Hundreds of millions of years ago, the first plants began spreading across Earth’s land. This major turning point helped ...

UC College of Arts and Sciences Professor Thomas Algeo has been studying the planet's five major mass extinctions since the Ordovician Period, when global sea levels were much higher than today. In a ...

5 mass extinctions wiped out 65–96% of species on Earth, with major events including the Ordovician, Devonian, Permian, Triassic, and Cretaceous periods. New developments in the search for Nancy ...

Ancient sea organisms survived until a sudden extinction 550 million years ago, revealing what may be the first major mass ...