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Santonian

Period
The Santonian is an age in the geologic timescale or a chronostratigraphic stage. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series. It spans the time between 86.3 ± 0.7 mya and 83.6 ± 0.7 mya. The Santonian is preceded... Wikipedia
Occurred: 86.3 (+/- 0.5) million years ago - 83.6 (+/- 0.2) million years ago
Lower boundary definition: FAD of the Inoceramid Bivalve Cladoceramus undulatoplicatus
Lower boundary GSSP: Olazagutia, Spain; 42°52′00″N 2°11′48″W / 42.8668°N 2.1968°W
Lower GSSP ratified: January 2013
Fossils: YPM 1177, SMM 2851, YPM 2594, and more