The Chattian (also known as Chickasawhayan or Late Oligocene) is the second and final of two stages of the Oligocene Epoch. It spans the time between 28.4 ± 0.1 Ma and 23.03 ± 0.05 Ma (million years ago).

During the Chattian the largest known single-event volcanic eruption occurred: the Fish Canyon eruption of La Garita with a magnitude of 9.2.[1] It has been dated to 27.51 Ma ago.[2]

The Chattian stage spans the Mammal Paleogene zones 26 through 30 and part of 25. [3]

References Edit

  1. ^ Mason, Ben G.; Pyle, David M.; Oppenheimer, Clive (2004). "The size and frequency of the largest explosive eruptions on Earth". Bulletin of Volcanology 66 (8): 735–748. doi:10.1007/s00445-004-0355-9. 
  2. ^ Lanphere, Marvin A.; Baadsgaard, H. (2001). "Precise K–Ar, 40Ar/39Ar, Rb–Sr and U/Pb mineral ages from the 27.5 Ma Fish Canyon Tuff reference standard". Chemical Geology 175 (3–4): 653–671. doi:10.1016/S0009-2541(00)00291-6. 
  3. ^ Alroy, John. "Mammal Paleogene zones". The Paleobiology Database. Retrieved on 15 July 2009. 

External linksEdit

Paleogene period
Paleocene epoch
Eocene epoch
Oligocene epoch
Danian | Selandian
Ypresian | Lutetian
Bartonian | Priabonian
Rupelian | Chattian

Geological time spiral

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