Fig. 14

Overview map of the Swiss Molasse Basin with its main structural features (reproduced from Schuppli, 1952). Red line: anticline, dark blue line: syncline, black line: fault, red cross: gas seep, red circle: light oil occurrence, red triangle: heavy oil or asphalt occurrence. Note the relatively high concentration of oil and asphalt findings along the southern edge of the Jura fold-and-thrust belt in western Switzerland, and the gas shows in the Subalpine Molasse along anticlines and fault traps at the southeastern end of Lake Zurich