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Sea Urchin Fossil

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DSC_7634a.JPG BasaltThumbnailsBiblioteca Malatestiana, CesenaBasaltThumbnailsBiblioteca Malatestiana, CesenaBasaltThumbnailsBiblioteca Malatestiana, CesenaBasaltThumbnailsBiblioteca Malatestiana, Cesena

Archaecidaris, Carboniferous, Brown County, USA