Sentences with phrase «exact age of these fossils»

However, because of the nature of the chamber sediments and the lack of other animal remains at the site, the researchers have not yet been able to nail down the exact age of these fossils, without which «there's no way we can judge the evolutionary significance of this find,» Rick Potts, director of the human origins program at the Smithsonian Institution's Natural History Museum, who was not involved in the discovery, told the Associated Press.