Directorio | Ciencias de la Tierra | Geología | Eras Geológicas

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British Geological Survey - The Geological Time Scale Detailed interactive geological time scale outlining earth"s major eras and stratigraphic layers.	British Geological Survey Time Scale Official geological timechart and stratigraphy information.
Escala de tiempo geológico Escala de tiempo geológico	Geologic Time discussion of how geoscientists determine age of rocks on the earth
Geology.com - Geologic Time Scale Informational overview of the Earth"s history, eras, and major geological extinction events.
International Commission on Stratigraphy Official global standard for the geological time scale, defining eras, periods, and geochronology.
UCMP Berkeley - Geologic Time Scale Comprehensive educational resource on the geological eras, periods, and evolutionary history of Earth.
US Geological Survey - Geologic Time Scale Official publication and chart detailing the division of geological time into eras and epochs.