Quantum redactiones paginae "Aera (geologia)" differant

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Summarium vacuum
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== Nexus externi ==
* ''[httphttps://www.stratigraphy.org/index.php/ics-chart-timescale International Chronostratigraphic Chart]'' variis linguis edita
* Michael A. Murphy, Amos Salvador, "[https://web.archive.org/web/20200302101823/http://www.stratigraphy.org/upload/bak/chron.htm Chronostratigraphic Units]" (2009)