Dinosaur impact theory challenged
Scientists have cast doubt on the well-established theory that a single, massive asteroid strike killed off the dinosaurs 65 million years ago. New data suggests the Chicxulub crater in Mexico, supposedly created by the collision, predates the extinction of the dinosaurs by about 300,000 years… Understandably, the team's conclusions have met with strong opposition. "It appears to contradict many other lines of evidence that seem rather unambiguously to indicate that the [Chicxulub] crater formed at the K-T boundary," said Dr David Kring of the University of Arizona, US.