Assertion: american mastodon | /r/HasProperty | extinct
Facets:
value: by the 1800s
type: TEMPORAL
value: for roughly 10,000 years
type: TEMPORAL
Source sentences:
text: By the 1800s, American mastodons—prehistoric relatives of the elephant—had been extinct for roughly 10,000 years.
text: By the 1800s, American mastodons—prehistoric relatives of the elephant—had been extinct for roughly 10,000 years.