Assertion: baltic amber | /r/ObjectUse | used by human
Facets:
value: in the upper paleolithic period
type: TEMPORAL
Source sentences:
text: Baltic amber is the name given to a specific type of natural fossilized resin that was the focus of international long distance trade throughout Europe and Asia beginning at least 5,000 years ago: it was collected and used by humans first in the Upper Paleolithic period, perhaps as long ago as 20,000 years.