Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago - Bunch, Ted; Hermes, Robert; Moore, Andrew; Kennett, Douglas; Weaver, James C.; Wittke, James; DeCarli, Paul; Bischoff, James; Hillman, Gordon; Howard, George; Kimbel, David; Kletetschka, Gunther; et al. (Proceedings of the National Academy of Sciences of the United States of America, 2012)