At the base of a bed of flysch sandstone of Eocene age in the Jaca area of the Aragon river valley (Spain), occur rosette type markings about fifty centimeters in diameter consisting of shallow grooves radiating from a central cone-shaped impression. They are believed to be marks left by large pelecypods.
Arree mountains, France, structural geology, central dome of Ordovician formations, lower Devonian epizonal schists and quartzites, post-Namurian (Carboniferous) faulting
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