Scientists say a meteor impact 66 million years ago generated a tsunami-like wave in an inland sea that killed and buried fish, mammals, insects and a dinosaur. (Illustration courtesy of Robert DePalma)More

First, there was a violent shock. Then, there was the roar of a 30-foot-high wave of water, throwing fish onto a sandbar in what is now North Dakota. Then there was a hail of molten rock, pelting dying fish and soon-to-be-dying land creatures. Then the fires began.

That’s how the doom of the dinosaurs began, nearly 66 million years ago, according to a study to be published in the Proceedings of the National Academy of Sciences next week.

For decades, scientists have surmised that the doom came about when a giant asteroid or comet struck Earth

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