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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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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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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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Strontium Isotope Stratigraphy - http://www.ucl.ac.uk/geolsci/research/geochemistry/sis/
Describes this method, used primarily to date marine sediments, and provides access to the global seawater strontium curve and a user-friendly table for converting 87Sr/86Sr values to numerical ages. |
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Geological Time - http://rainbow.ldeo.columbia.edu/courses/v1001/geotime2.html
Lecture notes on different methods of measuring geologic time. |