Chattian
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 (the lowest stage of the Miocene).
| Chattian | |||||||||||||
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| Chronology | |||||||||||||
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| Formerly part of | Tertiary Period/System | ||||||||||||
| Etymology | |||||||||||||
| Name formality | Formal | ||||||||||||
| Usage information | |||||||||||||
| Celestial body | Earth | ||||||||||||
| Regional usage | Global (ICS) | ||||||||||||
| Time scale(s) used | ICS Time Scale | ||||||||||||
| Definition | |||||||||||||
| Chronological unit | Age | ||||||||||||
| Stratigraphic unit | Stage | ||||||||||||
| Time span formality | Formal | ||||||||||||
| Lower boundary definition | LAD of the Planktonic Foraminifer Chiloguembelina (Base of Foram Zone P21b) | ||||||||||||
| Lower boundary GSSP | Monte Cagnero, Central Apennines, Italy 43.6466°N 13.4677°E | ||||||||||||
| Lower GSSP ratified | September 2016 | ||||||||||||
| Upper boundary definition |
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| Upper boundary GSSP | Lemme-Carrosio Section, Carrosio, Italy 44.6589°N 8.8364°E | ||||||||||||
| Upper GSSP ratified | 1996 | ||||||||||||
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