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The first appearance of skeletal metazoans in the late Ediacaran (∼550 million years ago; Ma) has been linked to the widespread development of oxygenated oceanic conditions, but a precise spatial and temporal reconstruction of their evolution has not been resolved. Here we consider the evolution of ocean chemistry from ∼550 to ∼541Ma across shelf-to-basin transects in the Zaris and Witputs Sub-Basins...
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