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 ...

These items included two 56-million-year-old jaw bones from an ancient horse and an early ancestor of modern primates, as well as the fossilized shell of a predatory moon snail that was alive just ...

with a dazzling array of beauty and global biodiversity, and will include special focuses on Southwest Florida shells, world-record-sized shells, deep-sea species, land snails, and ancient fossils.

Here's the story of how a fossil is made. This is an ammonite. Ammonites were once sea creatures with squid-like tentacles and a curly shell like a snail. They lived at the same time as dinosaurs.