https://gcmdservices.gsfc.nasa.gov/kms/concept/9388f3a4-18df-45f6-ba3d-7a78579f6a6d
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definition | 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 28.1 and 23.03 Ma. The Chattian is preceded by the Rupelian and is followed by the Aquitanian (the lowest stage of the Miocene). | ||||||
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in scheme | chronounits original |