The Jura Mountains and the Saône Basin
摘要
Two very different regions are linked together in this chapter because their origins are linked: the Jura mountain chain, and to its west the Saône graben. The Jura Mountains are clearly “Alpine”, but are much less spectacular than the Alps themselves. They are dominated by a series of N-S ridges of Jurassic limestones within which Karst features are spectacular. Within this area is evidence of the successive ice margins of the last glacial receding limits. Beyond the thrust-westward margins of the Jura is the near-flat floor of the Saône graben. Of interest in the southeast is a distinct morainic zone, dating from the penultimate glaciation, the Dombes. The graben is bounded to its west by faulted Jurassic terrain, the classic Burgundy wine district. To the south is another important wine district, Beaujolais, developed on Massif Central granites, faulted against the limestone margins of the southernmost outer Paris basin the Saône graben.