Oxygen came late to ocean depths during Paleozoic, isotope analysis reveals

PHYSorg
Sep 4, 2025, 12:27 pm98 pts
The explosion of animal life in Earth's oceans half a billion years ago during and after the Cambrian Period is commonly attributed to a substantial and sustained rise of free oxygen (O2) in seawater. Some researchers even argue for near-modern levels of ocean oxygenation at this time.

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