This cool chart shows how the Earth was shaped and what animals lived on it throughout the planet's
history. It's broken down into eons, eras, and periods. Throughout this website we will talk about
either how old a fossil is estimated to be or what period they belong to. This chart will help you
determine approximately how old your fossil is. The measurements are in millions of years so please
don't expect to know the fossil's exact birthday!! You will also hear of the following time periods:
Paleocene. Eocene. Oligocene, Miocene, Pliocene Pleistocene, and Holocene (recent). All of these
time periods occurred during the Tertiary Period.