GENERAL GEOLOGY

Detailed explanation-1: -Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period ), after living on Earth for about 165 million years.

Detailed explanation-2: -Duckbilled dinosaurs, known as hadrosaurs, were large, two-legged, plant-eating dinosaurs. All hadrosaurs died out around 65 million years ago.

Detailed explanation-3: -Cretaceous-tertiary Extinction: 65 Million Years Ago Scientists refer to the major extinction that wiped out nonavian dinosaurs as the K-T extinction, because it happened at the end of the Cretaceous period and the beginning of the Tertiary period.

Detailed explanation-4: -To explain what caused this mass extinction, scientists have focused on events that would have altered our planet’s climate in dramatic, powerful ways. The leading theory is that a huge asteroid or comet slammed into Earth 65 million years ago, blocking sunlight, changing the climate and setting off global wildfires.

Detailed explanation-5: -It was a life-altering event. Around 66 million years ago, at the end of the Cretaceous period, an asteroid struck the Earth, triggering a mass extinction that killed off the dinosaurs and some 75% of all species. Somehow mammals survived, thrived, and became dominant across the planet.