Assertion: memorial's wall | /r/HasProperty | built with bluestone gneiss rubble
Facets:
value: during the first phase of construction
type: TEMPORAL
Source sentences:
text: During the first phase of construction (1848–1854), the walls were built with bluestone gneiss rubble, ranging from very large irregular stones having a cross section of about 5 by 10 feet (1.5 m × 3.0 m) down to spalls (broken pieces of stone) all embedded in a large amount of mortar.