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[Belcher et al. (2003)][1] reported that at six locations across North America quantities of charcoal in the Cretaceous-Tertiary (K-T) boundary clay are about an order of magnitude below background levels. They interpreted this absence of charcoal as evidence for the absence of a global

geology

Fireball passes and nothing burns—The role of thermal radiation in the Cretaceous-Tertiary event: Evidence from the charcoal record of North America: Comment and Reply