situation held up the recognition of Alsace wines. A 1945 local ordinance designating the origin of Alsatian wines was used as the basis for the 1962 decree establishing the Alsace AOC. Neither the ordinance nor the decree contained a word about geographical designations or an allusion to crus. The situation began to evolve with a decree in 1975 which created the designation "Alsace Grand Cru". Its first article makes clear that wines have first to meet the Alsace AOC rules. Then, a decree in 1983 designated an additional 25 lieux-dits. In 1985, the INAO agreed to an increase in the Alsace Grands Crus list. The same year, a decree added 25 new names. In 1984, the Vendange Tardive and Sélection de Grains Nobles designations were introduced. In 1993, Rouffach was admitted in the Vorbourg lieu-dit. In 2001, the maximal yield was reduced. In 2005, exceptions to vine planting were allowed. The most recent additions were in 2007, bringing the total to 51 grand cru vineyards. Geography Alsace grands crus are produced in north-eastern France, in the region Alsace, on the territory of 47 communes (14 in Bas-Rhin and 33 in Haut-Rhin), from Marlenheim at northern end, westward from Strasbourg, to Thann at southern end, westward from Mulhouse. Geology and orography The Alsace plain occupies the south part of the Upper Rhine Plain, which formed from a collapse during the Oligocene and is followed since the Miocene by the river Rhine. The vineyard stays on the lower slopes of the Vosges Mountains, on the fault zone of the graben, covered by alluvial fans of the many rivers and creeks flowing from the nearby heights. This explains the variety of the subsurface materials and their succession forming a true mosaic: limestone, granite, shale, gneiss or sandstone. Mainly, the upper part of the slopes of the sub-Vosge hills consists of old rocks: pluton and metamorphic rocks like granite, gneiss or slate. Vine-planted parcels are rather steep and climb up to 478 m height (near Osenbach). The lower part of the slopes consists of layers of limestone or marl covered by loess where the slope is rather smooth. The plain consists of a thick layer of alluvium deposited by the Rhine (silt and gravel). This zone is more fertile than the others, with an important aquifer close to the surface (less than 5 m deep): the Upper Rhine aquifer. Such differences allow each Grand