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Web Time Machine - http://www.ucmp.berkeley.edu/help/timeform.html
Geologic time scale with links for each time interval. |
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Berkeley Geochronology Center - http://www.bgc.org/
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. |
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Geologic Time - http://pubs.usgs.gov/gip/geotime/
USGS on-line publication about the relative and radiometric geologic time scales, age of the earth, index fossils, and related topics. |
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Geochronology Working Group at Vienna University - http://lithosphere.univie.ac.at/geochronology/
Uses radiometric dating and classical geochronological methods to constrain the timing of geological processes, primarily in the Eastern Alps, the Carpathian - Pannonian region and adjoining area, and the Bohemian Massif. Includes descriptions of several isotopic techniques. |
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Geological Time - http://rainbow.ldeo.columbia.edu/courses/v1001/geotime2.html
Lecture notes on different methods of measuring geologic time. |