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Chert nodules in chalk

Chert nodules in chalk

C010/4533

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Credit

DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY

Caption

Chert nodules (black) in chalk, formed by concretionary enrichment of silica after the chalk has been deposited in marine environments. Cretaceous formation of the Avedat, Negev desert, Israel.

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