Cenomanian-Turonian boundary event
Anoxic extinction event in the Cretaceous period / From Wikipedia, the free encyclopedia
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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][5] signified by a large positive carbon isotope excursion.[6][7][8] However, apart from the carbon cycle disturbance, there were also large disturbances in the ocean's nitrogen,[9] oxygen,[10] phosphorus,[11][12][13] sulphur,[14] and iron cycles.[15]
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] |