ONE of the few remaining objections to the idea that an asteroid killed off the dinosaurs has been put to rest. The giant tsunami caused by the impact may have scrambled fossil evidence, explaining puzzling finds that suggested the asteroid and the mass extinction were unrelated.
Many geologists have long argued that the Cretaceous period ended when a 10-kilometre-wide asteroid slammed into the Gulf of Mexico, just off the Yucat´n coast. That point in history bears the hallmarks of a global disaster – mass extinction, a giant crater, impact debris such as solidified rock droplets, and traces of iridium typical…
