Assertion: cave's formation | /r/HasProperty | 4,000 feet
Facets:
value: together
type: MANNER
Source sentences:
text: Deposition resumed in the Cambrian period and continued through the Paleozoic era, creating nine major formations which together are 4,000 feet (1,200 m) thick (the only geologic period in the Paleozoic not represented is the Silurian).