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File:Juranagelfluh Obermiozaen Tengener-Rinne Hondingen Schwaebische-Alb.jpg

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Deutsch: Besonders großes Exemplar eines „Jüngeren Juranagelfluhs“ in der „Tengener Rinne“ im Aufschluss eines Steinbruchs bei Hondingen (Blumberg), Hegaualb, Schwäbische Alb. Die Beschädigungen der Oberfläche sind Folgen von Stößen beim Gerölltransport

In der „Tengener Rinne“ wurden im Mittleren Miozän Massen von aus dem Norden (Schwarzwald, Albvorland und Schwäbische Albtafel) kommende Flussgerölle transportiert. Diese Rinne ist die größte von drei gewaltigen Urflüssen. Die Juranagelfluh-Ablagerungen sind der wichtigste geologische Beleg für Urflüsse aus dem Norden. Die Schüttung erfolgte zur Zeit der Oberen Süßwassermolasse (OSM). Die Schüttung der Gerölle war so gewaltig, dass sie auf einer ca. 30 km breiten Fläche abgelagert wurde. Schreiner, 1965, S. 328, schreibt: Es „kann die Gesamtmächtigkeit der Juranagelfluh am Hohenstoffeln mit 350 bis 380 m angenommen werden“.

Die Urflüsse transportierten ihre Wasser- und Geröllfracht in die prädanubische Graupensandrinne, in der sie große Schwemmkegel aufschütteten.

English: Giant cobble, of “Jüngere Juranagelfluh”, Middle Miocene, West-Swabian Alb. The damages on the cobble surface result from impacts during transport. This fluvial sediment came in chutes from the north (Black Forest, northern Alb foreland and Swabian Alb), associated with “Obere Süßwassermolasse” (Upper Freshwater Molasse).
The water and cobbles came in such tremendous quantities, they produced three giant chutes. The dominant being the “Tengen runnel”. The deposits piled up to 350 m high, covering a plain ca. 30 km wide. The chutes pored their water and sediment into the predanubian “Graupensandrinne”, forming huge alluvial fans.
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current16:33, 29 July 2018Thumbnail for version as of 16:33, 29 July 20181,800 × 1,200 (2.96 MB)Ustill (talk | contribs)User created page with UploadWizard

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