edades de la tierra|Historia de la Tierra,megan nutt

Las eras geológicas son un tipo de división del tiempo geológico, es decir, de la escala utilizada para medir la historia del planeta y de la vida desde sus comienzos.

Las eras geológicas se evidencian a paredades de la tierratir del registro fósil y de la constitución de las capas sedimentarias de la corteza terrestre, y permiten clasificar y datar temporalmente los hallazgos que hagamos mediante excavaciones, como。

In 1862, the physicist William Thomson, 1st Baron Kelvin published calculations that fixed the age of Earth at between 20 million and 400 million years. He assumed that Earth had formed as a completely molten object, and determined the amount of time it would take for the near-surface temperature gradient to decrease to its present value. His calculations did not account for heat produced

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