To start with the Earth is approximately 4.54 Billion years old – plus or minus 50 million years.
http://www.fossilmuseum.net/GeologicalTimeMachine.htm
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…
Virtual Fossil Museum
Geologic History from The Virtual Fossil Museum- http://www.fossilmuseum.net/GeologicalHistory.htm
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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