(Bingyin September fourth day), October 7, 1986, the United States discovered the oldest dinosaur fossils. in Arizona, United States

1986, scientists discovered a number of well-preserved fossils of dinosaur skeletons. According to archaeologists determination, they have a history of 125 million years, is the oldest dinosaur fossils in the world found so far. Experts believe that, this discovery of the dinosaur, new dinosaur species still do not know on a scientific.