human
I have a question about the epoch of the Mesozoic Era. When did the extinction of the dinosaurs occur?
assistant
The extinction of the dinosaurs occurred 65 million years ago. The extinction of the dinosaurs is often referred to as the Cretaceous-Tertiary extinction event, and it is the most well-known mass extinction event in Earth's history. The extinction of the dinosaurs is thought to have been caused by a series of asteroid impacts that occurred 65 million years ago.