Radiometric dating of moon rocks

The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon.

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In East Asia and Siberia, the same unit is split into Alexian, Atdabanian, and Botomian stages.Older time spans, which predate the reliable fossil record (before the Proterozoic eon), are defined by their absolute age.Geologic units from the same time but different parts of the world often look different and contain different fossils, so the same time-span was historically given different names in different locales.The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.The tables of geologic time spans, presented here, agree with the nomenclature, dates and standard color codes set forth by the International Commission on Stratigraphy (ICS).

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