Frasnian
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The Frasnian is one of two faunal stages in the Late Devonian epoch. It lasted from 385.3 ± 2.6 million years ago to 374.5 ± 2.6 million years ago. It was preceded by the Givetian stage and followed by the Famennian stage. It is named after the village of Frasnes-lez-Couvin in Belgium.[1]
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.
North American subdivisions of the Frasnian include Senecan, Sonyea, Sonyean, and West Falls.
[edit] References
- ^ "Frasnian mudmounds from Belgium". University of Liège. http://www2.ulg.ac.be/geolsed/site_MM/. Retrieved 2011-02-25.
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