Canfield ocean

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What Wikipedia says

The Canfield Ocean model was proposed by geochemist Donald Canfield to explain the composition of the ocean in the middle to late Proterozoic.

Excerpt from the Wikipedia article “Canfield ocean”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hgossy, CC BY-SA 4.0, via Wikimedia Commons.