The presence of “ejecta” suggests the seismic surges reached North Dakota within ‘tens of minutes’, sweeping sea creatures inland and entombing them with other forms of landlocked life. “The sedimentation happened so quickly everything is preserved in three dimensions – they’re not crushed,” co-author David Burnham told The Guardian. They were killed pretty suddenly because of the violence of that water. “We look at moment-by-moment records of one of the most notable impact events in Earth’s history. No other site has a record quite like that,” said DePalma.

Source: National Post April 01, 2019 16:57 UTC