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 recent shells retain the organic material that give the shells ... The process may be aragonite crystallizing to calcite, as in fossil snails, or it may be the growth of larger crystals of an ...

Though known as a fossil-bearing site ... press release that today’s checkerboard worm lizards eat snails by breaking open their shells. Now, researchers can make a prehistoric link.

All mollusks build their own shells, whether they live in water or on land. Creatures like snails, clams, oysters and mussels use an organ called a mantle to secrete layers of calcium carbonate ...

Fossils are an essential record of life on ... For example, in the Hawaiian Islands, sediment layers entomb native snail shells—and then the layers above show these snails being replaced by ...

Our special video series looks at some of the more unique shells at the Bailey-Matthews National Shell Museum on Sanibel, ...