Assertion: bluestone | /r/HasProperty | natural foundation
Facets:
value: under the shenandoah valley
type: LOCATION
value: throughout history
type: TEMPORAL
Source sentences:
text: So, it can be said that, throughout history, bluestone has been the natural foundation under the Shenandoah Valley.
text: Bluestone is a natural stone paver, mined directly in the United States.
text: Bluestone is a natural stone material with a very attractive fine grained texture.