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Sentence
Span Details
白亜紀
Cretaceous periodnoun
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
何度か
several times; a few times; once or twiceadverb
海洋無酸素事変
Oceanic Anoxic Event; OAEnoun
が
subject markergrammar
発生
occurrence; outbreak; emergence; generation; production; development; growth; ontogenynoun, suru verb
した。
light/support verb with a noun or noun-like phrase-> するgrammar