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Standard sphere: Circumference 25cm
Most commonly formed in volcanic regions where lava flows have left gas bubbles in rock
Alectryonia would have lived in shallow coastal waters and been a filter feeder
Although sizes vary a little
An Orthoceras fossil (400 million years old)
Sand Dollar Sea Urchin (Pyguru) gold Standard sphere: Circumference 25cmCommonly known as sand dollars or pansy stones, these fossilised Pyguru sea urchins come from Madagascar. Famed for the distinctive star pattern on their polished face, these fossils are extremely tactile. From Sakaraha, Madagascar. Jurassic, circa 165 million years old. Price includes a small display stand. Size: Length 6. 5cm Width. 6. 5cm Depth 2cm. Measurements are approximate and the minimum size you should expect your item to be