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. | ||||
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, 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. There was a large carbon cycle disturbance during this time period, signified by a large positive carbon isotope excursion. However, apart from the carbon cycle disturbance, there were also large disturbances in the ocean's nitrogen, oxygen, phosphorus, sulphur, and iron cycles.