Fossil shell of Pithocerithium rubiginosum (height is 1.5 cm) from the Miocene sediments of Nexing in Austria (left) and isolated reddish polyene pigments on calcium fluoride disc (diameter of ...

The fossil snail is 26.5 millimeters long, 21 millimeters wide, and 9 millimeters tall. The shell's outer margin is lined with short hairs that are bunched around the shell opening. Its name ...

Remember, "skeletons" include bone, the protein shell of crabs or insects ... The ammonoid (the round, snail-ish fossil) has been replaced by pyrite. Pyrite formation requires an absence of oxygen (or ...