How Long is An Epoch?

In a geologic time frame, Epochs divide Periods into smaller chunks, and the lengths of Epochs range in the tens of millions of years. In the most recent Era, the Cenozoic, they have ranged from 2 million to 22 million years long. There have been seven Epochs in the last 70 million years or so, and the current Epoch is called the Holocene. You can see the Geologic Time Scale at