Directory Sites

  • Geological Time

    Lecture notes on different methods of measuring geologic time.

    rainbow.ldeo.columbia.edu

  • Geologic Time

    USGS on-line publication about the relative and radiometric geologic time scales, age of the earth, index fossils, and related topics.

    pubs.usgs.gov

  • 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.

    www.bgc.org

  • Web Time Machine

    Geologic time scale with links for each time interval.

    www.ucmp.berkeley.edu

  • Geochronology Working Group at Vienna University

    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.

    www.univie.ac.at

  • Synoptic Time Table of Earth History

    Chart correlates geologic, paleontologic, and absolute time scales, also including glaciations.

    www.bechly.de

  • Strontium Isotope Stratigraphy

    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.

    www.ucl.ac.uk

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