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 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 Group
^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. 168 (4). London: Geological Society: 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. ISBN 978-0-231-16057-5. Retrieved 21 April 2015.
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...
also known as the Frasnian-Famennian extinction, which occurred around 372 million years ago, at the boundary between the Frasnian stage and the Famennian...
but rather is a series of pulsed extinctions at the Givetian-Frasnian boundary, the Frasnian-Famennian boundary, and the Devonian-Carboniferous boundary...
van Viersen; Willy Vanherle (2018). "The rise and fall of Late Devonian (Frasnian) trilobites from Belgium: taxonomy, biostratigraphy and events". Geologica...
occurred within the Frasnian age of the Devonian at about 377-378 Ma, a moment in time that was about 5.9 Ma prior to the Frasnian/Famennian extinction...
(24–28 in) in length. D. terrelli's fossil remains are found in Upper Frasnian to Upper Famennian Late Devonian strata of the United States (Huron, Chagrin...
had some recent detractors. Fossils of the group go back to the Middle Frasnian stage of the Late Devonian period. [citation needed] These organisms have...
the cladogram below: The type genus, Dunkleosteus, is known from Late Frasnian and Famennian-aged marine strata from Europe, Morocco, and North America...
extinction was the Kellwasser Event (Frasnian-Famennian, or F-F, 372 Ma), an extinction event at the end of the Frasnian, about midway through the Late Devonian...
tetrapods. All known forms of Frasnian tetrapods became extinct in the Late Devonian extinction, also known as the end-Frasnian extinction. This marked the...
Globoharpes is a genus of harpetid trilobite known from the late Frasnian of Western Australia. G. tiecherti G. freindi McNamara, Kenneth; Feist, Raimund;...
levels were higher. After the Taghanic Event, sea life recovered in the Frasnian faunal stage starting 382.7 million years ago. Two other events near this...
2 million years ago to 358.9 million years ago. It was preceded by the Frasnian stage and followed by the Tournaisian stage. In the seas, a novel major...
from Dunkleosteoidea in doubt, as shown in the cladogram below: From the Frasnian Gogo Formation of northwestern Western Australia. This is the best known...
years after the Late Devonian mass extinction (Kellwasser event) at the Frasnian-Famennian boundary. The event is named after the Hangenberg Shale, which...
with Globoharpes it is one of the only harpetids that are found from the Frasnian stage of the Devonian period. It most likely evolved from Lioharpes. All...
Amphipora managed to become widespread and abundant reef-builders during the Frasnian stage of the Late Devonian. The order contains a single family, Amphiporaidae...
survive into the Late Devonian before going extinct at the end of the Frasnian (Late Devonian). Baarli, B. Gudveig; Huang, Bing; Maroja, Luna S. (2022)...
models and electronic devices Filtration fraction, in renal physiology Frasnian-Famennian extinction (F-F), also known as the Late Devonian extinction...
the last phase of the Devonian period, the Famennian faunal stage, (the Frasnian-Famennian boundary), about 372.2 Ma. Many fossil agnathan fish, save for...
a cause of the first Devonian extinction, the Kellwasser Event or Late Frasnian extinction, due to it being believed by some researchers to coincide around...
internationally recognized were defined from rock sites located in Wallonia: e.g., Frasnian (Frasnes-lez-Couvin), Famennian (Famenne), Tournaisian (Tournai), Visean...
Images Harajicadectes Gen. et sp. nov Valid Choo et al. Devonian (Givetian–Frasnian) Parke Siltstone Australia A basal member of Tetrapodomorpha. The type...
and the genus also includes Magreanops monachus, both described from the Frasnian-aged Bovesse Formation. and Moulin Liénaux Formations in Belgium during...
described from isolated cladodont teeth found in deposits from the upper Frasnian to lower Fammenian of central Iran. The specific epithet is derived from...
environments, first appearing during the Ordovician, and perishing during the Frasnian–Famennian extinction event of the Late Devonian. They occupied a large...
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