Frasnian
Period
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The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from 382.7 million years ago to 372.2 million years ago. It was preceded by the Givetian Stage and followed by the Famennian Stage.
Major reef-building was under way... Wikipedia
Occurred: 382.7 (+/- 1.6) million years ago - 372.2 (+/- 1.6) million years ago
Epoch: Upper Devonian
Lower boundary definition: FAD of the conodont Ancyrodella rotundiloba
Lower boundary GSSP: Col du Puech de la Suque, Montagne Noire, France; 43°30′12″N 3°05′12″E / 43.5032°N 3.0868°E
Lower GSSP ratified: 1986
Upper boundary GSSP: Coumiac quarry, Montagne Noire, France; 43°27′41″N 3°02′25″E / 43.4613°N 3.0403°E
Upper GSSP ratified: 1993