Prehistoric rock in Japan reveals clues to major ocean anoxic event

ScienceDaily
Dec 17, 2024, 2:10 pm143 pts
Researchers analyzed radioisotopes in layers of fossilized volcanic ash. Decay of uranium to lead within tiny crystals enabled scientists to precisely pinpoint dates for certain events. They determined this event occurred 119.5 million years ago -- coincident with evidence for massive volcanic eruptions -- and…

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