Abstract Firestone et al., 2007, PNAS 104 (41): 16,016–16,021, proposed that a major
cosmic impact, circa 10,835 cal. BCE, triggered the Younger Dryas (YD) climate shift along …

A series of publications purport to provide evidence that the Earth was subjected to an
extraterrestrial event or events at∼ 12.9 ka creating an environmental cataclysm and the …

According to the Younger Dryas Impact Hypothesis (YDIH),∼ 12,800 calendar years before
present, North America experienced an extraterrestrial impact that triggered the Younger …

Wolbach et al. published two papers on the Younger Dryas Impact Hypothesis (YDIH)—the
paleoenvironmental effects of a purported cosmic impact at the beginning of the Younger …

In this paper we review the evidence for the Younger Dryas impact hypothesis (YDIH), which
proposes that at∼ 12.9 k cal a BP North America, South America, Europe and the Middle …

Part 1 of this study investigated evidence of biomass burning in global ice records, and here
we continue to test the hypothesis that an impact event at the Younger Dryas boundary …

The earliest form of the “Younger Dryas (YD) impact hypothesis” was published by Firestone
and Topping [2001] and was substantially extended in a book by Firestone et al.[2006] …

The Younger Dryas impact hypothesis posits that a cosmic impact across much of the
Northern Hemisphere deposited the Younger Dryas boundary (YDB) layer, containing peak …

Abstract The Younger Dryas boundary (YDB) cosmic-impact hypothesis is based on
considerable evidence that Earth collided with fragments of a disintegrating≥ 100-km …

The Younger Dryas (YD) impact hypothesis is a recent theory that suggests that a cometary
or meteoritic body or bodies hit and/or exploded over North America 12,900 years ago …