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Berkeley Geochronology Center
Non-profit scientific research institution dedicated to establishing the history of the Earth, its various inhabitants, and its interactions with the rest of our Solar System, throughout the 4.6 billion years of our Planet's existence.
USGS on-line publication about the relative and radiometric geologic time scales, age of the earth, index fossils, and related topics.
Lecture notes on different methods of measuring geologic time.
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