Datations d'apports de tuiles et briques sur des sites gallo-romains à l'aide de mesures archéomagnétiques opérées sur d'abondants échantillonnages

Abstract

To exploit fragments of tiles and bricks, collected during systematic surface prospections, in vue of refined datages of gallo-roman sites, measures of the dip of thermoremanent magnetization have been made on large samplings from excavations (FREHEL, 500 fragments, LAVRET, 300 fragments). To each piece is associated a reference trihedral bound with the edges ; a core-sample, apt to go in a spinner, is cut. After determination of the side on which the element lay while it was baked, a histogram of the dips can first be built. Then, to better distinguish the deliveries, the deviation, that is the angle between the magnetic north and an horizontal edge of the element - a variable characteristic of the in-filling of the kiln, combined with the dip, makes clusters appear. For the dating, the associated finds help to remove indéterminations resulting from the sole use of the dips.