Rock Sample (IMAGE)

University of Wisconsin-Madison

Rock Sample

Caption

Aaron Satkoski, a scientist in the UW-Madison Geoscience Department, holds a sample sawn from a 3.23-billion-year-old rock core sample found in South Africa. The bands show different types of sediment falling to the ocean floor and solidifying into rock. The sample provides the earliest known evidence for oxygenic photosynthesis.

Credit

David Tenenbaum/University of Wisconsin-Madison

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