Photo de stock - Desert varnish, desert patina or rock varnish is a coating found on rock surface on desert environments. The black color is due to manganese oxides. Petroglyphs (Newspaper Rock). This photo was taken in Canyonlands National Park, Utah, USA.

Photo de stock: Desert varnish, desert patina or rock varnish is a coating found on rock surface on desert environments. The black color is due to manganese oxides.

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