Cenomanian-Turonian boundary event

System/
Period 		Series/
Epoch 		Stage/
Age 		Age (Ma)
Paleogene Paleocene Danian younger
Cretaceous Upper/
Late 		Maastrichtian 66.0 72.1
Campanian 72.1 83.6
Santonian 83.6 86.3
Coniacian 86.3 89.8
Turonian 89.8 93.9
Cenomanian 93.9 100.5
Lower/
Early 		Albian 100.5 ≈113.0
Aptian ≈113.0 ≈125.0
Barremian ≈125.0 ≈129.4
Hauterivian ≈129.4 ≈132.9
Valanginian ≈132.9 ≈139.8
Berriasian ≈139.8 ≈145.0
Jurassic Upper/
Late 		Tithonian older
Subdivision of the Cretaceous system
according to the ICS, as of 2017.[1]

The Cenomanian-Turonian boundary event, also known as the Cenomanian-Turonian extinction, Cenomanian-Turonian Oceanic Anoxic Event (OAE 2), and referred to also as the Bonarelli Event or Level,[2] was an anoxic extinction event in the Cretaceous period. The Cenomanian-Turonian oceanic anoxic event is considered to be the most recent truly global oceanic anoxic event in Earth's geologic history.[3] There was a large carbon cycle disturbance during this time period,[4] signified by a large positive carbon isotope excursion.[5][6][7] However, apart from the carbon cycle disturbance, there were also large disturbances in the ocean's nitrogen,[8] oxygen,[9] phosphorus,[10][11][12] sulphur,[13] and iron cycles.[14]

  1. ^ "International Chronostratigraphic Chart". www.stratigraphy.org.
  2. ^ Cetean, Claudia G.; Balc, Ramona; Kaminski, Michael A.; Filipescu, Sorin (August 2008). "Biostratigraphy of the Cenomanian-Turonian boundary in the Eastern Carpathians (Dâmboviţa Valley): preliminary observations". Studia Universitatis Babeş-Bolyai, Geologia. 53 (1): 11–23. doi:10.5038/1937-8602.53.1.2.
  3. ^ Cite error: The named reference PetrizzoEtAl2022 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference ArthurEtAl1988 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference GroshenyEtAl2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference JarvisEtAl2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference JarvisEtAl1988 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference JuniumAndArthur2007 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference OAE2Poland was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference EnhancedPhosphorusRecycling was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference EnhancedPhosphorusRecyclingApatiteAuthigenesis was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference PhosphorusCycleOscillation was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference renamed_from_9_on_20221219231054 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference OkhouchiEtAl1999 was invoked but never defined (see the help page).