To start with the Earth is approximately 4.54 Billion years old – plus or minus 50 million years.
This Geologic Time website is one of the most thorough sites available.
The Eons, Eras and most Periods have links that take you to just about anything you want to know about that portion of geologic time.
There is much to learn through Geologic Time…
Geologic History from The Virtual Fossil Museum- http://www.fossilmuseum.net/GeologicalHistory.htm
&&&– If, by some chance, you do not find what you are looking for, please use the Contact link and help will be on the way!