In a new study, Stanford researchers have strongly bolstered the theory that a lack of oxygen in Earth’s oceans contributed to a devastating die-off approximately 444 million years ago. The new results further indicate that these anoxic (little- to no-oxygen) conditions lasted over 3 million years – significantly longer than similar biodiversity-crushing spells in our planet’s history.
Laminated black shales and cherts exposed on the…

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Source: archeo