The Earth: a ringed planet, much like Saturn, surrounded by a hula hoop of asteroids. The summit of Mount Everest: a tropical ...

Back when the Earth was crawling with trilobites and other strange shelled creatures ... This era of intense bombardment, known as the Ordovician impact spike, may have resulted from meteorites ...

Simple, single-celled algae would have made enough oxygen via photosynthesis to sustain trilobites, clamlike brachiopods ... All of that extra oxygen likely contributed to the Great Ordovician ...

Though unfinished, Salter's monograph has thirty excellent plates which make it an essential starting point for the study of British Devonian, Silurian and Ordovician trilobites. The monograph is also ...

A huge 75-foot-tall square boulder deep in Wyoming’s Bighorn Mountains has been baffling people since it was discovered.

The most famous of all were the alien-looking trilobites. Around 440 million years ago, the climate suddenly shifted, and the temperature of the ocean changed dramatically. Earth saw its first mass ...

A new study finds that a trilobite species with exceptionally well-preserved fossils from upstate New York has an additional set of legs underneath its head. The research suggests that having a ...