Taghanic event

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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
Late Devonian
period

The Taghanic event (Taghanic unconformity, Taghanic crisis or Taghanic onlap) was an

Kellwasser event (372 ma) and the Hangenberg event (359 ma).[6][5][7]

Extinctions

The Taghanic event at the Givetian/Frasnian boundary caused many extinctions, including the disappearance of about 50% of

Trilobites, and Rugosa were reduced.[8]
Thamnopora boloniensis, a tabulate coral, became extinct.[9]

Sediments

palaeobiogeographic events.[6] The Taghanic event is found in the Tully Formation and Marcellus Formation in New York and Pennsylvania, including the Windom shale there. The Mahantango Formation in Pennsylvania, West Virginia, and Maryland also record the Taghanic event. The Taghanic event has been found in Tafilalt, Morocco in the eastern Anti-Atlas mountain range. The Orcadian Basin in Scotland has exposed rocks from the Taghanic event.[10]

Taghanic onlap

The period of global warming that caused the Taghanic event melted

seafloor. The flooding of what is now the southwestern United States created a shallow marine environment.[3][11][12]

Marine extinction intensity during Phanerozoic
%
Millions of years ago
CambrianOrdovicianSilurianDevonianCarboniferousPermianTriassicJurassicCretaceousPaleogeneNeogene
The Taghanic event was just before the Late Devonian (Late D) event. The chart gives a comparison of the extinction event to other mass extinction events in Earth's history. Plotted is the extinction intensity, calculated from marine genera.
  • Marcellus Formation Shale from Middle Devonian sedimentary rock, location of the Taghanic event rocks
    Marcellus Formation Shale from Middle Devonian sedimentary rock, location of the Taghanic event rocks
  • Windom shale, location of Taghanic event rocks
    Windom shale, location of Taghanic event rocks
  • Tully Formation at Taughannock Falls State Park, location of the Taghanic event rocks
    Tully Formation at Taughannock Falls State Park, location of the Taghanic event rocks

See also

References