The Chinese team claims the fossils dated to 155 million years ago (mya), whereas the Solnhofen limestone where "Archaeopteyx" was found is 144 mya in age. The new fossil "Xiaotingia" cannot be dated so accurately, as they were originally been purchased from a dealer. Prof Xu first saw the specimen at the Shandong Tianyu Museum. The other question to be asked of all early dinobirds is: could they fly? 