Deep time in the Arizona desert.
| When | What Happened |
|---|---|
| 1.7 billion years ago | Vishnu Schist forms at the bottom of the Grand Canyon |
| 270 million years ago | Kaibab Limestone forms the Grand Canyon rim |
| 225 million years ago | Forests buried that become the Petrified Forest |
| 5 to 6 million years ago | Colorado River begins carving the Grand Canyon |
| About 50,000 years ago | Meteor Crater formed by an impact |
| About 1085 AD | Sunset Crater erupts near Flagstaff |