Geologic Time

Geologic Time is subdivided into a number of categories.

1. Eons are divided into...
2. Eras which are divided into...
3. Periods and subperiods which are divided into...
4. Epochs. (Epochal subdivisions are referred to as "ages")
5. MYA = millions of years ago
6. THE PRESENT IS THE KEY TO THE PAST

Traditional Geological Time Scale