In an astounding paleontological discovery, scientists have found direct evidence of animals dying in the hours following the impact that took out 75 per cent of the world's species 66 million years ago in a rock outcrop in North Dakota. | CBCQuirks
Sixty-six million years ago, the site in what is now North Dakota was a lush terrestrial river valley, about 3,000 kilometres from where a 10-km wide asteroid or comet would strike the Yucatan penininsula.
"We have particles of debris from the impact that are encapsulated by the deposit and were essentially dropped there while the deposit was forming," said DePalma.Then a surge of roiling muddy water containing animals, plants and trees, came roaring up this river valley. DePalma said they originally thought was a tsunami wave, but the timing of the arrival of that wave didn't make sense with what they saw in the rocks. A tsunami would have taken much longer to get to North Dakota.
To cap off the layers from that day is a layer of Iridium-bearing rock — leftover from the vaporized asteroid or comet — that fell back down to Earth.The rapid sequence of events was fortunate for the scientists because it meant what was left behind was a jumble of species packed that were buried "almost like a sardine can."
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