Frasnian

System/ Period	Series/ Epoch	Stage/ Age	Age (Ma)
Carboniferous	Mississippian	Tournaisian	recent
Devonian	Late	Famennian	372.2–358.9
		Frasnian	382.7–372.2
	Middle	Givetian	387.7–382.7
		Eifelian	393.3–387.7
	Early	Emsian	407.6–393.3
		Pragian	410.8–407.6
		Lochkovian	419.2–410.8
Silurian	Pridoli	no faunal stages defined	older
Subdivision of the Devonian system according to the ICS.

The Frasnian is one of two faunal stages in the Late Devonian period. It lasted from 382.7 ± 1.6 million years ago to 372.2 ± 1.6 million years ago. It was preceded by the Givetian stage and followed by the Famennian stage.

Major reef-building was under way during the Frasnian stage, particularly in western Canada and Australia. On land, the first forests were taking shape. In North America, the Antler and Taconic orogenies peaked, which were contemporary with the Bretonic phase of the Variscan orogeny in Europe.

The Frasnian coincides with the second half of the "charcoal gap" in the fossil record, a time when atmospheric oxygen levels were below 13%, the minimum necessary to sustain wildfires.

North American subdivisions of the Frasnian include

• West Falls Group
• Sonyea Group
• Genesee Group

Name and definition

The Frasnian stage was proposed in 1879 by French geologist Jules Gosselet and was accepted for the lower stage of the Upper Devonian by the Subcommission on Devonian Stratigraphy in 1981. It is named after the village of Frasnes-lez-Couvin in Belgium.