Assertion: amber | /r/CapableOf | find dates
Facets:
value: back to the carboniferous period
type: TEMPORAL
Source sentences:
text: The oldest amber found dates back to the Carboniferous Period about 320 million years ago.
text: Most Amber is 30 to 90 million years old, though some is slightly less than a million, and the oldest Amber found to date is 320 million years old.