230 million years ago · approximate date
The first dinosaurs
Dinosaurs appear and hold the land for the next 164 million years.
Dinosaurs arose in the Triassic and held the land for about 164 million years, far longer than mammals have managed so far. They ranged from small runners to the largest animals ever to walk on land.
- Period
- Triassic
- Earth's history already passed
- 94.9339 percent
- 4.54 kilometres
- 230 metres from the end
- One day
- 22:47:02
- One year
- December 13, 12:12
Source: Smithsonian National Museum of Natural History · Source to be verified