Assertion: seamount's eruption | /r/CapableOf | end before the eruption of mount mazama
Facets:
value: at 7.7 ka
type: TEMPORAL
Source sentences:
text: Eruptions of the chain began during or closely following the retreat of late Pleistocene glaciers (after about 18 ka ) and ended before the eruption of Mount Mazama (Crater Lake at 7.7 ka), with the main pulse of activity lasting perhaps only 3,000 years.