Eritema

the Eritema (from the Latin. aera – a single number, the original number, era and the Greek. thema – base, the law), a group, a major subdivision of the stratigraphic scale, complex deposits formed during the same era. Eritema into the system. The last three Eritems (Paleozoic, Mesozoic and Cenozoic) are combined in Phanerozoic eonothem.

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