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For example, the lower Jurassic Series in chronostratigraphy corresponds to the early Jurassic Epoch in geochronology.

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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.

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.

Therefore, the second timeline shows an expanded view of the most recent eon.

In a similar way, the most recent era is expanded in the third timeline, and the most recent period is expanded in the fourth timeline.

Corresponding to eons, eras, periods, epochs and ages, the terms "eonothem", "erathem", "system", "series", "stage" are used to refer to the layers of rock that belong to these stretches of geologic time in Earth's history.

Geologists qualify these units as "early", "mid", and "late" when referring to time, and "lower", "middle", and "upper" when referring to the corresponding rocks.

The geology or deep time of Earth's past has been organized into various units according to events which took place.

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