Frasnian
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The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from Expression error: Unexpected round operator million years ago to Expression error: Unexpected round operator 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 orogeny 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 percent, the minimum necessary to sustain wildfires.[1]
North American subdivisions of the Frasnian include
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.[2] It is named after the village of Frasnes-lez-Couvin, in the district of Couvin, in Belgium.[3]
References
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- ^ Page Module:Citation/CS1/styles.css has no content.McGhee, George R. Jr. (12 November 2013). When the Invasion of Land Failed: The Legacy of the Devonian Extinctions. Columbia University Press. pp. 110–11. ISBN 978-0-231-16057-5. Retrieved 21 April 2015.
- ^ Page Module:Citation/CS1/styles.css has no content.Coen-Aubert, Marie; Boulvain, Frédéric (2006). "Frasnian". Geologica Belgica. 9 (1–2): 19–25. Retrieved 10 March 2013.[permanent dead link]
- ^ Page Module:Citation/CS1/styles.css has no content."Frasnian mudmounds from Belgium". University of Liège. Archived from the original on 2011-07-06. Retrieved 2011-02-25.
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