Chattian
Geologic period
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The Chattian is, in the geologic timescale, the younger of two ages or upper of two stages of the Oligocene Epoch/Series. It spans the time between 27.82 and 23.03 Ma. The Chattian is preceded by the Rupelian and is followed by the Aquitanian. Wikipedia
Epoch: Oligocene
Occurred: 28.1 million years ago - 23.03 million years ago
Chronological unit: Age
Lower boundary definition: LAD of the Planktonic Foraminifer Chiloguembelina (Base of Foram Zone P21b)
Lower boundary GSSP: Monte Cagnero, Central Apennines, Italy; 43°38′48″N 13°28′04″E / 43.6466°N 13.4677°E
Lower GSSP ratified: September 2016
Organisms
