It's a hard-fought paleontological debate. Did the massive asteroid that struck Earth 66 million years ago wipe out a thriving and diverse population of dinosaurs, or were they already struggling to survive when that cataclysmic day dawned?

Most information on dinosaurs at the end of the Cretaceous era comes from what is now the United States, particularly the Hell Creek Formation, which provides a picture of relatively rich dinosaur diversity during the final million years of that period.

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