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

: 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 Comet Changed the Course of World Culture The Cycle of Cosmic Catastrophes: How a Stone-A...

: The book suggests Earth is subject to a recurring cycle of catastrophes and that we may be entering a new period of increased danger from space. Scientific Evidence Presented : Some scientists argue that the evidence, such