early La Tène culture (named for the type site at Lake Neuchatel) which arose out of the Hallstatt background from the 5th century BC. By the final centuries BC, the Swiss plateau and Ticino were settled by Continental Celtic speaking peoples (Gauls): the Helvetii and Vindelici inhabited the western and eastern part of the Swiss plateau, respectively, and the Lugano area by the Lepontii. The interior Alpine valleys of eastern Switzerland (Grisons) were inhabited by the non-Celtic Raetians. The distribution of La Tène culture burials in Switzerland indicates that the Swiss plateau between Lausanne and Winterthur was relatively densely populated. Settlement centres existed in the Aare valley between Thun and Bern, and between Lake Zurich and the Reuss. The Valais and the regions around Bellinzona and Lugano also seem to have been well-populated; however, those lay outside the Helvetian borders. Almost all the Celtic oppida were built in the vicinity of the larger rivers of the Swiss plateau. About a dozen oppida are known in Switzerland (some twenty including uncertain candidate sites), not all of which were occupied during the same time. For most of them, no contemporary name has survived; in cases where a pre-Roman name has been recorded, it is given in brackets. The largest were the one in Berne-Engehalbinsel (presumably Brenodurum, the name recorded on the Berne zinc tablet), on the Aare, and the one in Altenburg-Rheinau on the Rhine. Of intermediate size were those of Bois de Châtel, Avenches (abandoned with the foundation of Aventicum as the capital of the Roman province), Jensberg (near vicus Petinesca, Mont Vully, all within a day's march from the one in Berne, the Oppidum Zürich-Lindenhof at the Zürichsee–Limmat–Sihl triangled Lindenhof hill, and the Oppidum Uetliberg, overlooking the Sihl and Zürichseee lake shore. Smaller oppida were at Genève (Genava), Lausanne (Lousonna) on the shores of Lake Geneva, at Sermuz on the upper end of Lake Neuchatel, at Eppenberg and Windisch (Vindonissa) along the lower Aar, and at Mont Chaibeuf and Mont Terri in the Jura mountains, the territory of the Rauraci. A female who died in about 200 B.C found buried in a carved tree trunk during a construction project at the Kern school complex in March 2017 in Aussersihl. Archaeologists revealed that she was approximately 40 years old when she died and likely carried out little physical labor when she was alive. A sheepskin coat, a belt chain, a fancy