The Cycle Of Cosmic Catastrophes: How A Stone-a... -

: Distinctive carbon-rich soil layers found at numerous sites, which the authors believe represent the fallout from global wildfires and flooding. Scientific Reception

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The Cycle of Cosmic Catastrophes: How a Stone-Age Comet Changed the Course of World Culture : Distinctive carbon-rich soil layers found at numerous

: Some scientists argue that the evidence, such as the "black mats," can be explained by natural environmental changes rather than a comet. Others point out the lack of a clear, single impact crater from this specific timeframe. The Cycle of Cosmic Catastrophes: How a Stone-Age

: A massive comet or fleet of comets struck or exploded over North America around 12,900 years ago, an occurrence the authors simply call "the Event".