Assertion: american mastodon | /r/CapableOf | become extinct
Facets:
value: at the end of the pleistocene
type: TEMPORAL
Source sentences:
text: It became extinct at the end of the Pleistocene approximately 11,000 years ago.
text: It became extinct at the end of the Pleistocene approximately 11,000 years ago.
text: The American mastodon () lived in North America beginning almost four million years ago, becoming extinct approximately 10,000 years ago.