Taghanic event

Taghanic event
386 million years ago
in Middle Devonian period
387.7 ± 0.8 – 382.7 ± 1.6 Ma
↓
Chronology
Preceded byTaghanic event
386 million years ago
in Early Devonian period
Followed byTaghanic event
386 million years ago
in Late Devonian period

The Taghanic event (Taghanic unconformity, Taghanic crisis or Taghanic onlap) was an extinction event that occurred about 386 million years ago during the Givetian faunal stage of the Middle Devonian geologic period in the Paleozoic era.[1] It was caused by hypoxia from an anoxic event. The event had a period in which dissolved oxygen in the Earth's oceans was depleted. The Taghanic event caused a very high death rate of corals. The loss of the coral reefs caused a high loss of animals that lived in and around the reefs. The extinction rate has been placed between 28.5 and 36%, making the event the 8th largest extinction event recorded.[2][3][4] The reduced oxygen levels resulted from a period of global warming caused by Milankovitch cycles. In the Taghanic event sea levels were higher.[5] After the Taghanic Event, sea life recovered in the Frasnian faunal stage starting 382.7 million years ago. Two other events near this period were the Kellwasser event (372 ma) and the Hangenberg event (359 ma).[6][5][7]

  1. ^ Marshall, John E. A.; Brown, John F.; Astin, Timothy R. (April 15, 2011). "Recognising the Taghanic Crisis in the Devonian terrestrial environment and its implications for understanding land–sea interactions". Palaeogeography, Palaeoclimatology, Palaeoecology. 304 (1): 165–183. Bibcode:2011PPP...304..165M. doi:10.1016/j.palaeo.2010.10.016 – via ScienceDirect.
  2. ^ Sepkoski, J. John (December 18, 1996). Walliser, Otto H. (ed.). Global Events and Event Stratigraphy in the Phanerozoic: Results of the International Interdisciplinary Cooperation in the IGCP-Project 216 "Global Biological Events in Earth History". Springer. pp. 35–51. doi:10.1007/978-3-642-79634-0_4 – via Springer Link.
  3. ^ Johnson, J. G. (1970). "Taghanic Onlap and the End of North American Devonian Provinciality". Geological Society of America Bulletin. 81 (7): 2077. Bibcode:1970GSAB...81.2077J. doi:10.1130/0016-7606(1970)81[2077:TOATEO]2.0.CO;2.
  4. ^ Feist, R.; Klapper, G. (2021). "Phacopid trilobites in post-Taghanic Givetian through Frasnian cephalopod limestones, Montagne Noire (France) and related areas (Thuringia, Morocco)". Bulletin of Geosciences. 97 (1): 1–32. doi:10.3140/bull.geosci.1834. S2CID 246358282.
  5. ^ a b "Abstract: THE TAGHANIC EVENT: A LATE MID DEVONIAN ARIDITY CRISIS (2003 Seattle Annual Meeting (November 2–5, 2003))". gsa.confex.com.
  6. ^ "Late Devonian - an overview | ScienceDirect Topics". www.sciencedirect.com.
  7. ^ McGhee Jr GR, Clapham ME, Sheehan PM, Bottjer DJ, Droser ML (January 2013). "A new ecological-severity ranking of major Phanerozoic biodiversity crises". Palaeogeography, Palaeoclimatology, Palaeoecology. 370: 260–270. Bibcode:2013PPP...370..260M. doi:10.1016/j.palaeo.2012.12.019. ISSN 0031-0182.