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1. Ypresian: In the geologic timescale the Ypresian is the oldest age or lowest stratigraphic stage of the Eocene. It spans the time between 56 and 47.8 Ma, is preceded by the Thanetian Age (part of the Paleocene) and is followed ... (Earth) [100%] 2023-11-18 [Ypresian] [Eocene geochronology]...