Asselian
Period
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In the geologic timescale, the Asselian is the earliest geochronologic age or lowermost chronostratigraphic stage of the Permian. It is a subdivision of the Cisuralian Epoch or Series. The Asselian lasted between 298.9 and 293.52 million years... Wikipedia
Epoch: Cisuralian
Occurred: 298.9 (+/- 0.15) million years ago - 295 (+/- 0.18) million years ago
Age: between 298.9 and 293.52 million years ago
Lower boundary definition: FAD of the Conodont Streptognathodus isolatus within the morphotype Streptognathodus wabaunsensis chronocline
Lower boundary GSSP: Aidaralash, Ural Mountains, Kazakhstan; 50°14′45″N 57°53′29″E / 50.2458°N 57.8914°E
Lower GSSP ratified: 1996
Stratigraphic unit: Stage