Peel River (IMAGE)

University of Utah

Peel River

Caption

Ancient marine shales deposited 400 million years are exposed in cliffs cut by the Peel River in Canada’s Yukon. Isotope analysis on the thallium contained in these deposits helped reconstruct deep-ocean oxygen levels 485 to 380 million years ago.

Credit

Erik Sperling, Stanford University

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Editorial use only. Creator must be credited.

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