Rupelian
Geologic period
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The Rupelian is, in the geologic timescale, the older of two ages or the lower of two stages of the Oligocene Epoch/Series. It spans the time between 33.9 and 27.82 Ma. It is preceded by the Priabonian Stage and is followed by the Chattian Stage. Wikipedia
Occurred: 33.9 million years ago - 28.1 million years ago
Epoch: Oligocene
Age: 33.9 million to 28.1 million years ago
Lower boundary definition: LAD of Planktonic Foraminiferans Hantkenina and Cribrohantkenina
Lower boundary GSSP: Massignano quarry section, Massignano, Ancona, Italy; 43°31′58″N 13°36′04″E / 43.5328°N 13.6011°E
Lower GSSP ratified: 1992
Upper boundary definition: LAD of the Planktonic Foraminifer Chiloguembelina (Base of Foram Zone P21b)