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

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Deutsch: Aufschluss in einem Steinbruchs bei Hondingen (Blumberg), Hegaualb. Hier ist das mittelmiozäne Flussgeröll, „Jüngere Juranagelfluh“, aufgeschlossen. In der so genannten „Tengener Rinne“ wurden Massen von Flussgeröllen transportiert. Diese Rinne ist die größte von drei gewaltigen Urflüssen aus dem Schwarzwald.

Das Gestein ist der wichtigste geologische Beleg für Schüttungen zur Zeit der Oberen Süßwassermolasse (OSM) aus dem Norden (Schwarzwald, Albvorland und Plateau der Schwäbischen Alb). Die Schüttung der wohlgerundeten, teilweise 30 cm großen, Gerölle war so gewaltig, dass die Rinnen aufgefüllt wurden und sich auf einer ca. 30 km breite Fläche ablagerten. „Es „kann die Gesamtmächtigkeit der Juranagelfluh am Hohenstoffeln mit 350 bis 380 m angenommen werden“. Schreiner, 1965, S. 328. Vgl. auch das Foto Image:Juranagelfluh_Obermiozaen_Tengener-Rinne_Riedoeschingen_Schwaebische-Alb.jpg, das zeigt, wie auch heute noch Äcker mit diesen Geröllen übersät sind.

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

English: “Jüngere Juranagelfluh” of Miocene age in a quarry in Hondingen, village northeast of Blumberg West-Swabian Alb. The cobbles are a fluvial sediment coming from the northern foreland, the Black Forest and from the plateau of the Swabian Alb. They are associated with the alpine “Obere Süßwassermolasse” (Upper Freshwater Molasse). The cobbles came in such tremendous quantities, they produced three giant “runnels” (the dominant being the “Tengen runnel”) and pored their waters and cobble deposits up to 350 m high. Farming land is covered with it even today, mind the photo Image:Juranagelfluh_Obermiozaen_Tengener-Rinne_Riedoeschingen_Schwaebische-Alb.jpg).
These ur-rivers pored their water into the “Graupensanrinne”, there forming huge alluvial fans.
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current16:25, 29 July 2018Thumbnail for version as of 16:25, 29 July 20181,800 × 1,200 (2.69 MB)Ustill (talk | contribs)User created page with UploadWizard

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