The Unearthing of a giant petrified leg in a coal mine dates this human leg to the Carboniferous layer. The petrification itself would indicate that the person was very, very ancient. This challenges the idea of how long man has been on earth, and brings into question the dating methodology as a whole. It is too bad this type of out-of-place instance always gets covered up, as it doesnt fit the prevailing models.
1. The Hawaiian Star. (Honolulu [Oahu[), 02 Oct. 1908. Chronicling America: Historic American Newspapers. Lib. of Congress