Assertion: caldera | /r/CapableOf | lie atop a shield volcano
Facets:
value: in the southern marra mountains
type: LOCATION
Source sentences:
text: The caldera lies atop a shield volcano or ash cone in the southern Marra Mountains, which developed first as a pile of basaltic lava flows and later as layers of volcanic ash and tuff, including the eruptions that formed the caldera.