Ypresian
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In the geologic timescale the Ypresian is the oldest age or lowest stratigraphic stage of the Eocene. It spans the time between 56 and 48.07 Ma, is preceded by the Thanetian Age and is followed by the
Earth ~50 mya
Klondike Mountain Formation, Republic, Washington
Lutetian
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The Lutetian is, in the geologic timescale, a stage or age in the Eocene. It spans the time between 48.07 and 41.03 Ma. The Lutetian is preceded by the Ypresian and is followed by the Bartonian. Toget
Ypresian
…stage of the Eocene. It spans the time between 56 and 48.07 Ma, is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the Lower Eocene (Early Eocene). The Ypresian Age begins during the throes of the Paleocene–Eocene Thermal Maximum…
Global stratotype for the base of the Lutetian Stage