Experts make on-the-spot investigation over a dinosaur footprint cluster found in Xuyong county of Luzhou, Sichuan province on Monday, September 15, 2014. Scientists from Zigong Dinosaur Museum and China University of Geosciences confirmed that those footprints were from sauropod dinosaurs, theropod dinosaurs, and bird-footed dinosaurs that lived in the Cretaceous Period, about 100 million years ago. [Photo/ newssc.org]