(1) Authentic Fossilized Sand Dollar (also known as fossil sea urchins) from Madagascar. These pieces have their face polished to show the fine detail of these fossils. The back of the fossils have not been polished. Each fossil will measure approximately 2-3 inches in diameter. These sand dollars were alive during the Jurassic Period, which means they are about 145-201 million years old! Please note these are completely authentic and natural specimens. Each fossil will be slightly different in shape, size, color, and overall appearance.