Fossilized Mollusk or Sand DollarAlone or displayed in a group these polished fossilized mollusks and sand dollars are truly beautiful. These polished fossils from the Tulear Province in Madagascar have been polished to bring out surface detail and they date back to the Middle Jurassic period, or approximately 160 million years ago. They are between 2 and 3" across, most being in the middle of that size range. The photos are representative of what they look like, but being natural