How a Sea Creature’s Fossils Show All the Colors of the Rainbow

How a Sea Creature’s Fossils Show All the Colors of the Rainbow: The brilliant iridescent hues found in ammolite come from tiny air gaps in the fossils’ layers, a new study finds. By Alexa Robles-Gil Millions of years ago, squid-like creatures called ammonites swam through ancient seas. While the animals are long gone, many of their shells fossilized, and some of them formed a rare, prized