Geological Map of the Federal Republic of Germany 1:200,000 (GÜK200) — CC 8718 Konstanz

Blatt Konstanz shows the subalpine Molasse basin with Lake Constance in the central part. The Molasse sediments are bounded in the northwest by the Jura of the Swabian Alb and in the southeast by alpine units. In addition to Helvetikum and Flysch Zones, parts of the Northern Limestone Alps (Lechtal and Allgäu Ceiling) are recorded in the far southeast. The alpine foreland with unfolded and folded Molasse occupies the largest area in the map section. The rubble of the Alps is filled with tertiary sediments. In the area of the unfolded foreland molasses, tertiary basin filling (freshwater, brackish water and sea molasses) is extensively superimposed by pleistocene top layers (deposits of the mindel, crack and worm cold season). While the tertiary molasses in the northwest are gradually creeping out, they were bended in the southeast at the deformation (wrinkle molasses). In the foothills of the Swabian Alb, in the northwest corner of the map, limestones and marlstones of the Jurassic are open. In the transition area to the Molasse Basin, the tertiary volcanoites of the Hegau (Phonolites, Olivinnephelinite, Ceilinguff) are also recorded. The alpine units occupy only a very small part in the southeast of the map sheet. Helvetic Zone and Flysch Zone are relatively broad. In the Helvetikum, consisting of limestone and marl stones of the Jurassic and the chalk, several shed and ceiling units can be distinguished: Helvetic border zone, Flammenegg train, Hohenemser Falte, Säntis ceiling, Liebensteiner blanket as well as shed zone of Wildhaus-Brülisau. In the Flysch zone, Cretaceous deep water sediments are stored in typical alternating storage of clay-mergel or sandy-calcareous facies. In the far southeast are Lechtal and Allgäu ceilings of the Limestone Alps (lime and dolomite rocks of the Triassic and Jurassic). In addition to the legend, which informs about the age, genesis and petrography of the represented units, a geological profile provides additional insights into the structure of the subsurface. The northwest-south-east section crosses the Alpine foreland with unfolded and folded Molasses, the Helvetikum and Flysch zones of the Alpine edge and ends in the Northern Limestone Alps (Lechtal and Allgäu-Decke).