Eonothem (Geology terminology ⛰️)

In stratigraphy and geology, an eonothem is the totality of rock strata laid down in the stratigraphic record deposited during a certain eon of the continuous geologic timescale. The eonothem is not to be confused with the eon itself, which is a corresponding division of geologic time spanning a specific number of years, ...

https://en.wikipedia.org/wiki/Eonothem

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