A new study suggests that the Earth’s oceans may have changed color over time and could change again in the future, depending ...

We will provide a list of web sites with relevant information. The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ...

They created the geological timescale to do this, enabling geologists in particular to describe and convey their findings in a way that fellow geologists understand. Eons are the broadest category.