Stock Photo - 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 are from the Fremont indians. This photo was taken in Utah, USA.

Stock Photo: 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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