Figure X. Competing Models for the Younger Dryas Boundary Event (~12,900 years ago).
Left: Comet Impact Hypothesis — fragments of a disintegrating comet or asteroid strike Earth’s atmosphere, creating widespread airbursts and fallout (nano-diamonds, melt spherules, soot). This model requires multiple incoming bolides but has no confirmed crater.
Right: Flash Strike Hypothesis (Montez, 2025) — a directed solar energy discharge (“flash strike”) impacts Earth’s surface. The 2–3 mile thick North Atlantic ice sheet absorbs much of the impact energy, preserving Earth’s crust from catastrophic disruption. The symmetrical circular fallout pattern (diamonds, soot, glass) across the Northern Hemisphere is interpreted here as a solar-origin signature rather than a cometary scatter field.
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