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A key aspect of the work of the International Commission on Stratigraphy is to reconcile this conflicting terminology and define universal horizons that can be used around the world.

Some other planets and moons in the Solar System have sufficiently rigid structures to have preserved records of their own histories, for example, Venus, Mars and the Earth's Moon.

Dominantly fluid planets, such as the gas giants, do not preserve their history in a comparable manner.

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.

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Construction of a time scale that links the planets is, therefore, of only limited relevance to the Earth's time scale, except in a Solar System context.

The existence, timing, and terrestrial effects of the Late Heavy Bombardment is still debated.

In East Asia and Siberia, the same unit is split into Alexian, Atdabanian, and Botomian stages.Geologists qualify these units as "early", "mid", and "late" when referring to time, and "lower", "middle", and "upper" when referring to the corresponding rocks.For example, the lower Jurassic Series in chronostratigraphy corresponds to the early Jurassic Epoch in geochronology.The three million year Quaternary period, the time of recognizable humans, is too small to be visible at this scale.The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.

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