About half a billion years ago, a volcanic eruption near a shallow sea in what’s now Morocco preserved some of the most complete specimens ever found of buglike sea creatures called trilobites, ...

Imagine this: It’s 1984, and two amateur paleontologists are digging in a quarry near Waukesha when they discover what ultimately turns out to be about 2,000 invertebrate fossils — things like ...

Artistic reconstruction of two species of trilobite an instant before burial in a flow of volcanic ash 510 million years ago. Researchers have described some of the best-preserved three-dimensional ...

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