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 …

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 …

We present evidence that in~ 1650 BCE (~ 3600 years ago), a cosmic airburst destroyed
Tall el-Hammam, a Middle-Bronze-Age city in the southern Jordan Valley northeast of the …

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

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 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 At Abu Hureyra (AH), Syria, the 12,800-year-old Younger Dryas boundary layer
(YDB) contains peak abundances in meltglass, nanodiamonds, microspherules, and …

A major cosmic-impact event has been proposed at the onset of the Younger Dryas (YD)
cooling episode at≈ 12,800±150 years before present, forming the YD Boundary (YDB) …

Previously, a large platinum (Pt) anomaly was reported in the Greenland ice sheet at the
Younger Dryas boundary (YDB)(12,800 Cal BP). In order to evaluate its geographic extent …

The progress of science has sometimes been unjustifiably delayed by the premature
rejection of a hypothesis for which substantial evidence existed and which later achieved …