: Puzzling elliptical depressions along the U.S. Atlantic coast that the authors link to the impact event.

The authors highlight several geological markers to support their theory:

: 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.

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

: Discoveries of radioactive mammoth bones and magnetic microspherules in specific sediment layers.