A team of palaeontologists at the University of Kansas called it the “mother lode of exquisitely preserved animal and fish fossils” in their research paper.
Robert DePalma, the report’s lead author, said debris was blasted across the globe and the resulting surge left “a tangled mass of freshwater fish, terrestrial vertebrates, trees, branches, logs, marine ammonites and other marine creatures”.
Mr DePalma added the debris could have reached North Dakota within “tens of minutes”, although the most northern parts of the US were slightly closer to Mexico 66 million years ago than they are now.
Co-author David Burnham added: “The sedimentation happened so quickly everything is preserved in three dimensions – they’re not crushed.