Undersea Volcanic Eruptions Linked to Ancient Die Off

Publication: National Geographic News   Date: July 16, 2008   View Article

A surge of undersea volcanic activity about 93 million years ago sapped the oceans of oxygen, triggering a mass extinction of marine life, a new study finds.

The catastrophic event buried a thick mat of organic matter—from large clams to single-celled algae—on the seafloor, which today is a major source of oil.

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