Ypresian
Geologic period
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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 47.8 Ma, is preceded by the Thanetian Age and is followed by the Eocene Lutetian Age. The Ypresian is consistent... Wikipedia
Epoch: Eocene
Occurred: 56 million years ago - 47.8 million years ago
Lower boundary definition: Strong negative anomaly in δ13C values at the PETM
Lower GSSP ratified: 2003
Upper boundary definition: FAD of the calcareous nannofossil Blackites inflatus
Upper boundary GSSP: Gorrondatxe section, Western Pyrenees, Basque Country, Spain; 43°22′47″N 3°00′51″W / 43.3796°N 3.0143°W