Stock Photo - Employees of specialist company Volker Hellbeck retrieve the stone slab with the dinosaur tracks at a hiking path at the Ruhr in Bochum, Germany, 17 June 2013. The dinosaur tracks, which are over 300 million years old, are the oldest ever discovered in Germany. Photo: MARCUS SIMAITIS | usage worldwide. - Bochum/North Rhine-Westphalia/Germany

Stock Photo: Employees of specialist company Volker Hellbeck retrieve the stone slab with the dinosaur tracks at a hiking path at the Ruhr in Bochum, Germany, 17 June 2013.

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