A concretion (about 40cm in diameter) formed in Eocene sandstone of the Coaledo formation when calcium and iron precipitated around an organic nucleus; Sunset Bay,Charleston,Oregon,USA | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Pollock, Robert & Jean |
Taille de l’image : | 5100 px × 3387 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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