When did these blockhead dinosaurs get their domes? A new fossil is “the specimen we have all been waiting for.” In this artist's reconstruction, two pachycephalosaurs from the new species Zavacephale ...

For decades, a few hundred miles northeast of Beijing, the Yixian Formation has offered up a treasure trove of exquisite dinosaur fossils dating back to the early Cretaceous (about 145 to 66 million ...