Catastrophes: How A Stone-a... | The Cycle Of Cosmic
: This catastrophe is cited as the primary cause for the sudden disappearance of North American megafauna, such as mammoths and saber-toothed tigers, as well as the collapse of the Paleo-Indian Clovis culture.
: More recent studies have found similar geochemical signals (like high platinum and iridium levels) at dozens of sites worldwide, keeping the debate active in the scientific community. The Cycle of Cosmic Catastrophes: How a Stone-A...
While many readers find the narrative compelling, the "Younger Dryas Impact Hypothesis" remains controversial. : This catastrophe is cited as the primary
: 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". : A massive comet or fleet of comets
: Discoveries of radioactive mammoth bones and magnetic microspherules in specific sediment layers.
: Puzzling elliptical depressions along the U.S. Atlantic coast that the authors link to the impact event.