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 Time Spiral
Virtual Fossil Museum

Geologic History from The Virtual Fossil Museum-

Oldest fossil micro-organisms found on Earth in Nuvvuagittuq Greenstone Belt in Hudson Bay of northern Quebec.
The organisms are thought to be from submarine-hydrothermal vents.
Age of this rock belt ranges from 3.7 to 4.37 Billion years old!

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