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The geology or deep time of Earth's past has been organized into various units according to events which took place.Different spans of time on the GTS are usually marked by corresponding changes in the composition of strata which indicate major geological or paleontological events, such as mass extinctions.

Older time spans, which predate the reliable fossil record (before the Proterozoic eon), are defined by their absolute age.In the late 17th century Nicholas Steno (1638–1686) pronounced the principles underlying geologic (geological) time scales.Steno argued that rock layers (or strata) were laid down in succession, and that each represents a "slice" of time.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.For example, in North America, the Lower Cambrian is called the Waucoban series that is then subdivided into zones based on succession of trilobites.

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Apart from the Late Heavy Bombardment, events on other planets probably had little direct influence on the Earth, and events on Earth had correspondingly little effect on those planets.