File:Gruchental Gefälleknick Schwäbische Alb.jpg

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English: knickpoint in river "Gruchen", tributary of the Lauchert, near Gammertingen, Swabian Alb. Like most Lauchert tributaries it fell dry already in Late Neogene.
The steep slope of the lower 2,3km of the valley, caused by episodic headward erosion, and the flat continuation behind the knickpoint are a measure of denudation of the terrain around the Lauchert since its tributaries fell dry.
Deutsch: "Gefälleknick" der "Gruchen", Nebenfluss der Oberen Lauchert, zwischen Mariaberg und "Bronnen (Gammertingen)", Schwäbische Alb. Hier floss einer der typischen Lauchert-Nebenflüsse, die schon im ausgehenden Tertiär trockengefallen sind.

Die gedachte Verlängerung des oberen Teils der Gruchen streicht etwa 55m über der heutigen Lauchert-Felssohle aus. Durch episodische, "rückschreitende Erosion" ist der untere Talteil steil eingeschnitten; nach 2,3km folgt ein Gefälleknick ab dem der obere Talteil muldenartig flach weiterläuft.

Dies ist ein Maß für die Eintiefung der Lauchert und die Denudation der Flusslandschaft seit Trockenfallens der Gruchen. Das Reliefniveau wurde als "Niveau III" ins Pliozän-Pleistozän (~1,8-3Ma ) datiert. Vgl. Th. Abel, Untersuchungen zur Genese..., Tü., 2003.
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