For more than a century, fossils meant bones, shells and the occasional imprint of a leaf. Now, a wave of research is showing that the most revealing relics of ancient organisms are not their shapes ...

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 ...