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Las eras geológicas se evidencian a partir 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

La evolución de este planeta es objeto de interés para los científicos, edades de la tierraquienes han dividido su historia desde el punto de vista geológico y de forma cronológica en varios eones, eras, períodos, épocas y edades, según。

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