Sea Urchins, or Echinoids, have lived in the seas since the Late Ordovician Period, about 450 million years ago, which is about 220 million years before dinosaurs appeared. The remains and traces of these animals were buried in sediment that later hardened into rock, preserving them as fossils. The living representatives of echinoids are the familiar sea-urchins that inhabit many shallow coastal waters of the world.
NOTE: The item photographed is similar to the one you will receive. These fossil sea urchins are polished, are approximately 1.25" in diameter, and weigh about an ounce. Country of origin: Madagascar.