At the end of 1991, in the framework of the archeological program covering the middle Oise valley, a survey of three structures, most probably SOM as confirmed by the discovery of a small ceramic element and of cremated human bones, revealed their sepulchral character. However the bone fragment layout suggests a different operating mode. Of oblong shape, these structures can be related to mass burials, and differ from their megalithic equivalents by an architecture based on wood instead of stone. A final feature : they were all three destroyed throughout by intense fire. Such examples are rare in the Paris basin. Similar fire-destroyed burials are found across the Rhine.