Didier PERRUGOT (et coll.) L'habitat carolingien du Grand Longueron (Champlay, Yonne).Origine et mutation d'un grand domaine foncier au Haut Moyen Age (VIIe-IXe siècles) (Préface de P. Périn), 2008, 238 p., 120 p. 120 fig. (ISBN: 978-2-35518-003-3)

Le Grand Longueron, a hamlet in the district of Champlay (Yonne), is the site of a Carolingian settlement dating to the VIII-IXth centuries. This farm situated in the Yonne Valley was excavated from 1978 to 1981. The study of soil samples suggests a number of scientific contributions (dendrochronology, carpology, anthracology, osteology, study of water-swollen wood, C14 analysis, …). It also makes references to historical facts given by historical archives and underlines global warming at a local level in the years 800 - 900.