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Serpukhovian

Geologic period
The Serpukhovian is in the ICS geologic timescale the uppermost stage or youngest age of the Mississippian, the lower subsystem of the Carboniferous. The Serpukhovian age lasted from 330.9 Ma to 323.2 Ma. It is preceded by the Visean and is... Wikipedia
Occurred: 330.9 (+/- 0.2) million years ago - 323.2 (+/- 0.4) million years ago
Lower boundary definition: Not formally defined
Lower boundary GSSP candidate section(s): Verkhnyaya Kardailovka, Ural mountains; Nashui, Luodian County, Guizhou, China
Upper boundary definition: FAD of the conodont Declinognathodus nodiliferus
Upper boundary GSSP: Arrow Canyon, Nevada, USA; 36°44′00″N 114°46′40″W / 36.7333°N 114.7778°W