WIDESPREAD PLATINUM ANOMALY DOCUMENTED AT THE YOUNGER DRYAS ONSET IN NORTH AMERICAN SEDIMENTARY SEQUENCES CONSISTENT WITH GREENLAND ICE CORE DATA
Petaev et al. (2013) suggested a likely extraterrestrial source of Pt from the impact of a sub-kilometer iron meteorite with an unusual fractionated core highly enriched in Pt. Although this study finds no evidence to contradict the conclusions of Petaev et al. that the Greenland Pt enrichment most likely resulted from an extraterrestrial source, there is some question about the type of impactor and whether the Pt originated from the impactor and/or from target rocks. In addition, our findings show no contradiction with the Younger Dryas impact hypothesis (YDIH), although detailed evidence for such an impact or airburst is beyond the scope of this research. We expect the Pt anomaly to serve as a widely-distributed time marker horizon (datum) for identification and correlation of the onset of the YD climatic episode at 12,800 Cal B.P. Furthermore, this Pt datum will likely prove valuable in dating and correlating archaeological, paleontological, and paleoenvironmental data between sequences, especially those with limited age control.