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: 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". The Cycle of Cosmic Catastrophes: How a Stone-A...
: 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. This book is available through various retailers, including