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Swabian Jura

Mountain range in Baden-Württemberg, Germany

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Through Solubility, Smallholding and Fossil

The Swabian Jura occupies the region bounded by the Danube in the southeast and the upper Neckar in the northwest. In the southwest it rises to the higher mountains of the Black Forest. The highest mountain in the region is the Lemberg (1,015 m (3,330 ft)). The area's profile resembles a high plateau, which slowly falls away to the southeast. The northwestern edge is a steep escarpment (called the Albtrauf or Albanstieg, rising up 400 m (1,300 ft), covered with forests), while the top is flat or gently rolling.

In economic and cultural terms, the Swabian Jura includes regions just around the mountain range. It is a popular recreation area. The whole Schwäbische Alb area is a UNESCO global geopark covering 6,688 km2 (2582 sq mi.); it was designated as a National Geopark in Germany in 2002 and became a member of the European Geoparks Network in 2004; in 2015 it was included in the newly established scheme of UNESCO Global Geoparks. In its central area it comprises a Swabian Alb Biosphere Reserve of 852.69 km2 (330 sq. mi.).

Geology

The geology of the Swabian Jura is mostly limestone, which formed the seabed during the Jurassic period. The sea receded 50 million years ago. Three layers of different limestones are stacked over each other to form the range: Black Jurassic, Brown Jurassic, and White Jurassic (the youngest of the three). White Jurassic may be as pure as 99% calcium carbonate. Since limestone is soluble in water, rain seeps through cracks everywhere, forming a karst landscape, featuring subterranean rivers which flow through a large system of caves before they emerge. As a result there are hardly any rivers, lakes or other forms of surface water on the plateau.

In some places, former volcanic activity has left traces, such as maars and hills. In the west, the Zollerngraben (a geological depression in a tectonically active region) sometimes causes mild earthquakes. The Nördlinger Ries is a large meteorite crater (15 million years old).

Tertiary relicts can be found in the southern part of Swabian Jura. Famous locations are known in the Ulm area (e.g., Turritellenplatte of Ermingen).

Constant rain and other weather influences are slowly dissolving the entire range. Each year, it recedes approximately 2 mm (0.08 in). Some millions of years ago, the mountains reached as far as Stuttgart. In some places, the limestone was more resistant to decay and thus the recession of the main range has left small mountains (called "Zeugenberge"—"witness mountains" or outliers; e.g. the Achalm or the Hohenstaufen) which testify to the former territory of the range. The omnipresent caves are great tourist spots, beautiful and not very crowded. Many different types can be found, from dry dripstone caves to caves that can only be entered by boat. Sometimes the discharge of the water from subterranean rivers can be spectacular, too, e.g. the Blautopf, a source for a tributary of the Danube. Also because of the porous limestone, the Danube nearly disappears near Immendingen (in 1911, 1921, 1928 and 1943 it disappeared completely), only to reappear several kilometers further down. Most of the water lost by the Danube resurfaces in the Aachtopf, a spring for a tributary to the Rhine.

The soil is not very fertile, the humus is often as thin as 10 cm (4 in). Many small limestone pebbles are found on the surface.

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