The three volumes of Antiquités celtiques et antédiluviennes, by Jacques Boucher de Perthes, were published between 1847 and 1864. They were updated to reflect later discoveries and are among the founding works on prehistory. In them, the author, in the face of fierce opposition, presented his theory that “antediluvian man” had existed alongside large mammals, and in 1842, the discovery of a mammoth’s jaw in the same stratigraphic layer as a flint tool enabled him to prove man’s contemporaneity with extinct animal species.