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Eras geológicas, espiral al presente

Representación gráfica de la historia de la Tierra en forma de espiral ascendente.

Wikimedia Commons.

Tomada de: United States Geological SurveyGraham, Joseph, Newman, William, and Stacy, John, 2008, The geologic time spiral—A path to the past (ver. 1.1): U.S. Geological Survey General Information Product 58, poster, 1 sheet.

PDF disponible en:    http://pubs.usgs.gov/gip/2008/58/

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