ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
An exposed formation of sandstone containing ochre with a pine tree in the forground. Ochre is a term used to describe sedimentary limonitic rocks which contain large amounts of hydrated iron oxide and hydroxide minerals. Ochre has had an historical importance as the source of a rich pigment ('Yellow Ochre'). Photographed in the Rousillon region of France.
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