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.
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.[7]
North American subdivisions of the Frasnian include
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.[8] It is named after the village of Frasnes-lez-Couvin in Belgium.[9]
Referencesedit
^Parry, S. F.; Noble, S. R.; Crowley, Q. G.; Wellman, C. H. (2011). "A high-precision U–Pb age constraint on the Rhynie Chert Konservat-Lagerstätte: time scale and other implications". Journal of the Geological Society. London: Geological Society. 168 (4): 863–872. doi:10.1144/0016-76492010-043.
^Kaufmann, B.; Trapp, E.; Mezger, K. (2004). "The numerical age of the Upper Frasnian (Upper Devonian) Kellwasser horizons: A new U-Pb zircon date from Steinbruch Schmidt(Kellerwald, Germany)". The Journal of Geology. 112 (4): 495–501. Bibcode:2004JG....112..495K. doi:10.1086/421077.
^Algeo, T. J. (1998). "Terrestrial-marine teleconnections in the Devonian: links between the evolution of land plants, weathering processes, and marine anoxic events". Philosophical Transactions of the Royal Society B: Biological Sciences. 353 (1365): 113–130. doi:10.1098/rstb.1998.0195.
^"Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
^Klapper, Gilbert; Feist, Raimund; House, Michael (June 1987). "Decision on the Boundary Stratotype for the Middle/Upper Devonian Series Boundary". Episodes. 10 (2): 97–101. doi:10.18814/epiiugs/1987/v10i2/004. Retrieved 19 December 2020.
^Klapper, G.; Feist, R.; Becker, R.; House, M. (December 1993). "Definition of the Frasnian/Famennian Stage boundary". 16 (4): 433–441. Retrieved 19 December 2020. {{cite journal}}: Cite journal requires |journal= (help)
^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. ISBN978-0-231-16057-5. Retrieved 21 April 2015.
^Coen-Aubert, Marie; Boulvain, Frédéric (2006). "Frasnian". Geologica Belgica. 9 (1–2): 19–25. Retrieved 10 March 2013.[permanent dead link]
^. University of Liège. Archived from the original on 2011-07-06. Retrieved 2011-02-25.
frasnian, faunal, stages, late, devonian, period, lasted, from, million, years, million, years, preceded, givetian, stage, followed, famennian, stage, preꞒ, npaleogeography, late, devonian, machronology, paleozoicsdevoniancmpřídolíearlymidlateemlochkovianpragi. 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 Frasnian382 7 1 6 372 2 1 6 Ma PreꞒ Ꞓ O S D C P T J K Pg NPaleogeography of the Late Devonian 380 MaChronology 420 415 410 405 400 395 390 385 380 375 370 365 360 PaleozoicSDevonianCMPridoliEarlyMidLateEMLochkovianPragianEmsianEifelianGivetianFrasnianFamennianTournai Rhynie chert 1 Hangenberg event Famennian glaciation Kellwasser event Late Devonian extinction 2 Widespread 3 shrubs amp trees Hunsruck faunaSubdivision of the Devonian according to the ICS as of 2021 4 Vertical axis scale millions of years ago EtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal ICS Time scale s usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the conodont Ancyrodella rotundilobaLower boundary GSSPCol du Puech de la Suque Montagne Noire France43 30 12 N 3 05 12 E 43 5032 N 3 0868 E 43 5032 3 0868Lower GSSP ratified1986 5 Upper boundary definitionFAD of the conodont Palmatolepis triangularis LAD of the conodonts Ancyrodella and Ozarkodina and the goniatites Gephuroceratidae and BeloceratidaeUpper boundary GSSPCoumiac quarry Montagne Noire France43 27 41 N 3 02 25 E 43 4613 N 3 0403 E 43 4613 3 0403Upper GSSP ratified1993 6 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 7 North American subdivisions of the Frasnian include West Falls Group Sonyea Group Genesee GroupName and definition editThe 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 8 It is named after the village of Frasnes lez Couvin in Belgium 9 References edit Parry S F Noble S R Crowley Q G Wellman C H 2011 A high precision U Pb age constraint on the Rhynie Chert Konservat Lagerstatte time scale and other implications Journal of the Geological Society London Geological Society 168 4 863 872 doi 10 1144 0016 76492010 043 Kaufmann B Trapp E Mezger K 2004 The numerical age of the Upper Frasnian Upper Devonian Kellwasser horizons A new U Pb zircon date from Steinbruch Schmidt Kellerwald Germany The Journal of Geology 112 4 495 501 Bibcode 2004JG 112 495K doi 10 1086 421077 Algeo T J 1998 Terrestrial marine teleconnections in the Devonian links between the evolution of land plants weathering processes and marine anoxic events Philosophical Transactions of the Royal Society B Biological Sciences 353 1365 113 130 doi 10 1098 rstb 1998 0195 Chart Time Scale www stratigraphy org International Commission on Stratigraphy Klapper Gilbert Feist Raimund House Michael June 1987 Decision on the Boundary Stratotype for the Middle Upper Devonian Series Boundary Episodes 10 2 97 101 doi 10 18814 epiiugs 1987 v10i2 004 Retrieved 19 December 2020 Klapper G Feist R Becker R House M December 1993 Definition of the Frasnian Famennian Stage boundary 16 4 433 441 Retrieved 19 December 2020 a href Template Cite journal html title Template Cite journal cite journal a Cite journal requires journal help 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 Coen Aubert Marie Boulvain Frederic 2006 Frasnian Geologica Belgica 9 1 2 19 25 Retrieved 10 March 2013 permanent dead link Frasnian mudmounds from Belgium University of Liege Archived from the original on 2011 07 06 Retrieved 2011 02 25 43 30 12 N 3 05 12 E 43 5032 N 3 0868 E 43 5032 3 0868 nbsp This geochronology article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Frasnian amp oldid 1203920243, wikipedia, wiki, book, books, library,
