French archaeologist and writer who was the first to develop the idea that prehistory could be measured on the basis of periods of geological time. In 1837, in the Somme Valley, he discovered flint hand axes and other stone tools along with the bones of extinct mammals in deposits of the Pleistocene Epoch (or Ice Age, ending about 10,000 years ago). Boucher de Perthes was the first to draw attention to the Stone Age's revolutionary significance, because at the time, 4004 BC was still believed to be the year of the creation. His claims that these objects were the tools of ancient man and that they occurred in association with the bones of extinct animals were ridiculed. In 1859, Boucher de Perthes's conclusions were finally upheld by a group of eminent British scientists, including Charles Lyell, Hugh Falconer, John Preswich, and John Evans, who visited the excavated sites. His archaeological writings include "De la Création: essai sur l'origine et la progression des êtres" (1838-41) and "Antiquités Celtiques et Antédiluviennes" (1847-64).