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A few of several hundred sandstone balls on the plateau or escar

A few of several hundred sandstone balls on the plateau or escar

A few of several hundred sandstone balls on the plateau or escar
A few of several hundred sandstone balls on the plateau or escarpment face of a small hill called Serre d'Autruy. They are perfectly spherical or ovoid with diameters of at least 50 cm, the larger ones approaching two metres. The hill was under seawater in the Lower Cretaceous 110 million years ago, composed of fine muds and silts that were covered by a submarine avalanche of coarser sand. The sandstone balls resulted from lithification of the sand avalanche.

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A few of several hundred sandstone balls on the plateau or escar

A few of several hundred sandstone balls on the plateau or escarpment face of a small hill called Serre d'Autruy. They are perfectly spherical or ovoid with diameters of at least 50 cm, the larger ones approaching two metres. The hill was under seawater in the Lower Cretaceous 110 million years ago, composed of fine muds and silts that were covered by a submarine avalanche of coarser sand. The sandstone balls resulted from lithification of the sand avalanche. Saint Andre de Rosans, Massif des Baronnies, Hautes Alpes, France

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Media ID 15360523

Crystallisation , Diagenetic Concretion , Formations , Geological , Geology , Rock , Sedimentary , Stone Balls , Western Alps

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> Biosphoto Collection
> Images Dated > 2016 > September > 22 Sep 2016

BIOS PHOTO/AUSCAPE

Jean-Philippe Delobelle-BIOS PHOTO