Welcome to the geological timeline of Yellowstone Park. Click on any time period listed below to read more about it, or start at the beginning and work your way from the earliest known facts of the part right up until present day.
5.4 billion-600 millions years ago
600-75 million years ago
75-55 million years ago
55-40 million years ago
40-2 million years ago
2 million-600 thousand years ago
300-8.5 thousand years ago
Present Day
