chondritic impacting body. Their assumptions, however, on the fate of an impacting projectile are incorrect, as only a small, unpredictable fraction of the impactor ends up dissolved in seawater. AU - Morgan,JV DO - 10.1126/science.1159174 EP - 1158 PY - 2008/// SP - 1158 TI - Comment on "Determining Chondritic Impactor Size from the Marine Osmium Isotope Record" T2 - Science UR - http://dx.doi.org/10.1126/science.1159174 UR - http://www.sciencemag.org/cgi/content/abstract/321/5893/1158a VL - 321 ER -