Preserved remains of plant and animals from the remote past are called _______________.

Approximately how old is the Earth?

This chronological time chart is broken into different time chunks, the largest being the Eon, then Era, Period, and Epoch.

These specialized fossils indicate to geologists the boundaries in geological time and determine the age of rocks.

What division of time was the longest ?

What era did dinosaurs go extinct ?

London is studying the geological time scale. Which era would London find Humans in?

In what era did the first land plants appear?