Black limestone from the Jurassic (160 million ago). Aldealpozo, Soria, Castilla y Leon, Spain.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: 160, aldealpozo, black, castilla, geology, horizontal, jurassic, leon, limestone, million, people, petrology, rock, sedimentary, soria, spain