Hervé G. auteur aut IRD Marmara M. auteur aut IRD Chauvin Anne auteur aut IRD Vaschalde C. auteur aut IRD Martin-Kobierzyki E. auteur aut IRD Brossier B. auteur aut IRD Demory F. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Alignments of heating stones hearths are common in Southeast France and in Switzerland at the Late Bronze and Early Iron Ages. Because of the plateau effect on the radiocarbon calibration curve, the hypothesis that the structures were in use almost synchronously within an alignment is still debated. For archaeomagnetic dating purposes, we studied eight heating stones hearths, six of them organized in two parallel alignments, from the site Clos de Roques - Route de Barjols in Saint-Maximin-la-Sainte-Baume in Southern France. Archaeodirections were determined after thermal and alternating field demagnetizations and archaeointensities using the ThellierThellier protocol with corrections for the anisotropy and cooling rate effects. The large difference between average archaeodirections (more than 20 degrees in declination) clearly demonstrate that the last use of the structures was not contemporaneous, bearing in mind that no archaeological evidence of multiple uses was found. The archaeomagnetic dates were obtained with the local prediction of declination, inclination and intensity by the European geomagnetic model SCHA.DIF.4k. They range between the end of the 8th century BCE and the end of the 5th century BCE with a similar to 150 years precision at 95 % of confidence for most structures. These results confirm the occupation of the site at the Early Iron Age given by other dating methods but imply a longer use than the one around 625-575 BCE suggested by the typochronology of ceramic artefacts. The different archaeomagnetic dates obtained within the alignments show that the alignments of hearths were not established over a short period as previously thought but over a couple centuries, highlighting the important and still poorly understood role of these fired structures in the area. specialized Archaeomagnetic dating Heating stones hearths Secular variation of the geomagnetic field Early Iron Age Western Europe FRANCE 112 066 66 105241 [13 p.] 2025 2352-409X https://www.documentation.ird.fr/hor/fdi:010094228 10.1016/j.jasrep.2025.105241 2352-409X [F B010094228] https://www.documentation.ird.fr/hor/fdi:010094228 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2025-07/010094228.pdf IRD - Base Horizon / Pleins textes 2025-07-15 2025-11-04 fdi:010094228 fre