Assertion: holocene extinction | /r/HasProperty | sixth mass extinction event
Facets:
value: possibly
type: DEGREE
Source sentences:
text: The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinction event, after the Ordovician–Silurian extinction events, the Late Devonian extinction, the Permian–Triassic extinction event, the Triassic–Jurassic extinction event, and the Cretaceous–Paleogene extinction event.