Here is a list of papers I've found that discuss the Younger Dryas impact hypothesis (YDIH), which was originally proposed by Firestone et al. (2007). Supporting (20): Bunch, T.E. et al. (2012). Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago. Proceedings of the National Academy of Sciences, 109(28), 1903-1912. Firestone, R.B. et al. (2007). Evidence for an extraterrestrial impact 12,900 years ago that contributed to the
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