Fontainebleau, France
Oligocene, 30-40 Million Years Ago

17 3/8 x 18 3/4 x 7 in. (44.1 x 47.6 x 17.8 cm)

A particularly well-preserved example of a sandstone concretion is on display at the Smithsonian Institution National Museum of Natural History in Washington D.C.

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