The Permian period lasted from 299 million to 252 million years ago. During this time, the global climate rapidly warmed, ...

As the Carboniferous Period gave way to the Permian, environmental changes swept across ... Pulmonoscorpius, once a ruler of ...

In the remote reaches of Arizona s Petrified Forest National Park, scientists have unearthed North America's oldest known pterosaur a small, gull-sized flier that once soared above Triassic ecosystems ...

Scientists have unearthed in Arizona fossils from an assemblage of animals, including North America's oldest-known flying reptile, that reveal a time of transition when venerable lineages that were ...