This clock representation shows some of the major units of geological time and definitive events of Earth history.
For example, the lower Jurassic Series in chronostratigraphy corresponds to the early Jurassic Epoch in geochronology.
The adjectives are capitalized when the subdivision is formally recognized, and lower case when not; thus "early Miocene" but "Early Jurassic." Geologic units from the same time but different parts of the world often look different and contain different fossils, so the same period was historically given different names in different locales.
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