No fiery extinction for dinosaurs
It is unlikely the dinosaurs perished in a global firestorm triggered by the asteroid strike on Earth 65 million years ago, scientists have claimed. A popular theory suggests the impact, which was centred on Chicxulub in Mexico, generated enough energy to set off a raging worldwide inferno. But a new study shows rocks laid down at the time contain little charcoal - a possible tell-tale record of fires.