Assertion: cave | /r/HasProperty | designated a national natural landmark
Facets:
value: by the national park service
type: OTHER
value: in 1988
type: TEMPORAL
value: in 1984
type: TEMPORAL
value: in 1987
type: TEMPORAL
Source sentences:
text: In 1987, the cave was designated a National Natural Landmark by the United States Department of the Interior and the National Park Service.
text: The cave was designated as a National Natural Landmark in 1984.
text: In 1988, Cave of the Mounds was designated a National Natural Landmark by the United States Department of the Interior and the National Park Service.