At first, the day looks like a classic fossil beach hunt: rough waves, shell layers, cliff falls, and the hope of finding a shark tooth. Then a small fragment changes everything. They identify it as ...

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 ...