A dinosaur horn is now pointing to a catastrophic end for the Age of Dinosaurs, not a gradual one as some researchers have claimed.
The leading culprit for the end of the Age of Dinosaurs is a catastrophic meteor strike about 65 million years ago. Although it is now widely accepted that a cosmic impact took place about then — a time known as the Cretaceous-Tertiary, or K-T boundary — it was unclear if the mass extinctions started gradually before the hit, perhaps due to volcanoes or other factors.