Ilm-Saale- and Ohrdrufer plate

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Ilm-Saale- and Ohrdrufer plate
Highest peak Neck cap ( 605.4  m above sea  level )
location Thuringia
Edge plate of the Thuringian basin (with edge plates)
Classification according to Handbook of the natural spatial structure of Germany
Ilm-Saale- and Ohrdrufer Platte (Thuringia)
Ilm-Saale- and Ohrdrufer plate
Coordinates 50 ° 54 '  N , 11 ° 22'  E Coordinates: 50 ° 54 '  N , 11 ° 22'  E
rock Muschelkalk
(Tannrodaer Waldland and southeastern roof: red sandstone )
f1
p1
p5

Ilm-Saale- und Ohrdrufer Platte denotes the southeastern shell limestone framing of the Thuringian Basin between the Ohra near Ohrdruf in the west and the Ilm near Bad Sulza in the northeast. To the south-west it meets the Thuringian Forest , to the south the Paulinzellaer Vorland , to the south-east it extends to the Middle Saale valley of the Saale between Rudolstadt and Rothenstein , at Jena even east beyond it. According to the handbook of the natural spatial structure of Germany , it represents a main unit of the main unit group Thuringian Basin (with edge plates) .

Location and partial landscapes

The plate extends over the Thuringian districts of Gotha , Ilm-Kreis , Saalfeld-Rudolstadt , Saale-Orla-Kreis , Weimarer Land and the independent cities of Erfurt , Weimar and Jena. It is divided into different plates and segments by tectonic faults and river valleys, the main plates of which are the Ohrdrufer Platte (up to 518 m), the Reinsberge (up to 605 m), the Ilm-Saale-Platte (up to 548 m) and the Jenaer Scholle (up to 422 m). The part of the Jenaer Scholle located to the right of the Saale is divided into the distinctive individual ridges Wöllmisse (405 m) and Horseshoe (388 m) as well as some witness mountains and the Tautenburger forest . The red sandstone depression of the Tannroda woodland lies island-like within the Ilm-Saale-Platte on both sides of the Ilm between Tannroda and Bad Berka . A much smaller island of this type can be found further northwest on the Steigerwald , and there is also red sandstone on the southeast slope to the Saale.

While the Reinsberge and the mountain ranges in the eastern half of Jena are distinctly broken up into individual mountains, large parts of the main unit represent extensive plateaus that are only accessible by the z. Some of the river valleys are deeply deepened. In particular, the ascent from the Thuringian Basin is largely gentle.

Natural structure

Geological structure of the Thuringian Basin with the Triassic rocks Keuper (inside), Muschelkalk (edge ​​plates) and Buntsandstein (outer frame)

Rough breakdown

The Ilm-Saale- and Ohrdrufer Platte are divided as follows:

Fine-tuning

For the subdivision of the main unit Ilm-Saale- and Ohrdrufer Platte into the Ilm-Saale-Platte in the broader sense and the Ohrdrufer Platte in the broader sense , it is not the valley of the Ilm , which divides the unit to the northeast , but mainly the Hercynian , ie Eichenberg – Gotha – Saalfeld fault zone facing southeast . Nevertheless, the assignment of the southwestern witness mountains of the Ilm-Saale-Platte , the Willinger Berg and above all the Singer Berg is not uniformly regulated. Both extend the southeast facing ridge of the Reinsberge, which they resemble in relief, and lie southwest of the fault zone, but are separated from the actual ridge by the valley of the Wipfra or, in the case of the Singer, by the even deeper valley of the Ilm. The Willinger Berg is on one side, the Singer Berg almost completely enclosed by red sandstone, which is why they could also be assigned to the Paulinzella foothills as evacuated witness mountains .

The separation of the Jenaer Scholle from the Ilm-Saale-Platte in the narrower sense along the Schlotheim-Leuchtenburg fault zone is orographically clear at the Magdalaer Graben of the Magdel , but can be interpreted further south-east. The most obvious dividing line in terms of landscape is probably the route of the A 4 , which follows Leutra to the east, towards the Saale .

The following partial plates and segments can be identified internally from west to east:

Allocation according to TLUG

The Thuringian State Institute for Environment and Geology (TLUG) has its own Thuringia-internal structure The Natural Areas of Thuringia , within which, apart from border marginalities, almost the entire main unit is listed as the Ilm-Saale-Ohrdrufer Platte under the Muschelkalk-Platten and -ergländer n .

Only the Tannrodaer Waldland , which represents an independent unit there, and the red sandstone roofing of the Ilm-Saale slab towards the Saale, which is assigned to the Saale sandstone slab - both red sandstone hill countries, are not part of the TLUG unit . It should be noted that the units in the manual are always simply connected - which is why the island-like Tannrodaer Waldland can only be a sub- unit of the local main unit - while TLUG focuses on the categorization according to main rock and units can also be multi-part (as with the Saale sandstone slab the case).

Individual evidence

  1. ^ E. Meynen and J. Schmithüsen : Handbook of the natural spatial structure of Germany - Federal Institute for Regional Studies, Remagen / Bad Godesberg 1953–1962 (9 deliveries in 8 books, updated map 1: 1,000,000 with main units 1960)
  2. ↑ The mapping 1: 1,000,000 in the manual does not allow a clear assignment to one of the two main units; in the 6th delivery, the Große Kalmberg is listed as the highest mountain of the Ilm-Saale-Platte, but the Singer Berg is neither listed in the Paulinzellaer Vorland nor in the Ohrdrufer Platte / the Reinsbergen.
  3. ↑ Hydrogeological map of Thuringia by the Thuringian State Institute for Environment and Geology (PDF; 4.37 MB) ( Even finer maps are available for each district .) The numerous parallel Hercynian faults southeast of the Magdalaer Graben are particularly easy to recognize
  4. ^ Walter Hiekel, Frank Fritzlar, Andreas Nöllert and Werner Westhus: The natural spaces of Thuringia . Ed .: Thuringian State Institute for Environment and Geology (TLUG), Thuringian Ministry for Agriculture, Nature Conservation and Environment . 2004, ISSN  0863-2448 . → Natural area map of Thuringia (TLUG) - PDF; 260 kB → Maps by district (TLUG)

Web links

Commons : Ilm-Saale- und Ohrdrufer Platte  - Collection of images, videos and audio files