Scientists unearth rare assembly of ancient animals, 7 unknown
Scientists have unearthed a fossil assemblage dating back to 209 million years, revealing a rare group of ancient animals, including North America's oldest-known flying reptile. The fossils include at least 16 vertebrate species, seven of them previously unknown. The remains of the pterosaur, about the size of a small seagull, and the other creatures were discovered in the US' Arizona.