Frasnian
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Frasnian
System/
Period
Series/
Epoch
Stage/
Age
Age (Ma)
Carboniferous Mississippian Tournaisian younger
Devonian Upper/
Late
Famennian 358.9 372.2
Frasnian 372.2 382.7
Middle Givetian 382.7 387.7
Eifelian 387.7 393.3
Lower/
Early
Emsian 393.3 407.6
Pragian 407.6 410.8
Lochkovian 410.8 419.2
Silurian Pridoli no faunal stages defined older
Subdivision of the Devonian system
according to the ICS, as of 2017.[1]

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 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 percent, the minimum necessary to sustain wildfires.[2]

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.[3] It is named after the village of Frasnes-lez-Couvin in Belgium.[4]

Frasnian life

Fish

Cartilaginous fish

Cartilaginous fish of the Frasnian
Taxa Presence Location Description Images
Stethacanthus

Placoderms

Placoderms of the Frasnian
Taxa Presence Location Description Images
Bruntonichthys Gogo Reef Formation, Australia
Groenlandaspis
Camuropiscidae Gogo Reef Formation, Australia A family of mostly small, streamlined arthrodire placoderms.

Sarcopterygians

Actinistia
Actinistians of the Frasnian
Taxa Presence Location Description Images
Diplocercides Bergisch-Gladbach, Germany[] A basal actinistian
Miguashaia Escuminac Formation, Quebec A basal actinistian
Dipnomorpha
Dipnomorphans of the Frasnian
Taxa Presence Location Description Images
Gogodipterus Gogo Formation, Australia A lungfish in the extinct family Chirodipteridae.
Rhinodipterus Gogo Formation, Australia Might be the only known marine lungfish with air-breathing adaptations.[5]
Xeradipterus Gogo Formation, Australia A lungfish in the extinct family Holodontidae.
Tetrapodomorphs

References

  1. ^ http://www.stratigraphy.org/index.php/ics-chart-timescale
  2. ^ 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 2015.
  3. ^ Coen-Aubert, Marie; Boulvain, Frédéric (2006). "Frasnian". Geologica Belgica. 9 (1-2): 19-25. Retrieved 2013.
  4. ^ "Frasnian mudmounds from Belgium". University of Liège. Retrieved .
  5. ^ Clement, A. & Long, J.A. 2010. Air-breathing adaptation in a marine Devonian lungfish. Biology Letters 6: 509-512.

Coordinates: 43°30?12?N 3°05?12?E / 43.5032°N 3.0868°E / 43.5032; 3.0868



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Frasnian
 



 



 
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