This ready-to-retail Orthoceras Egg Pack is perfect for introducing rocks and minerals to your range. The quality eye-catching merchandiser, with its vibrant graphics, is ideal for making the most of your retail space. Just open the box and start selling! The distinctive bullet-like shell of these nautiloids was once divided into gas-filled chambers, which kept the creatures buoyant in the water. They are now fossilised in black limestone and often found in clusters, washed together by the ancient sea currents.