Oxygen came late to ocean depths during Paleozoic
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O2 levels rose and fell at the ocean floor long after marine animals appeared and diversified a half billion years ago.
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What the geologic record reveals about how the oceans were oxygenated
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Chadlin Ostrander uses thallium isotopes to track the rise and fall of free oxygen on Earth 2.5 billion years ago, the process that enabled life as we know it.
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