The evidence for a cosmic impact at the end of the Ice Age didn't start with craters or shocked quartz. It started with soot. Massive deposits of charcoal and ash layers, spread across continents, pointing to conflagrations on a scale that defied explanation through normal wildfire mechanisms. Once researchers began looking closer, they found the telltale signatures: microspherules formed under extreme heat, nanodiamonds created under immense pressure, platinum group metals rare at Earth's surface but common in extraterrestrial objects. Each proxy independently suggests the same conclusion, an impact event capable of igniting hemispheric-scale fires and fundamentally altering the climate and landscape of North America.
This wasn't a single researcher making a claim. It was a convergence of independent lines of evidence, each one adding weight to a hypothesis that was initially dismissed. The soot told the story of fire. The spherules told the story of vaporized rock. The nanodiamonds told the story of shock. The platinum told the story of an extraterrestrial source. When you see that kind of consilience across multiple disciplines, you have to take it seriously.
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