This is a fossilized sand dollar, or Clypeasterioda species, from the D'Angers Region in France. It dates back to the Miocene age, or around 23 million years ago. A large, well-preserved sand dollar sits on a bed of limestone matrix with other, broken sand dollar pieces embedded around it. The fossil has fantastic detail, with well-defined 'petals', or ambulacra, on the surface.
This fossil is approximately 12.4 cm x 11.6cm x 3.9 cm, with the dollar sitting at 7.1 cm across.
