Wessman seeks vinous validation for Issigeac and Conne-de-Labarde, which lie on a clearly defined limestone plateau and merit their own micro-appellation according to Vineyard Director Lise Sadirac, who is working hard to convince the INAO. The layered limestone plateau of D’Issigeac took 1.5 million years to form. Vines take a decade to root in the fissured rock, where soil is a mere 20cm deep. Bergerac has 13 appellations and no distinct identity. Fine wine would benefit from a perceptible point of difference and a dose of celebrity stardust.