Geochronology  

<p>Hierarchical system of defined time intervals of earth history. Based on <a href="http://www.stratigraphy.org/column.php?id=Chart/Time%20Scale">International Stratigraphic Chart, Aug. 2009</a>.</p>

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith