The famous Rosans sandstone balls: spheres formed by crystallization of quartz in secondary age sandstone (- 110 ma) - their size can reach more than a meter in diameter - We find these rare structures in the Spanish Basque Country ( jaizkibel) and on the Pacific coast (Oregon and California) - Saint Andre de Rosans region, Serre d'Autruy, Baronnies, Hautes Alpes, France
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