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FOSSIL SAND DOLLARS
These lovelies are fossil sand dollars with their beautiful five-fold radial symmetry and petal-like pattern. they are echinoids, a group of echinoderms with flattened, rigid, globular skeletons made of thin calcium carbonate plates. Their ancestors diverged from an irregular order of echinoids called cassibuloids during the Jurassic. The first true genus of sand dollar, Togocyamus, arose